diff --git a/.gcloudignore b/.gcloudignore
new file mode 100644
index 0000000..ef2ea2e
--- /dev/null
+++ b/.gcloudignore
@@ -0,0 +1,15 @@
+# This file specifies files that are *not* uploaded to Google Cloud Platform
+# using gcloud. It follows the same syntax as .gitignore, with the addition of
+# "#!include" directives (which insert the entries of the given .gitignore-style
+# file at that point).
+#
+# For more information, run:
+#   $ gcloud topic gcloudignore
+#
+.gcloudignore
+#!include:.gitignore
+
+# Don't bother uploading files not needed to generate a database.
+experiments
+minitests
+vagrant
diff --git a/.gitignore b/.gitignore
index 05e207b..28f1075 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 /build/
 .Xil
-database/*
+# Ignore database directories _except_ for their settings
+database/*/*
+!database/*/settings.sh
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..a254495
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,12 @@
+ARG DEV_ENV_IMAGE
+
+FROM ${DEV_ENV_IMAGE} AS db_builder
+ARG NUM_PARALLEL_JOBS=1
+
+COPY . /source
+RUN cd /source && make -j${NUM_PARALLEL_JOBS} database
+RUN find /source/database -mindepth 1 -maxdepth 1 -type d -exec /source/htmlgen/htmlgen.py --settings={}/settings.sh --output=/output/html \;
+RUN mkdir -p /output/raw && find /source/database -mindepth 1 -maxdepth 1 -type d -exec cp -R {} /output/raw \;
+
+FROM nginx:alpine
+COPY --from=db_builder /output /usr/share/nginx/html
diff --git a/Makefile b/Makefile
index 297b666..2028b5d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,21 @@
-JOBS ?= $(shell nproc)
-JOBS ?= 2
 CLANG_FORMAT ?= clang-format
 
-go:
+.PHONY: database format clean
+
+build:
 	git submodule update --init --recursive
 	mkdir -p build
-	cd build; cmake ..; make -j$(JOBS)
+	cd build; cmake ..; $(MAKE)
+
+database: build
+	$(MAKE) -C $@
 
