The tool to generate FASM features attempts to minimize divergence from icebox naming.

Differences from IceStorm names:

• / marks are replaced with _ to meet FASM naming convention
• RAM
  • RamConfig CBIT[0-3] are combined into READ_MODE and WRITE_MODE
• IO
  • IE and REN are inverted from icebox polarity
  • PINTYPE are not forwarded and instead SimpleInput and SimpleOutput features cover those bits

TODO:

• [ ] RAMCONFIG CBITS
  • [X] Supports READ_MODE adn WRITE_MODE
  • [ ] Support RAM Cascade bits
  • [X] PowerUp inverted for 1k parts
• [X] IE inverted for 1k parts
• [X] REN inverted
• [ ] Colbuf
  • All are on for now, but it's probably power hungry
  • [ ] Need to rework routing to represent Column Buffers
• [ ] beyond simple IO
  • Should rework solution by in tech mapping and passing parameters

Push down to IceStorm:

• [ ] store tiles as 2D bit arrays for manipulation in iceconfig
• [ ] empty_*() methods should init to lowest power config IE bits so buffers are off