# Lattice / SiliconBlue iCE40 FPGAs

 * [`devices`](devices) - iCE40 FPGA devices. The devices architecture
   descriptions have approximations of the real fabric, to get real fabric you
   have to override the `rr_graph.xml` file.

   * [`devices/layouts`](devices/layouts) - Tile layout descriptions for devices.

   * [`devices/tile-routing-virt`](devices/tile-routing-virt) - Version of
     architecture which uses;
      * Local tracks inside a tile.
      * Fake fabric which "approximates" the real fabric inside the iCE40.

   * [`devices/top-routing-virt`](devices/top-routing-virt) - Version of
     architecture which uses;
      * Local tracks at rr_graph level.
      * Fake fabric which "approximates" the real fabric inside the iCE40.

 * [`primitives/`](primitives) - The primitives that make up the iCE40. These
   are generally used inside the tiles.

 * [`tiles/`](tiles) - The tiles found in the iCE40 architecture. The iCE40
   only really have 3 tile types,
    - [`tiles/plb`](tiles/plb) - Logic tiles, called `PLB`s
    - [`tiles/pio`](tiles/pio) - IO tiles, called `PIO`s
    - [`tiles/block_ram`](tiles/block_ram) - Block Ram tiles, which don't
      really have a name.

## Status
 - BELs
   - [ ] LUT+FF
     - [X] LUT
     - [X] FF modes (need to test all modes)
     - [ ] Carry chains
   - [ ] IO
     - [X] Simple Input
     - [X] Simple Output
     - [ ] Tri-state
     - [ ] LVDS
     - [ ] Global Buffer
   - [X] RAM40_4K
   - [ ] DSP
   - [ ] PLL
   - [ ] iCEGATE
   - [ ] Warmboot
 - Routing
   - [ ] ColBuf (currently all are turned on)
   - [ ] Global
   - [ ] Negihborhood
 - Timing
   - [ ] BEL
   - [ ] Routing