 format:
 	find . -name \*.cc -and -not -path './third_party/*' -and -not -path './.git/*' -exec $(CLANG_FORMAT) -style=file -i {} \;
 	find . -name \*.h -and -not -path './third_party/*' -and -not -path './.git/*' -exec $(CLANG_FORMAT) -style=file -i {} \;
 	find . -name \*.py -and -not -path './third_party/*' -and -not -path './.git/*' -exec yapf -p -i {} \;
+
+clean:
+	$(MAKE) -C database clean
+	$(MAKE) -C fuzzers clean
+	rm -rf build
diff --git a/cloudbuild.yaml b/cloudbuild.yaml
new file mode 100644
index 0000000..c3f12bc
--- /dev/null
+++ b/cloudbuild.yaml
@@ -0,0 +1,21 @@
+steps:
+- name: 'gcr.io/cloud-builders/docker'
+  args:
+    - 'build'
+    - '--build-arg'
+    - 'DEV_ENV_IMAGE=${_DEV_ENV_IMAGE}'
+    - '--build-arg'
+    - 'NUM_PARALLEL_JOBS=${_NUM_CPUS}'
+    - '-t'
+    - '${_GCR_ZONE}/$PROJECT_ID/${_IMAGE_NAME}:${TAG_NAME}'
+    - '.'
+options:
+  disk_size_gb: 1000
+  machine_type: N1_HIGHCPU_32
+timeout: '21600s'
+substitutions:
+  _GCR_ZONE: 'gcr.io'
+  _IMAGE_NAME: 'prjxray-db'
+  _NUM_CPUS: '16'
+images:
+  - '${_GCR_ZONE}/$PROJECT_ID/${_IMAGE_NAME}:${TAG_NAME}'
diff --git a/database/Makefile b/database/Makefile
new file mode 100644
index 0000000..99fab40
--- /dev/null
+++ b/database/Makefile
@@ -0,0 +1,10 @@
+.NOTPARALLEL:
+
+SUBDIRS := $(patsubst %/,%, $(wildcard */))
+
+.PHONY: $(SUBDIRS)
+
+$(MAKECMDGOALS): $(SUBDIRS)
+
+$(SUBDIRS):
+	$(MAKE) -C $@ -f ../Makefile.database $(MAKECMDGOALS)
diff --git a/database/Makefile.database b/database/Makefile.database
new file mode 100644
index 0000000..2e40796
--- /dev/null
+++ b/database/Makefile.database
@@ -0,0 +1,15 @@
+.PHONY: all clean
+
+all: tilegrid.json
+
+# Small dance to say that there is a single recipe that is run once to generate
+# multiple files.
+tileconn.json tilegrid.json: fuzzers
+.INTERMEDIATE: fuzzers
+fuzzers: SHELL:=/bin/bash
+fuzzers: settings.sh
+	source settings.sh && $(MAKE) -C ../../fuzzers all
+
+clean:
+	rm -f *.db tileconn.json tilegrid.json *.yaml
+	rm -rf html
diff --git a/docs/.gitignore b/docs/.gitignore
new file mode 100644
index 0000000..e35d885
--- /dev/null
+++ b/docs/.gitignore
@@ -0,0 +1 @@
+_build
diff --git a/docs/Makefile b/docs/Makefile
new file mode 100644
index 0000000..b52c668
--- /dev/null
+++ b/docs/Makefile
@@ -0,0 +1,24 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SPHINXAUTOBUILD   = sphinx-autobuild
+SPHINXPROJ    = ProjectX-Ray
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+livehtml:
+	@$(SPHINXAUTOBUILD) -b html --ignore \*.swp --ignore \*~ $(SPHINXOPTS) "$(SOURCEDIR)" "$(BUILDDIR)/html"
+
+.PHONY: help livereload Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
diff --git a/docs/architecture/bitstream_format.rst b/docs/architecture/bitstream_format.rst
new file mode 100644
index 0000000..5c74fb2
--- /dev/null
+++ b/docs/architecture/bitstream_format.rst
@@ -0,0 +1,43 @@
+Bitstream format
+================
+
+.. todo::
+  Expand on rough notes
+
+* Specific byte pattern at beginning of file to allow hardware to determine
+  width of bus providing configuration data.
+* Rest of file is 32-bit big-endian words
+* All data before 32-bit synchronization word (0xAA995566) is ignored by
+  configuration state machine
+* Packetized format used to perform register reads/writes
+  * Three packet header types
+
+    * Type 0 packets exist only when performing zero-fill between rows
+    * Type 1 used for writes up to 4096 words
+    * Type 2 expands word count field to 27 bits by omitting register address
+    * Type 2 must always be proceeded by Type 1 which sets register address
+
+  * NOP packets are used for inserting required delays
+  * Most registers only accept 1 word of data
+  * Allowed register operations depends on interface used to send packets
+
+    * Writing LOUT via JTAG is treated as a bad command
+    * Single-frame FDRI writes via JTAG fail
+
+* CRC
+
+  * Calculated automatically from writes: register address and data written
+  * Expected value is written to CRC register
+  * If there is a mismatch, error is flagged in status register
+  * Writes to CRC register can be safely removed from a bitstream
+  * Alternatively, replace with write to command register to reset calculated
+    CRC value
+
+* Xilinx BIT header
+
+  * Additional information about how bitstream was generated
+  * Unofficially documented at
+    http://www.fpga-faq.com/FAQ_Pages/0026_Tell_me_about_bit_files.htm
+  * Really does require NULL-terminated Pascal strings
+  * Having this header is the distinction between .bin and .bit in Vivado
+  * Is ignored entirely by devices
diff --git a/docs/architecture/configuration.rst b/docs/architecture/configuration.rst
new file mode 100644
index 0000000..e75174f
--- /dev/null
+++ b/docs/architecture/configuration.rst
@@ -0,0 +1,130 @@
+Configuration
+=============
+
+Within an FPGA, various memories (latches, block RAMs, distributed RAMs)
+contain the state of signal routing, :term:`BEL` configuration, and runtime
+storage. Configuration is the process of loading an initial state into all of
+these memories both to define the intended logic operations as well as set
+initial data for runtime memories. Note that the same mechanisms used for
+configuration are also capable of reading out the active state of these
+memories as well. This can be used to examine the contents of a block RAM or
+other memory at any point in the device's operation.
+
+Addressing
+----------------
+As described in :ref:`architecture_overview-label`, 7-Series FPGAs are constructed
+out of :term:`tiles <tile>` organized into :term:`clock domains <clock
+domain>`. Each tile contains a set of :term:`BELs <BEL>` and the memories used
+to configure them. Uniquely addressing each of these memories
+involves first identifying the :term:`horizontal clock row`, then the tile within
+that row, and finally the specific bit within the tile.
+
+:term:`Horizontal clock row` addressing follows the hierarchical structure described
+in :ref:`architecture_overview-label` with a single bit used to indicate top or bottom half
+and a 5-bit integer to encode the row number. Within the row, tiles are connected to
+one or more configuration busses depending on the type of tile and what configuration
+memories it contains. These busses are identified by a 3-bit integer:
+
++---------+-------------------+---------------------+
+| Address | Name              | Connected tile type |
++=========+===================+=====================+
+| 000     | CLB, I/O, CLB     | Interconnect (INT)  |
++---------+-------------------+---------------------+
+| 001     | Block RAM content | Block RAM (BRAM)    |
++---------+-------------------+---------------------+
+| 010     | CFG_CLB           | ???                 |
++---------+-------------------+---------------------+
+
+Within each bus, the connected tiles are organized into columns. A column roughly
+corresponds to a physical vertical line of tiles perpendicular to and centered over
+the horizontal clock row. Each column contains varying amounts of configuration data
+depending on the types of tiles attached to that column. Regardless of the amount,
+a column's configuration data is organized into a multiple of :term:`frames <frame>`.
+Each frame consists of 101 words with 100 words for the connected tiles and 1 word for
+the horizontal clock row. The 7-bit address used to identify a specific frame within
+the column is called the minor address.
+
+Putting all these pieces together, a 32-bit frame address is constructed:
+
++-----------------+-------+
+| Field           | Bits  |
++=================+=======+
+| Reserved        | 31:26 |
++-----------------+-------+
+| Bus             | 25:23 |
++-----------------+-------+
+| Top/Bottom Half | 22    |
++-----------------+-------+
+| Row             | 21:17 |
++-----------------+-------+
+| Column          | 16:7  |
++-----------------+-------+
+| Minor           | 6:0   |
++-----------------+-------+
+
+CLB, I/O, CLB
+^^^^^^^^^^^^^
+
+Columns on this bus are comprised of 50 directly-attached interconnect tiles with various
+kinds of tiles connected behind them. Frames are striped across the interconnect tiles
+with each tile receiving 2 words out of the frame. The number of frames in a column
+depends on the type of tiles connected behind the interconnect. For example, interconnect
+tiles always have 26 frames and a CLBL tile has an additional 12 frames so a column of CLBs
+will have 36 frames.
+
+Block RAM content
+^^^^^^^^^^^^^^^^^
+
+As the name says, this bus provides access to the Block RAM contents. Block RAM configuration
+data is accessed via the CLB, I/O, CLB bus. The mapping of frame words to memory locations is
+not currently understood.
+
+CFG_CLB
+^^^^^^^
+
+While mentioned in a few places, this bus type has not been seen in any bitstreams for Artix7
+so far.
+
+Loading sequence
+----------------------
+
+.. todo::
+
+  Expand on these rough notes.
+
+* Device is configured via a state machine controlled via a set of registers
+* CRC of register writes is checked against expected values to verify data
+  integrity during transmission.
+* Before writing frame data:
+
+  * IDCODE for configuration's target device is checked against actual device
+  * Watchdog timer is disabled
+  * Start-up sequence clock is selected and configured
+  * Start-up signal assertion timing is configured
+  * Interconnect is placed into Hi-Z state
+
+* Data is then written by:
+
+  * Loading a starting address
+  * Selecting the write configuration command
+  * Writing configuration data to data input register
+
+    * Writes must be in multiples of the frame size
+    * Multi-frame writes trigger autoincrementing of the frame address
+    * Autoincrement can be disabled via bit in COR1 register.
+    * At the end of a row, 2 frames of zeros must be inserted before data for the next row.
+
+* After the write has finished, the device is restarted by:
+
+  * Strobing a signal to activate IOB/CLB configuration flip-flops
+  * Reactivate interconnect
+  * Arms start-up sequence to run after desync
+  * Desynchronizes the device from the configuration port
+
+* Status register provides detail of start-up phases and which signals are asserted
+
+Other
+-----
+* ECC of frame data is contained in word 50 alongside horizontal clock row configuration
+* Loading will succeed even with incorrect ECC data
+* ECC is primarily used for runtime bit-flip detection
diff --git a/docs/architecture/glossary.rst b/docs/architecture/glossary.rst
new file mode 100644
index 0000000..ef29cec
--- /dev/null
+++ b/docs/architecture/glossary.rst
@@ -0,0 +1,72 @@
+Glossary
+========================
+
+.. glossary::
+
+  basic element
+  BEL
+  basic logic element
+  BLE
+    For example a LUT5, LUT6, CARRY4, or MUX, but not PIPs.
+
+    BELs come in two types:
+
+    * Basic BEL - A logic unit which does things.
+    * Routing BEL - A unit which is statically configured at the routing time.
+     
+
+  bitstream
+    Binary data that is directly loaded into an FPGA to perform configuration.
+    Contains configuration :term:`frames <frame>` as well as programming
+    sequences and other commands required to load and activate same.
+
+  clock domain
+    Portion of a :term:`horizontal clock row` to one side of the global clock
+    spine. Often refers to :term:`tiles <tile>` that are associated with these
+    clocks.
+
+  column
+    Collection of :term:`tiles <tile>` physically organized as a vertical line.
