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foss-fpga-tools / prjxray / refs/heads/dependabot/submodules/third_party/abseil-cpp-424040a / . / fuzzers / 027-bram36-config
tree: 09c4badbd0a4c1b7c7c0c08615b0828abca88cd8 [path history] [tgz]
  1. bits.dbf
  2. generate.py
  3. generate.tcl
  4. Makefile
  5. README.md
  6. top.py
fuzzers/027-bram36-config/README.md

RAMB36 features

This fuzzer emits features that only are used in the RAMB36E1 cell. There are 3 categories:

  • ECC
  • RAM extension
  • Odd address modes

Odd address modes

Most RAMB36E1 address widths are expressed by configuring the underlying RAMB18E1 to handle half of the data. So RAMB36.READ_WIDTH = 4 is expressed as RAM18_Y0.READ_WIDTH = 2 and RAM18_Y1.READ_WIDTH = 2. However two address widths (1 and 9) are odd (e.g. not divisible by 2). In these cases, a RAMB36E1 specific feature is used. So RAMB36.READ_WIDTH = 9 is expressed as:

  • RAMB18_Y0.READ_WIDTH_4
  • RAMB18_Y1.READ_WIDTH_4
  • RAMB36.BRAM36_READ_WIDTH_1

and RAMB36.READ_WIDTH = 1 is expressed as:

  • RAMB18_Y0.READ_WIDTH_1
  • RAMB18_Y1.READ_WIDTH_1
  • RAMB36.BRAM36_READ_WIDTH_1