+
+  configurable logic block
+  CLB
+    Basic building block of logic. 
+
+  frame
+    Fundamental unit of configuration data consisting of 101 :term:`words <word>`.
+
+  half
+    Portion of a device defined by a virtual line dividing the two sets of global
+    clock buffers present in a device. The two halves are simply referred to as
+    the top and bottom halves.
+
+  node
+    Collection of :term:`wires <wire>` spanning one or more tiles.
+
+  programmable interconnect point
+  PIP
+    Connection point between two wires in a tile that may be enabled or
+    disabled by the configuration.
+
+  horizontal clock row
+    Portion of a device including 12 horizontal clocks and the 50 interconnect
+    and function tiles associated with them. A :term:`half` contains one or
+    more horizontal clock rows and each half may have a different number of
+    rows.
+
+  site
+    Portion of a tile where :term:`BELs <BEL>` can be placed.  :term:`Slices
+    <slice>` in a :term:`CLB` tile are sites.
+
+  slice
+    Portion of a :term:`CLB` tile that contains :term:`BELs <BEL>`.
+
+  tile
+    Fundamental unit of physical structure containing a single type of
+    resource or function.
+
+  wire
+    Physical wire within a :term:`tile`.
+
+  word
+    32-bits stored in big-endian order. Fundamental unit of :term:`bitstream` format. 
diff --git a/docs/architecture/overview.rst b/docs/architecture/overview.rst
new file mode 100644
index 0000000..ec66cfb
--- /dev/null
+++ b/docs/architecture/overview.rst
@@ -0,0 +1,33 @@
+.. _architecture_overview-label:
+
+Overview
+========
+
+.. todo:: add diagrams.
+
+Xilinx 7-Series architecture utilizes a hierarchical design of chainable
+structures to scale across the Spartan, Artix, Kintex, and Virtex product
+lines.  This documentation focuses on the Artix and Kintex devices and omits
+some concepts introduced in Virtex devices.
+
+At the top-level, 7-Series devices are divided into two :term:`halves <half>`
+by a virtual horizontal line separating two sets of global clock buffers
+(BUFGs). While global clocks can be connected such that they span both sets of
+BUFGs, the two halves defined by this division are treated as separate entities
+as related to configuration. The halves are referred to simply as the top and
+bottom halves.
+
+Each half is next divided vertically into one or more :term:`horizontal clock
+rows <horizontal clock row>`, numbered outward from the global clock buffer
+dividing line. Each horizontal clock row contains 12 clock lines that extend
+across the device perpendicular to the global clock spine.  Similar to the
+global clock spine, each horizontal clock row is divided into two halves by two
+sets of horizontal clock buffers (BUFHs), one on each side of the global clock
+spine, yielding two :term:`clock domains <clock domain>`.  Horizontal clocks
+may be used within a single clock domain, connected to span both clock domains
+in a horizontal clock row, or connected to global clocks.
+
+Clock domains have a fixed height of 50 :term:`interconnect tiles
+<interconnect tile>` centered around the horizontal clock lines (25 above, 25
+below). Various function tiles, such as :term:`CLBs <CLB>`, are attached to interconnect
+tiles.
diff --git a/docs/conf.py b/docs/conf.py
new file mode 100644
index 0000000..9d14b72
--- /dev/null
+++ b/docs/conf.py
@@ -0,0 +1,179 @@
+# -*- coding: utf-8 -*-
+#
+# Project X-Ray documentation build configuration file, created by
+# sphinx-quickstart on Mon Feb  5 11:04:37 2018.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+import os
+import re
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.imgmath', 'sphinx.ext.autodoc', 'sphinx.ext.doctest',
+    'sphinx.ext.autosummary', 'sphinx.ext.napoleon', 'sphinx.ext.todo'
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = u'Project X-Ray'
+copyright = u'2018, SymbiFlow Team'
+author = u'SymbiFlow Team'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The full version, including alpha/beta/rc tags.
+release = re.sub('^v', '', os.popen('git describe ').read().strip())
+# The short X.Y version.
+version = release
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This patterns also effect to html_static_path and html_extra_path
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = True
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+# html_theme_options = {}
+
+# Enable github links when not on readthedocs
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+if not on_rtd:
+    html_context = {
+        "display_github": True,  # Integrate GitHub
+        "github_user": "symbiflow",  # Username
+        "github_repo": "prjxray",  # Repo name
+        "github_version": "master",  # Version
+        "conf_py_path": "/doc/",
+    }
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# This is required for the alabaster theme
+# refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars
+html_sidebars = {
+    '**': [
+        'relations.html',  # needs 'show_related': True theme option to display
+        'searchbox.html',
+    ]
+}
+
+# -- Options for HTMLHelp output ------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'prjxray'
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+    # The paper size ('letterpaper' or 'a4paper').
+    #
+    # 'papersize': 'letterpaper',
+
+    # The font size ('10pt', '11pt' or '12pt').
+    #
+    # 'pointsize': '10pt',
+
+    # Additional stuff for the LaTeX preamble.
+    #
+    # 'preamble': '',
+
+    # Latex figure (float) alignment
+    #
+    # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+    (
+        master_doc, 'ProjectX-Ray.tex', u'Project X-Ray Documentation',
+        u'SymbiFlow Team', 'manual'),
+]
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'projectx-ray', u'Project X-Ray Documentation', [author], 1)
+]
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+    (
+        master_doc, 'ProjectX-Ray', u'Project X-Ray Documentation', author,
+        'ProjectX-Ray', 'One line description of project.', 'Miscellaneous'),
+]
+
+# Example configuration for intersphinx: refer to the Python standard library.
+intersphinx_mapping = {'https://docs.python.org/': None}
diff --git a/docs/index.rst b/docs/index.rst
new file mode 100644
index 0000000..81041af
--- /dev/null
+++ b/docs/index.rst
@@ -0,0 +1,23 @@
+.. Project X-Ray documentation master file, created by
+   sphinx-quickstart on Mon Feb  5 11:04:37 2018.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to Project X-Ray
+=========================================
+
+`Project X-Ray`_ documents the `Xilinx`_ 7-Series FPGA architecture to enable
+development of open-source tools.  Our goal is to provide sufficient information
+to develop a free and open Verilog to bitstream toolchain for these devices.
+
+.. _Project X-Ray: https://github.com/SymbiFlow/prjxray
+.. _Xilinx: http://www.xilinx.com/
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Xilinx 7-series Architecture
+
+   architecture/overview
+   architecture/configuration
+   architecture/bitstream_format
+   architecture/glossary
diff --git a/fuzzers/005-tilegrid/README.txt b/fuzzers/005-tilegrid/README.md
similarity index 100%
rename from fuzzers/005-tilegrid/README.txt
rename to fuzzers/005-tilegrid/README.md
diff --git a/fuzzers/011-ffconfig/README.txt b/fuzzers/011-ffconfig/README.md
similarity index 100%
rename from fuzzers/011-ffconfig/README.txt
rename to fuzzers/011-ffconfig/README.md
diff --git a/fuzzers/012-clbn5ffmux/README.txt b/fuzzers/012-clbn5ffmux/README.md
similarity index 100%
rename from fuzzers/012-clbn5ffmux/README.txt
rename to fuzzers/012-clbn5ffmux/README.md
diff --git a/fuzzers/012-clbn5ffmux/generate.py b/fuzzers/012-clbn5ffmux/generate.py
index 6c44af1..e2e5a7d 100644
--- a/fuzzers/012-clbn5ffmux/generate.py
+++ b/fuzzers/012-clbn5ffmux/generate.py
@@ -26,7 +26,7 @@
         # Theory: there is one bit for each mux positon
         # In each config 3 muxes are in one position, other 3 are in another
         inv = int(i == n)
-        segmk.addtag(loc, "%c5FF.MUX.A" % which, def_a ^ inv)
-        segmk.addtag(loc, "%c5FF.MUX.B" % which, 1 ^ def_a ^ inv)
+        segmk.addtag(loc, "%c5FFMUX.IN_A" % which, def_a ^ inv)
+        segmk.addtag(loc, "%c5FFMUX.IN_B" % which, 1 ^ def_a ^ inv)
 segmk.compile()
 segmk.write()
diff --git a/fuzzers/013-clbncy0/README.txt b/fuzzers/013-clbncy0/README.md
similarity index 100%
rename from fuzzers/013-clbncy0/README.txt
rename to fuzzers/013-clbncy0/README.md
diff --git a/fuzzers/014-ffsrcemux/README.txt b/fuzzers/014-ffsrcemux/README.md
similarity index 100%
rename from fuzzers/014-ffsrcemux/README.txt
rename to fuzzers/014-ffsrcemux/README.md
diff --git a/fuzzers/015-clbnffmux/README.md b/fuzzers/015-clbnffmux/README.md
new file mode 100644
index 0000000..f67ed3b
--- /dev/null
+++ b/fuzzers/015-clbnffmux/README.md
@@ -0,0 +1,42 @@
+Purpose:
+Document nFFMUX family of CLB muxes
+
+Algorithm:
+
+Outcome:
+
+
+CLB.SLICE_X0.AFFMUX.B0 30_00
+CLB.SLICE_X0.AFFMUX.B1 30_01
+CLB.SLICE_X0.AFFMUX.B2 30_02
+CLB.SLICE_X0.AFFMUX.B3 30_03
+CLB.SLICE_X0.BFFMUX.B0 30_27
+CLB.SLICE_X0.BFFMUX.B1 30_26
+CLB.SLICE_X0.BFFMUX.B2 30_25
+CLB.SLICE_X0.BFFMUX.B3 30_24
+CLB.SLICE_X0.CFFMUX.B0 30_35
+CLB.SLICE_X0.CFFMUX.B1 30_36
+CLB.SLICE_X0.CFFMUX.B2 30_37
+CLB.SLICE_X0.CFFMUX.B3 30_38
+CLB.SLICE_X0.DFFMUX.B0 30_62
+CLB.SLICE_X0.DFFMUX.B1 30_61
+CLB.SLICE_X0.DFFMUX.B2 30_60
+CLB.SLICE_X0.DFFMUX.B3 30_59
+CLB.SLICE_X1.AFFMUX.B0 31_00
+CLB.SLICE_X1.AFFMUX.B1 31_01
+CLB.SLICE_X1.AFFMUX.B2 31_02
+CLB.SLICE_X1.AFFMUX.B3 30_04
+CLB.SLICE_X1.BFFMUX.B0 31_25
+CLB.SLICE_X1.BFFMUX.B1 31_27
+CLB.SLICE_X1.BFFMUX.B2 31_26
+CLB.SLICE_X1.BFFMUX.B3 31_24
+CLB.SLICE_X1.CFFMUX.B0 31_35
+CLB.SLICE_X1.CFFMUX.B1 31_38
+CLB.SLICE_X1.CFFMUX.B2 31_37
+CLB.SLICE_X1.CFFMUX.B3 31_36
+CLB.SLICE_X1.DFFMUX.B0 30_58
+CLB.SLICE_X1.DFFMUX.B1 31_61
+CLB.SLICE_X1.DFFMUX.B2 31_62
+CLB.SLICE_X1.DFFMUX.B3 31_60
+
+
diff --git a/fuzzers/015-clbnffmux/README.txt b/fuzzers/015-clbnffmux/README.txt
deleted file mode 100644
index 820fcf3..0000000
--- a/fuzzers/015-clbnffmux/README.txt
+++ /dev/null
@@ -1,42 +0,0 @@
-Purpose:
-Document AFFMUX family of CLB muxes
-
-Algorithm:
-
-Outcome:
-
-
-CLB.SLICE_X0.AFF.DMUX.B0 30_00
-CLB.SLICE_X0.AFF.DMUX.B1 30_01
-CLB.SLICE_X0.AFF.DMUX.B2 30_02
-CLB.SLICE_X0.AFF.DMUX.B3 30_03
-CLB.SLICE_X0.BFF.DMUX.B0 30_27
-CLB.SLICE_X0.BFF.DMUX.B1 30_26
-CLB.SLICE_X0.BFF.DMUX.B2 30_25
-CLB.SLICE_X0.BFF.DMUX.B3 30_24
-CLB.SLICE_X0.CFF.DMUX.B0 30_35
-CLB.SLICE_X0.CFF.DMUX.B1 30_36
-CLB.SLICE_X0.CFF.DMUX.B2 30_37
-CLB.SLICE_X0.CFF.DMUX.B3 30_38
-CLB.SLICE_X0.DFF.DMUX.B0 30_62
-CLB.SLICE_X0.DFF.DMUX.B1 30_61
-CLB.SLICE_X0.DFF.DMUX.B2 30_60
-CLB.SLICE_X0.DFF.DMUX.B3 30_59
-CLB.SLICE_X1.AFF.DMUX.B0 31_00
-CLB.SLICE_X1.AFF.DMUX.B1 31_01
-CLB.SLICE_X1.AFF.DMUX.B2 31_02
-CLB.SLICE_X1.AFF.DMUX.B3 30_04
-CLB.SLICE_X1.BFF.DMUX.B0 31_25
-CLB.SLICE_X1.BFF.DMUX.B1 31_27
-CLB.SLICE_X1.BFF.DMUX.B2 31_26
-CLB.SLICE_X1.BFF.DMUX.B3 31_24
-CLB.SLICE_X1.CFF.DMUX.B0 31_35
-CLB.SLICE_X1.CFF.DMUX.B1 31_38
-CLB.SLICE_X1.CFF.DMUX.B2 31_37
-CLB.SLICE_X1.CFF.DMUX.B3 31_36
-CLB.SLICE_X1.DFF.DMUX.B0 30_58
-CLB.SLICE_X1.DFF.DMUX.B1 31_61
-CLB.SLICE_X1.DFF.DMUX.B2 31_62
-CLB.SLICE_X1.DFF.DMUX.B3 31_60
-
-
diff --git a/fuzzers/015-clbnffmux/generate.py b/fuzzers/015-clbnffmux/generate.py
index 38fd2a8..79b4991 100644
--- a/fuzzers/015-clbnffmux/generate.py
+++ b/fuzzers/015-clbnffmux/generate.py
@@ -52,7 +52,7 @@
         src = which + "X"
 
     # add the 1-tag for this connection
-    tag = "%sFF.DMUX.%s" % (which, src)
+    tag = "%sFFMUX.%s" % (which, src)
     segmk.addtag(loc, tag, 1)
 
     # remove this MUX from the cache, preventing generation of 0-tags for this MUX
@@ -65,7 +65,7 @@
             if src == "F7" and which not in "AC": continue
             if src == "F8" and which not in "B": continue
             if src == "AX": src = which + "X"
-            tag = "%sFF.DMUX.%s" % (which, src)
+            tag = "%sFFMUX.%s" % (which, src)
             segmk.addtag(loc, tag, 0)
 
 
diff --git a/fuzzers/016-clbnoutmux/README.md b/fuzzers/016-clbnoutmux/README.md
new file mode 100644
index 0000000..d0e3161
--- /dev/null
+++ b/fuzzers/016-clbnoutmux/README.md
@@ -0,0 +1,52 @@
+Purpose:
+Document nOUTMUX family of CLB muxes
+TODO: document O6
+
+Algorithm:
+
+Outcome:
+
+CLB.SLICE_X0.AOUTMUX.B0 30_11
+CLB.SLICE_X0.AOUTMUX.B1 30_08
+CLB.SLICE_X0.AOUTMUX.B2 30_06
+CLB.SLICE_X0.AOUTMUX.B3 30_07
+CLB.SLICE_X0.BOUTMUX.B0 30_20
+CLB.SLICE_X0.BOUTMUX.B1 30_21
+CLB.SLICE_X0.BOUTMUX.B2 30_22
+CLB.SLICE_X0.BOUTMUX.B3 30_23
+CLB.SLICE_X0.COUTMUX.B0 30_45
+CLB.SLICE_X0.COUTMUX.B1 30_44
+CLB.SLICE_X0.COUTMUX.B2 30_40
+CLB.SLICE_X0.COUTMUX.B3 30_43
+CLB.SLICE_X0.DOUTMUX.B0 30_56
+CLB.SLICE_X0.DOUTMUX.B1 30_51
+CLB.SLICE_X0.DOUTMUX.B2 30_52
+CLB.SLICE_X0.DOUTMUX.B3 30_57
+CLB.SLICE_X1.AOUTMUX.B0 31_09
+CLB.SLICE_X1.AOUTMUX.B1 31_07
+CLB.SLICE_X1.AOUTMUX.B2 31_10
+CLB.SLICE_X1.AOUTMUX.B3 30_05
+CLB.SLICE_X1.BOUTMUX.B0 31_20
+CLB.SLICE_X1.BOUTMUX.B1 30_28
+CLB.SLICE_X1.BOUTMUX.B2 31_21
+CLB.SLICE_X1.BOUTMUX.B3 30_29
+CLB.SLICE_X1.COUTMUX.B0 31_43
+CLB.SLICE_X1.COUTMUX.B1 30_42
+CLB.SLICE_X1.COUTMUX.B2 31_40
+CLB.SLICE_X1.COUTMUX.B3 30_41
+CLB.SLICE_X1.DOUTMUX.B0 31_56
+CLB.SLICE_X1.DOUTMUX.B1 30_53
+CLB.SLICE_X1.DOUTMUX.B2 31_57
+CLB.SLICE_X1.DOUTMUX.B3 31_53
+
+
+From manual O6 testing
+30_11   X0 AOUTMUX O6
+30_20   X0 BOUTMUX O6
+30_45   X0 COUTMUX O6
+30_56   X0 DOUTMUX O6
+31_09   X1 AOUTMUX O6
+31_20   X1 BOUTMUX O6
+31_43   X1 COUTMUX O6
+31_56   X1 DOUTMUX O6
+
diff --git a/fuzzers/016-clbnoutmux/README.txt b/fuzzers/016-clbnoutmux/README.txt
deleted file mode 100644
index 6bcb808..0000000
--- a/fuzzers/016-clbnoutmux/README.txt
+++ /dev/null
@@ -1,52 +0,0 @@
-Purpose:
-Document AOUTMUX family of CLB muxes
-TODO: document O6
-
-Algorithm:
-
-Outcome:
-
-CLB.SLICE_X0.AMUX.B0 30_11
-CLB.SLICE_X0.AMUX.B1 30_08
-CLB.SLICE_X0.AMUX.B2 30_06
-CLB.SLICE_X0.AMUX.B3 30_07
-CLB.SLICE_X0.BMUX.B0 30_20
-CLB.SLICE_X0.BMUX.B1 30_21
-CLB.SLICE_X0.BMUX.B2 30_22
-CLB.SLICE_X0.BMUX.B3 30_23
-CLB.SLICE_X0.CMUX.B0 30_45
-CLB.SLICE_X0.CMUX.B1 30_44
-CLB.SLICE_X0.CMUX.B2 30_40
-CLB.SLICE_X0.CMUX.B3 30_43
-CLB.SLICE_X0.DMUX.B0 30_56
-CLB.SLICE_X0.DMUX.B1 30_51
-CLB.SLICE_X0.DMUX.B2 30_52
-CLB.SLICE_X0.DMUX.B3 30_57
-CLB.SLICE_X1.AMUX.B0 31_09
-CLB.SLICE_X1.AMUX.B1 31_07
-CLB.SLICE_X1.AMUX.B2 31_10
-CLB.SLICE_X1.AMUX.B3 30_05
-CLB.SLICE_X1.BMUX.B0 31_20
-CLB.SLICE_X1.BMUX.B1 30_28
-CLB.SLICE_X1.BMUX.B2 31_21
-CLB.SLICE_X1.BMUX.B3 30_29
-CLB.SLICE_X1.CMUX.B0 31_43
-CLB.SLICE_X1.CMUX.B1 30_42
-CLB.SLICE_X1.CMUX.B2 31_40
-CLB.SLICE_X1.CMUX.B3 30_41
-CLB.SLICE_X1.DMUX.B0 31_56
-CLB.SLICE_X1.DMUX.B1 30_53
-CLB.SLICE_X1.DMUX.B2 31_57
-CLB.SLICE_X1.DMUX.B3 31_53
-
-
-From manual O6 testing
-30_11   X0 AOUTMUX O6
-30_20   X0 BOUTMUX O6
-30_45   X0 COUTMUX O6
-30_56   X0 DOUTMUX O6
-31_09   X1 AOUTMUX O6
-31_20   X1 BOUTMUX O6
-31_43   X1 COUTMUX O6
-31_56   X1 DOUTMUX O6
-
diff --git a/fuzzers/016-clbnoutmux/generate.py b/fuzzers/016-clbnoutmux/generate.py
index 7c8dda1..ede555f 100644
--- a/fuzzers/016-clbnoutmux/generate.py
+++ b/fuzzers/016-clbnoutmux/generate.py
@@ -52,7 +52,7 @@
         src = which + "5Q"
 
     # add the 1-tag for this connection
-    tag = "%sMUX.%s" % (which, src)
+    tag = "%sOUTMUX.%s" % (which, src)
     segmk.addtag(loc, tag, 1)
 
     # remove this MUX from the cache, preventing generation of 0-tags for this MUX
@@ -65,7 +65,7 @@
             if src == "F7" and which not in "AC": continue
             if src == "F8" and which not in "B": continue
             if src == "5Q": src = which + "5Q"
-            tag = "%sMUX.%s" % (which, src)
+            tag = "%sOUTMUX.%s" % (which, src)
             segmk.addtag(loc, tag, 0)
 
 
diff --git a/fuzzers/017-clbprecyinit/README.txt b/fuzzers/017-clbprecyinit/README.md
similarity index 100%
rename from fuzzers/017-clbprecyinit/README.txt
rename to fuzzers/017-clbprecyinit/README.md
diff --git a/fuzzers/018-clbram/README.txt b/fuzzers/018-clbram/README.md
similarity index 100%
rename from fuzzers/018-clbram/README.txt
rename to fuzzers/018-clbram/README.md
diff --git a/fuzzers/019-ndi1mux/Makefile b/fuzzers/019-ndi1mux/Makefile
index 1a7faa6..5e13caf 100644
--- a/fuzzers/019-ndi1mux/Makefile
+++ b/fuzzers/019-ndi1mux/Makefile
@@ -3,11 +3,9 @@
 SPECIMENS_OK := $(addsuffix /OK,$(SPECIMENS))
 
 database: $(SPECIMENS_OK)
-	${XRAY_SEGMATCH} -o seg_clblx.segbits $(addsuffix /segdata_clbl[lm]_[lr].txt,$(SPECIMENS))
+	${XRAY_SEGMATCH} -o seg_clblx.segbits $(addsuffix /segdata_clblm_[lr].txt,$(SPECIMENS))
 
 pushdb:
-	${XRAY_MERGEDB} clbll_l seg_clblx.segbits
-	${XRAY_MERGEDB} clbll_r seg_clblx.segbits
 	${XRAY_MERGEDB} clblm_l seg_clblx.segbits
 	${XRAY_MERGEDB} clblm_r seg_clblx.segbits
 
diff --git a/fuzzers/019-ndi1mux/README.txt b/fuzzers/019-ndi1mux/README.md
similarity index 100%
rename from fuzzers/019-ndi1mux/README.txt
rename to fuzzers/019-ndi1mux/README.md
diff --git a/lib/include/prjxray/xilinx/xc7series/bitstream_writer.h b/lib/include/prjxray/xilinx/xc7series/bitstream_writer.h
index ae0634d..806cc9a 100644
--- a/lib/include/prjxray/xilinx/xc7series/bitstream_writer.h
+++ b/lib/include/prjxray/xilinx/xc7series/bitstream_writer.h
@@ -23,7 +23,7 @@
 class BitstreamWriter {
        public:
 	typedef std::array<uint32_t, 6> header_t;
-	typedef std::vector<ConfigurationPacket> packets_t;
+	typedef std::vector<std::unique_ptr<ConfigurationPacket>> packets_t;
 	// Only defined if a packet exists
 	typedef absl::optional<absl::Span<const uint32_t>> op_data_t;
 	typedef absl::Span<const uint32_t>::iterator data_iterator_t;
diff --git a/lib/include/prjxray/xilinx/xc7series/command.h b/lib/include/prjxray/xilinx/xc7series/command.h
new file mode 100644
index 0000000..2ff16e8
--- /dev/null
+++ b/lib/include/prjxray/xilinx/xc7series/command.h
@@ -0,0 +1,34 @@
+#ifndef PRJXRAY_LIB_XILINX_XC7SERIES_COMMAND_H_
+#define PRJXRAY_LIB_XILINX_XC7SERIES_COMMAND_H_
+
+namespace prjxray {
+namespace xilinx {
+namespace xc7series {
+
+enum class Command : uint32_t {
+	NOP = 0x0,
+	WCFG = 0x1,
+	MFW = 0x2,
+	LFRM = 0x3,
+	RCFG = 0x4,
+	START = 0x5,
+	RCAP = 0x6,
+	RCRC = 0x7,
+	AGHIGH = 0x8,
+	SWITCH = 0x9,
+	GRESTORE = 0xA,
+	SHUTDOWN = 0xB,
+	GCAPTURE = 0xC,
+	DESYNC = 0xD,
+	IPROG = 0xF,
+	CRCC = 0x10,
+	LTIMER = 0x11,
+	BSPI_READ = 0x12,
+	FALL_EDGE = 0x13,
+};
+
+}  // namespace xc7series
+}  // namespace xilinx
+}  // namespace prjxray
+
+#endif  // PRJXRAY_LIB_XILINX_XC7SERIES_COMMAND_H_
diff --git a/lib/include/prjxray/xilinx/xc7series/configuration_options_0_value.h b/lib/include/prjxray/xilinx/xc7series/configuration_options_0_value.h
new file mode 100644
index 0000000..1b7c1c1
--- /dev/null
+++ b/lib/include/prjxray/xilinx/xc7series/configuration_options_0_value.h
@@ -0,0 +1,122 @@
+#ifndef PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_OPTIONS_0_VALUE_H
+#define PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_OPTIONS_0_VALUE_H
+
+#include <prjxray/bit_ops.h>
+#include <prjxray/xilinx/xc7series/configuration_packet.h>
+#include <prjxray/xilinx/xc7series/configuration_register.h>
+
+namespace prjxray {
+namespace xilinx {
+namespace xc7series {
+
+class ConfigurationOptions0Value {
+       public:
+	enum class StartupClockSource : uint32_t {
+		CCLK = 0x0,
+		User = 0x1,
+		JTAG = 0x2,
+	};
+
+	enum class SignalReleaseCycle : uint32_t {
+		Phase1 = 0x0,
+		Phase2 = 0x1,
+		Phase3 = 0x2,
+		Phase4 = 0x3,
+		Phase5 = 0x4,
+		Phase6 = 0x5,
+		TrackDone = 0x6,
+		Keep = 0x7,
+	};
+
+	enum class StallCycle : uint32_t {
+		Phase0 = 0x0,
+		Phase1 = 0x1,
+		Phase2 = 0x2,
+		Phase3 = 0x3,
+		Phase4 = 0x4,
+		Phase5 = 0x5,
+		Phase6 = 0x6,
+		NoWait = 0x7,
+	};
+
+	ConfigurationOptions0Value() : value_(0) {}
+
+	operator uint32_t() const { return value_; }
+
+	ConfigurationOptions0Value& SetUseDonePinAsPowerdownStatus(
+	    bool enabled) {
+		value_ = bit_field_set(value_, 27, 27, enabled ? 1 : 0);
+		return *this;
+	}
+
+	ConfigurationOptions0Value& SetAddPipelineStageForDoneIn(bool enabled) {
+		value_ = bit_field_set(value_, 25, 25, enabled ? 1 : 0);
+		return *this;
+	}
+
+	ConfigurationOptions0Value& SetDriveDoneHigh(bool enabled) {
+		value_ = bit_field_set(value_, 24, 24, enabled);
+		return *this;
+	}
+
+	ConfigurationOptions0Value& SetReadbackIsSingleShot(bool enabled) {
+		value_ = bit_field_set(value_, 23, 23, enabled);
+		return *this;
+	}
+
+	ConfigurationOptions0Value& SetCclkFrequency(uint32_t mhz) {
+		value_ = bit_field_set(value_, 22, 17, mhz);
+		return *this;
+	}
+
+	ConfigurationOptions0Value& SetStartupClockSource(
+	    StartupClockSource source) {
+		value_ = bit_field_set(value_, 16, 15,
+		                       static_cast<uint32_t>(source));
+		return *this;
+	}
+
+	ConfigurationOptions0Value& SetReleaseDonePinAtStartupCycle(
+	    SignalReleaseCycle cycle) {
+		value_ =
+		    bit_field_set(value_, 14, 12, static_cast<uint32_t>(cycle));
+		return *this;
+	}
+
+	ConfigurationOptions0Value& SetStallAtStartupCycleUntilDciMatch(
+	    StallCycle cycle) {
+		value_ =
+		    bit_field_set(value_, 11, 9, static_cast<uint32_t>(cycle));
+		return *this;
+	};
+
+	ConfigurationOptions0Value& SetStallAtStartupCycleUntilMmcmLock(
+	    StallCycle cycle) {
+		value_ =
+		    bit_field_set(value_, 8, 6, static_cast<uint32_t>(cycle));
+		return *this;
+	};
+
+	ConfigurationOptions0Value& SetReleaseGtsSignalAtStartupCycle(
+	    SignalReleaseCycle cycle) {
+		value_ =
+		    bit_field_set(value_, 5, 3, static_cast<uint32_t>(cycle));
+		return *this;
+	}
+
+	ConfigurationOptions0Value& SetReleaseGweSignalAtStartupCycle(
+	    SignalReleaseCycle cycle) {
+		value_ =
+		    bit_field_set(value_, 2, 0, static_cast<uint32_t>(cycle));
+		return *this;
+	}
+
+       private:
+	uint32_t value_;
+};  // namespace xc7series
+
+}  // namespace xc7series
+}  // namespace xilinx
+}  // namespace prjxray
+
+#endif  // PRJXRAY_LIB_XILINX_XC7SERIES_CONFIGURATION_OPTIONS_0_VALUE_H
diff --git a/lib/include/prjxray/xilinx/xc7series/configuration_packet_with_payload.h b/lib/include/prjxray/xilinx/xc7series/configuration_packet_with_payload.h
new file mode 100644
index 0000000..bdcdc3c
--- /dev/null
+++ b/lib/include/prjxray/xilinx/xc7series/configuration_packet_with_payload.h
@@ -0,0 +1,33 @@
+#ifndef PRJXRAY_LIB_XILINX_XC7SERIES_g_CONFIGURATION_PACKET_WITH_PAYLOAD_H
+#define PRJXRAY_LIB_XILINX_XC7SERIES_g_CONFIGURATION_PACKET_WITH_PAYLOAD_H
+
+#include <memory>
+
+#include <absl/types/span.h>
+#include <prjxray/bit_ops.h>
+#include <prjxray/xilinx/xc7series/configuration_packet.h>
+#include <prjxray/xilinx/xc7series/configuration_register.h>
+
+namespace prjxray {
+namespace xilinx {
+namespace xc7series {
+
+template <int Words>
+class ConfigurationPacketWithPayload : public ConfigurationPacket {
+       public:
+	ConfigurationPacketWithPayload(
+	    Opcode op,
+	    ConfigurationRegister reg,
+	    const std::array<uint32_t, Words>& payload)
+	    : ConfigurationPacket(1, op, reg, absl::Span<uint32_t>(payload_)),
+	      payload_(std::move(payload)) {}
+
+       private:
+	std::array<uint32_t, Words> payload_;
+};  // namespace xc7series
+
+}  // namespace xc7series
+}  // namespace xilinx
+}  // namespace prjxray
+
+#endif  // PRJXRAY_LIB_XILINX_XC7SERIES_g_CONFIGURATION_PACKET_WITH_PAYLOAD_H
diff --git a/lib/include/prjxray/xilinx/xc7series/configuration_register.h b/lib/include/prjxray/xilinx/xc7series/configuration_register.h
index 9f75a09..4fbc5d4 100644
--- a/lib/include/prjxray/xilinx/xc7series/configuration_register.h
+++ b/lib/include/prjxray/xilinx/xc7series/configuration_register.h
@@ -25,6 +25,7 @@
 	COR1 = 0x0e,
 	WBSTAR = 0x10,
 	TIMER = 0x11,
+	UNKNOWN = 0x13,
 	BOOTSTS = 0x16,
 	CTL1 = 0x18,
 	BSPI = 0x1F,
diff --git a/lib/include/prjxray/xilinx/xc7series/nop_packet.h b/lib/include/prjxray/xilinx/xc7series/nop_packet.h
new file mode 100644
index 0000000..6533988
--- /dev/null
+++ b/lib/include/prjxray/xilinx/xc7series/nop_packet.h
@@ -0,0 +1,24 @@
+#ifndef PRJXRAY_LIB_XILINX_XC7SERIES_NOP_PACKET_H
+#define PRJXRAY_LIB_XILINX_XC7SERIES_NOP_PACKET_H
+
+#include <prjxray/xilinx/xc7series/configuration_packet.h>
+#include <prjxray/xilinx/xc7series/configuration_register.h>
+
+namespace prjxray {
+namespace xilinx {
+namespace xc7series {
+
+class NopPacket : public ConfigurationPacket {
+       public:
+	NopPacket()
+	    : ConfigurationPacket(1,
+	                          Opcode::NOP,
+	                          ConfigurationRegister::CRC,
+	                          {}) {}
+};
+
+}  // namespace xc7series
+}  // namespace xilinx
+}  // namespace prjxray
+
+#endif  // PRJXRAY_LIB_XILINX_XC7SERIES_NOP_PACKET_H
diff --git a/lib/xilinx/xc7series/bitstream_writer.cc b/lib/xilinx/xc7series/bitstream_writer.cc
index 3a7da30..eb388ca 100644
--- a/lib/xilinx/xc7series/bitstream_writer.cc
+++ b/lib/xilinx/xc7series/bitstream_writer.cc
@@ -28,7 +28,7 @@
 
 BitstreamWriter::packet_iterator BitstreamWriter::iterator::packet_begin() {
 	// itr_packets = packets.begin();
-	const ConfigurationPacket& packet = *itr_packets_;
+	const ConfigurationPacket& packet = **itr_packets_;
 
 	return BitstreamWriter::packet_iterator(
 	    &packet, BitstreamWriter::packet_iterator::STATE_HEADER,
@@ -36,7 +36,7 @@
 }
 
 BitstreamWriter::packet_iterator BitstreamWriter::iterator::packet_end() {
-	const ConfigurationPacket& packet = *itr_packets_;
+	const ConfigurationPacket& packet = **itr_packets_;
 
 	return BitstreamWriter::packet_iterator(
 	    &packet, BitstreamWriter::packet_iterator::STATE_END,
@@ -138,7 +138,7 @@
 	if (itr_packets != packets_.end()) {
 		// op_packet_itr = packet_begin();
 		// FIXME: de-duplicate this
-		const ConfigurationPacket& packet = *itr_packets;
+		const ConfigurationPacket& packet = **itr_packets;
 		packet_iterator packet_itr =
 		    packet_iterator(&packet, packet_iterator::STATE_HEADER,
 		                    packet.data().begin());
diff --git a/lib/xilinx/xc7series/bitstream_writer_test.cc b/lib/xilinx/xc7series/bitstream_writer_test.cc
index 752fa4c..be2d41e 100644
--- a/lib/xilinx/xc7series/bitstream_writer_test.cc
+++ b/lib/xilinx/xc7series/bitstream_writer_test.cc
@@ -50,7 +50,8 @@
 }
 
 // Special all 0's
-void AddType0(std::vector<xc7series::ConfigurationPacket>& packets) {
+void AddType0(
+    std::vector<std::unique_ptr<xc7series::ConfigurationPacket>>& packets) {
 	// InitWithWords doesn't like type 0
 	/*
 	static std::vector<uint32_t> words{0x00000000};
@@ -61,27 +62,32 @@
 	static std::vector<uint32_t> words{};
 	absl::Span<uint32_t> word_span(words);
 	// CRC is config value 0
-	packets.push_back(xc7series::ConfigurationPacket(
+	packets.emplace_back(new xc7series::ConfigurationPacket(
 	    0, xc7series::ConfigurationPacket::NOP,
 	    xc7series::ConfigurationRegister::CRC, word_span));
 }
 
-void AddType1(std::vector<xc7series::ConfigurationPacket>& packets) {
+void AddType1(
+    std::vector<std::unique_ptr<xc7series::ConfigurationPacket>>& packets) {
 	static std::vector<uint32_t> words{MakeType1(0x2, 0x3, 2), 0xAA, 0xBB};
 	absl::Span<uint32_t> word_span(words);
 	auto packet = xc7series::ConfigurationPacket::InitWithWords(word_span);
-	packets.push_back(*(packet.second));
+	packets.emplace_back(
+	    new xc7series::ConfigurationPacket(*(packet.second)));
 }
 
 // Empty
-void AddType1E(std::vector<xc7series::ConfigurationPacket>& packets) {
+void AddType1E(
+    std::vector<std::unique_ptr<xc7series::ConfigurationPacket>>& packets) {
 	static std::vector<uint32_t> words{MakeType1(0x2, 0x3, 0)};
 	absl::Span<uint32_t> word_span(words);
 	auto packet = xc7series::ConfigurationPacket::InitWithWords(word_span);
-	packets.push_back(*(packet.second));
+	packets.emplace_back(
+	    new xc7series::ConfigurationPacket(*(packet.second)));
 }
 
-void AddType2(std::vector<xc7series::ConfigurationPacket>& packets) {
+void AddType2(
+    std::vector<std::unique_ptr<xc7series::ConfigurationPacket>>& packets) {
 	// Type 1 packet with address
 	// Without this InitWithWords will fail on type 2
 	xc7series::ConfigurationPacket* packet1;
@@ -90,8 +96,9 @@
 		absl::Span<uint32_t> word_span(words);
 		auto packet1_pair =
 		    xc7series::ConfigurationPacket::InitWithWords(word_span);
-		packets.push_back(*(packet1_pair.second));
-		packet1 = &packets[0];
+		packets.emplace_back(
+		    new xc7series::ConfigurationPacket(*(packet1_pair.second)));
+		packet1 = packets[0].get();
 	}
 	// Type 2 packet with data
 	{
@@ -100,13 +107,14 @@
 		absl::Span<uint32_t> word_span(words);
 		auto packet = xc7series::ConfigurationPacket::InitWithWords(
 		    word_span, packet1);
-		packets.push_back(*(packet.second));
+		packets.emplace_back(
+		    new xc7series::ConfigurationPacket(*(packet.second)));
 	}
 }
 
 // Empty packets should produce just the header
 TEST(BitstreamWriterTest, WriteHeader) {
-	std::vector<xc7series::ConfigurationPacket> packets;
+	std::vector<std::unique_ptr<xc7series::ConfigurationPacket>> packets;
 
 	xc7series::BitstreamWriter writer(packets);
 	std::vector<uint32_t> words(writer.begin(), writer.end());
@@ -120,7 +128,7 @@
 }
 
 TEST(BitstreamWriterTest, WriteType0) {
-	std::vector<xc7series::ConfigurationPacket> packets;
+	std::vector<std::unique_ptr<xc7series::ConfigurationPacket>> packets;
 	AddType0(packets);
 	xc7series::BitstreamWriter writer(packets);
 	// dump_packets(writer, false);
@@ -133,7 +141,7 @@
 	EXPECT_EQ(words, ref);
 }
 TEST(BitstreamWriterTest, WriteType1) {
-	std::vector<xc7series::ConfigurationPacket> packets;
+	std::vector<std::unique_ptr<xc7series::ConfigurationPacket>> packets;
 	AddType1(packets);
 	xc7series::BitstreamWriter writer(packets);
 	// dump_packets(writer, false);
@@ -147,7 +155,7 @@
 }
 
 TEST(BitstreamWriterTest, WriteType2) {
-	std::vector<xc7series::ConfigurationPacket> packets;
+	std::vector<std::unique_ptr<xc7series::ConfigurationPacket>> packets;
 	AddType2(packets);
 	xc7series::BitstreamWriter writer(packets);
 	// dump_packets(writer, false);
@@ -164,7 +172,7 @@
 }
 
 TEST(BitstreamWriterTest, WriteMulti) {
-	std::vector<xc7series::ConfigurationPacket> packets;
+	std::vector<std::unique_ptr<xc7series::ConfigurationPacket>> packets;
 	AddType1(packets);
 	AddType1E(packets);
 	AddType2(packets);
diff --git a/minitests/bram/README.txt b/minitests/bram/README.md
similarity index 100%
rename from minitests/bram/README.txt
rename to minitests/bram/README.md
diff --git a/minitests/clb_bused/README.txt b/minitests/clb_bused/README.md
similarity index 100%
rename from minitests/clb_bused/README.txt
rename to minitests/clb_bused/README.md
diff --git a/minitests/clb_ffcfg/README.txt b/minitests/clb_ffcfg/README.md
similarity index 100%
rename from minitests/clb_ffcfg/README.txt
rename to minitests/clb_ffcfg/README.md
diff --git a/minitests/clb_muxf8/README.txt b/minitests/clb_muxf8/README.md
similarity index 100%
rename from minitests/clb_muxf8/README.txt
rename to minitests/clb_muxf8/README.md
diff --git a/minitests/clb_n5ffmux/README.txt b/minitests/clb_n5ffmux/README.md
similarity index 100%
rename from minitests/clb_n5ffmux/README.txt
rename to minitests/clb_n5ffmux/README.md
diff --git a/minitests/clb_ncy0/README.txt b/minitests/clb_ncy0/README.md
similarity index 100%
rename from minitests/clb_ncy0/README.txt
rename to minitests/clb_ncy0/README.md
diff --git a/minitests/clb_ndi1mux/README.txt b/minitests/clb_ndi1mux/README.md
similarity index 100%
rename from minitests/clb_ndi1mux/README.txt
rename to minitests/clb_ndi1mux/README.md
diff --git a/minitests/clb_nffmux/README.txt b/minitests/clb_nffmux/README.md
similarity index 100%
rename from minitests/clb_nffmux/README.txt
rename to minitests/clb_nffmux/README.md
diff --git a/minitests/clb_noutmux/README.txt b/minitests/clb_noutmux/README.md
similarity index 100%
rename from minitests/clb_noutmux/README.txt
rename to minitests/clb_noutmux/README.md
diff --git a/minitests/clb_ram/README.txt b/minitests/clb_ram/README.md
similarity index 100%
rename from minitests/clb_ram/README.txt
rename to minitests/clb_ram/README.md
diff --git a/minitests/fixedpnr/README.txt b/minitests/fixedpnr/README.md
similarity index 100%
rename from minitests/fixedpnr/README.txt
rename to minitests/fixedpnr/README.md
diff --git a/minitests/partial_reconfig_flow/Makefile b/minitests/partial_reconfig_flow/Makefile
index f451f81..239cac4 100644
--- a/minitests/partial_reconfig_flow/Makefile
+++ b/minitests/partial_reconfig_flow/Makefile
@@ -1,4 +1,4 @@
-.PRECIOUS: harness_impl.dcp %_impl.dcp %.bit
+.PRECIOUS: harness_impl.dcp %_impl.dcp %.bit %_roi_partial.bit
 
 # Top-level target for generating a programmable bitstream.  Given a .fasm
 # file, calling make with the .fasm extension replaced with _hand_crafted.bit
@@ -6,49 +6,14 @@
 # ready for programming to a board.  For example,
 # 'make inv_hand_crafted.bit' will generate a bitstream that includes the
 # design from roi_noninv.fasm. 
-%_hand_crafted.bit: init_sequence.bit %_no_headers.bin final_sequence.bin
-	cat $^ > $@
-
-%_no_headers.bin: %_patched.bin
-	# WARNING: these values need to be tweaked if anything about the
-	# Vivado-generated design changes.
-	xxd -p -s 0x18 $< | xxd -r -p - $@
-
-%_patched.bin: %_roi_partial.frm harness.bit
+%_hand_crafted.bit: %_roi_partial.frm harness.bit
 	${XRAY_TOOLS_DIR}/xc7patch \
-		--part_file ${XRAY_PART_YAML} \
+		--part_name "${XRAY_PART}" \
+		--part_file "${XRAY_PART_YAML}" \
 		--bitstream_file harness.bit \
 		--frm_file $< \
 		--output_file $@
 
-# xc7patch currently only generates the actual frame writes which is
-# insufficient to program a device.  Grab the initialization and finalization
-# sequences from the harness bitstream so they can be tacked on to the
-# xc7patch-generated bitstream to create a programmable bitstream.
-#
-# The offsets used below were determined by manually inspecting
-# harness.bit with a hex editor.  init_sequence.bit is the beginning of
-# the file until just before the actual frame data is sent via a write to FDRI.
-# final_sequence.bin is from just after the frame data write to the end of the
-# file.  Note that final_sequence.bin normally includes at least one CRC check.
-# The sed command replaces any CRC checks with a Reset CRC command which is the
-# same behavior as setting BITSTREAM.GENERAL.CRC to Disabled.  These offset
-# should not change unless you alter the bitstream format used (i.e. setting
-# BITSTREAM.GENERAL.DEBUGBITSTREAM or BITSTREAM.GENERAL.PERFRAMECRC to YES).
-init_sequence.bit: harness.bit
-	# WARNING: these values need to be tweaked if anything about the
-	# Vivado-generated design changes.
-	xxd -p -l 0x147 $< | xxd -r -p - $@
-
-final_sequence.bin: harness.bit
-	# WARNING: these values need to be tweaked if anything about the
-	# Vivado-generated design changes.
-	xxd -p -s 0x216abf $< | \
-		tr -d '\n' | \
-		sed -e 's/30000001.\{8\}/3000800100000007/g' | \
-		fold -w 40 | \
-		xxd -r -p - $@
-
 # Generate a suitable harness by using Vivado's partial reconfiguration
 # feature.  inv.v is used as a sample reconfiguration design as one is
 # required to generate a partial reconfiguration design.
diff --git a/minitests/picorv32-v/README.txt b/minitests/picorv32-v/README.md
similarity index 100%
rename from minitests/picorv32-v/README.txt
rename to minitests/picorv32-v/README.md
diff --git a/minitests/picorv32-y/README.txt b/minitests/picorv32-y/README.md
similarity index 100%
rename from minitests/picorv32-y/README.txt
rename to minitests/picorv32-y/README.md
diff --git a/minitests/roi_harness/README.txt b/minitests/roi_harness/README.md
similarity index 100%
rename from minitests/roi_harness/README.txt
rename to minitests/roi_harness/README.md
diff --git a/minitests/roi_harness/fasm2bit.sh b/minitests/roi_harness/fasm2bit.sh
index 3e7798c..5beb90f 100755
--- a/minitests/roi_harness/fasm2bit.sh
+++ b/minitests/roi_harness/fasm2bit.sh
@@ -30,28 +30,11 @@
 ${XRAY_DIR}/tools/fasm2frame.py $fasm_in roi_partial.frm
 
 ${XRAY_TOOLS_DIR}/xc7patch \
+	--part_name ${XRAY_PART} \
 	--part_file ${XRAY_PART_YAML} \
 	--bitstream_file $bit_in \
 	--frm_file roi_partial.frm \
-	--output_file patched.bin
-
-# WARNING: these values need to be tweaked if anything about the
-# Vivado-generated design changes.
-xxd -p -l 0x147 $bit_in | xxd -r -p - init_sequence.bit
-
-# WARNING: these values need to be tweaked if anything about the
-# Vivado-generated design changes.
-xxd -p -s 0x18 patched.bin | xxd -r -p - no_headers.bin
-
-# WARNING: these values need to be tweaked if anything about the
-# Vivado-generated design changes.
-xxd -p -s 0x216abf $bit_in | \
-	tr -d '\n' | \
-	sed -e 's/30000001.\{8\}/3000800100000007/g' | \
-	fold -w 40 | \
-	xxd -r -p - final_sequence.bin
-
-cat init_sequence.bit no_headers.bin final_sequence.bin >$bit_out
+	--output_file $bit_out
 
 #openocd -f $XRAY_DIR/utils/openocd/board-digilent-basys3.cfg -c "init; pld load 0 $bit_out; exit"
 
diff --git a/requirements.txt b/requirements.txt
index 612ba38..f16b1bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,5 @@
-yapf
 futures
+sphinx
+sphinx_rtd_theme
+sphinx-autobuild
+yapf
diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index 06dc18c..85023a9 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -21,6 +21,7 @@
 add_executable(xc7patch xc7patch.cc)
 target_link_libraries(xc7patch
 	absl::strings
+	absl::time
 	gflags
 	libprjxray
 )
diff --git a/tools/xc7patch.cc b/tools/xc7patch.cc
index 3e0c549..9ea3962 100644
--- a/tools/xc7patch.cc
+++ b/tools/xc7patch.cc
@@ -5,14 +5,23 @@
 #include <string>
 #include <vector>
 
+#include <absl/strings/str_cat.h>
 #include <absl/strings/str_split.h>
+#include <absl/time/clock.h>
+#include <absl/time/time.h>
 #include <gflags/gflags.h>
 #include <prjxray/memory_mapped_file.h>
 #include <prjxray/xilinx/xc7series/bitstream_reader.h>
 #include <prjxray/xilinx/xc7series/bitstream_writer.h>
+#include <prjxray/xilinx/xc7series/command.h>
 #include <prjxray/xilinx/xc7series/configuration.h>
+#include <prjxray/xilinx/xc7series/configuration_options_0_value.h>
+#include <prjxray/xilinx/xc7series/configuration_packet_with_payload.h>
+#include <prjxray/xilinx/xc7series/ecc.h>
+#include <prjxray/xilinx/xc7series/nop_packet.h>
 #include <prjxray/xilinx/xc7series/part.h>
 
+DEFINE_string(part_name, "", "");
 DEFINE_string(part_file, "", "Definition file for target 7-series part");
 DEFINE_string(bitstream_file,
               "",
@@ -111,54 +120,16 @@
 
 		uint32_t ecc = 0;
 		for (size_t ii = 0; ii < frame_data.size(); ++ii) {
-			uint32_t word = frame_data[ii];
-			uint32_t offset = ii * 32;
-			if (ii > 0x25) {
-				offset += 0x1360;
-			} else if (ii > 0x6) {
-				offset += 0x1340;
-			} else {
-				offset += 0x1320;
-			}
-
-			// Mask out where the ECC should be.
-			if (ii == 0x32) {
-				word &= 0xFFFFE000;
-			}
-
-			for (int jj = 0; jj < 32; ++jj) {
-				if ((word & 1) == 1) {
-					ecc ^= offset + jj;
-				}
-				word >>= 1;
-			}
+			ecc = xc7series::icap_ecc(ii, frame_data[ii], ecc);
 		}
 
-		uint32_t v = ecc & 0xFFF;
-		v ^= v >> 8;
-		v ^= v >> 4;
-		v ^= v >> 2;
-		v ^= v >> 1;
-		ecc ^= (v & 1) << 12;
-
 		// Replace the old ECC with the new.
 		frame_data[0x32] &= 0xFFFFE000;
 		frame_data[0x32] |= (ecc & 0x1FFF);
 	}
 
-#if 0
-	for (auto& frame : frames) {
-		std::cout << "0x" << std::hex
-		          << static_cast<uint32_t>(frame.first) << " ";
-
-		for (auto& word : frame.second) {
-			std::cout << "0x" << std::hex << word << ",";
-		}
-
-		std::cout << std::endl;
-	}
-#endif
-	std::vector<xc7series::ConfigurationPacket> out_packets;
+	std::vector<std::unique_ptr<xc7series::ConfigurationPacket>>
+	    out_packets;
 
 	// Generate a single type 2 packet that writes everything at once.
 	std::vector<uint32_t> packet_data;
@@ -177,18 +148,167 @@
 	}
 	packet_data.insert(packet_data.end(), 202, 0);
 
-	out_packets.push_back(xc7series::ConfigurationPacket(
+	// Initialization sequence
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::TIMER, {0x0}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::WBSTAR, {0x0}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::NOP)}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::RCRC)}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::UNKNOWN, {0x0}));
+
+	// Configuration Options 0
+	out_packets.emplace_back(new xc7series::ConfigurationPacketWithPayload<
+	                         1>(
+	    xc7series::ConfigurationPacket::Opcode::Write,
+	    xc7series::ConfigurationRegister::COR0,
+	    {xc7series::ConfigurationOptions0Value()
+	         .SetAddPipelineStageForDoneIn(true)
+	         .SetReleaseDonePinAtStartupCycle(
+	             xc7series::ConfigurationOptions0Value::SignalReleaseCycle::
+	                 Phase4)
+	         .SetStallAtStartupCycleUntilDciMatch(
+	             xc7series::ConfigurationOptions0Value::StallCycle::NoWait)
+	         .SetStallAtStartupCycleUntilMmcmLock(
+	             xc7series::ConfigurationOptions0Value::StallCycle::NoWait)
+	         .SetReleaseGtsSignalAtStartupCycle(
+	             xc7series::ConfigurationOptions0Value::SignalReleaseCycle::
+	                 Phase5)
+	         .SetReleaseGweSignalAtStartupCycle(
+	             xc7series::ConfigurationOptions0Value::SignalReleaseCycle::
+	                 Phase6)}));
+
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::COR1, {0x0}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::IDCODE, {part->idcode()}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::SWITCH)}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::MASK, {0x401}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CTL0, {0x501}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::MASK, {0x0}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CTL1, {0x0}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::FAR, {0x0}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::WCFG)}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+
+	// Frame data write
+	out_packets.emplace_back(new xc7series::ConfigurationPacket(
 	    1, xc7series::ConfigurationPacket::Opcode::Write,
 	    xc7series::ConfigurationRegister::FDRI, {}));
-	out_packets.push_back(xc7series::ConfigurationPacket(
+	out_packets.emplace_back(new xc7series::ConfigurationPacket(
 	    2, xc7series::ConfigurationPacket::Opcode::Write,
 	    xc7series::ConfigurationRegister::FDRI, packet_data));
 
-#if 0
-	for (auto& packet : out_packets) {
-		std::cout << packet << std::endl;
+	// Finalization sequence
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::RCRC)}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::GRESTORE)}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::LFRM)}));
+	for (int ii = 0; ii < 100; ++ii) {
+		out_packets.emplace_back(new xc7series::NopPacket());
 	}
-#endif
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::START)}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::FAR, {0x3be0000}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::MASK, {0x501}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CTL0, {0x501}));
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::RCRC)}));
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(new xc7series::NopPacket());
+	out_packets.emplace_back(
+	    new xc7series::ConfigurationPacketWithPayload<1>(
+	        xc7series::ConfigurationPacket::Opcode::Write,
+	        xc7series::ConfigurationRegister::CMD,
+	        {static_cast<uint32_t>(xc7series::Command::DESYNC)}));
+	for (int ii = 0; ii < 400; ++ii) {
+		out_packets.emplace_back(new xc7series::NopPacket());
+	}
 
 	// Write bitstream.
 	xc7series::BitstreamWriter out_bitstream_writer(out_packets);
@@ -199,6 +319,61 @@
 		return 1;
 	}
 
+	// Xilinx BIT header.
+	// Sync header
+	std::vector<uint8_t> bit_header{0x0,  0x9,  0x0f, 0xf0, 0x0f,
+	                                0xf0, 0x0f, 0xf0, 0x0f, 0xf0,
+	                                0x00, 0x00, 0x01, 'a'};
+	auto build_source = absl::StrCat(FLAGS_frm_file, ";Generator=xc7patch");
+	bit_header.push_back(
+	    static_cast<uint8_t>((build_source.size() + 1) >> 8));
+	bit_header.push_back(static_cast<uint8_t>(build_source.size() + 1));
+	bit_header.insert(bit_header.end(), build_source.begin(),
+	                  build_source.end());
+	bit_header.push_back(0x0);
+
+	// Source file.
+	bit_header.push_back('b');
+	bit_header.push_back(
+	    static_cast<uint8_t>((FLAGS_part_name.size() + 1) >> 8));
+	bit_header.push_back(static_cast<uint8_t>(FLAGS_part_name.size() + 1));
+	bit_header.insert(bit_header.end(), FLAGS_part_name.begin(),
+	                  FLAGS_part_name.end());
+	bit_header.push_back(0x0);
+
+	// Build timestamp.
+	auto build_time = absl::Now();
+	auto build_date_string =
+	    absl::FormatTime("%E4Y/%m/%d", build_time, absl::UTCTimeZone());
+	auto build_time_string =
+	    absl::FormatTime("%H:%M:%S", build_time, absl::UTCTimeZone());
+
+	bit_header.push_back('c');
+	bit_header.push_back(
+	    static_cast<uint8_t>((build_date_string.size() + 1) >> 8));
+	bit_header.push_back(
+	    static_cast<uint8_t>(build_date_string.size() + 1));
+	bit_header.insert(bit_header.end(), build_date_string.begin(),
+	                  build_date_string.end());
+	bit_header.push_back(0x0);
+
+	bit_header.push_back('d');
+	bit_header.push_back(
+	    static_cast<uint8_t>((build_time_string.size() + 1) >> 8));
+	bit_header.push_back(
+	    static_cast<uint8_t>(build_time_string.size() + 1));
+	bit_header.insert(bit_header.end(), build_time_string.begin(),
+	                  build_time_string.end());
+	bit_header.push_back(0x0);
+
+	bit_header.insert(bit_header.end(), {'e', 0x0, 0x0, 0x0, 0x0});
+	out_file.write(reinterpret_cast<const char*>(bit_header.data()),
+	               bit_header.size());
+
+	auto end_of_header_pos = out_file.tellp();
+	auto header_data_length_pos =
+	    end_of_header_pos - static_cast<std::ofstream::off_type>(4);
+
 	for (uint32_t word : out_bitstream_writer) {
 		out_file.put((word >> 24) & 0xFF);
 		out_file.put((word >> 16) & 0xFF);
@@ -206,5 +381,13 @@
 		out_file.put((word)&0xFF);
 	}
 
+	uint32_t length_of_data = out_file.tellp() - end_of_header_pos;
+
+	out_file.seekp(header_data_length_pos);
+	out_file.put((length_of_data >> 24) & 0xFF);
+	out_file.put((length_of_data >> 16) & 0xFF);
+	out_file.put((length_of_data >> 8) & 0xFF);
+	out_file.put((length_of_data)&0xFF);
+
 	return 0;
 }