artiq-zynq/cxp_note.md

# CXP

## Finished
- Upconn - Low speed serial 
  [x] Low speed serial PHY
    [x] 20.833Mbps & 41.666Mbps change
    [x] 8b10b encoder
  [x] TX Pipeline with priority transmission
    [x] Trigger
    [x] Trigger ack
    [x] Test & Ctrl packet with DMA
  [x] CTRL Packet serialize firmware
    [x] follow DRTIO DMA
    [x] check crc
- Downconn - GTX
  [x] GTX serial PHY
    [x] QPLL & GTX DRP to config linerate
    [x] Comma checker & restart rx
  [x] RX Pipeline with priority decoder
    [x] Trigger ack 
    [x] CTRL packet DMA with extra buffer
    [x] Connection test sequence checker
  [x] CTRL Packet deserialize firmware
    [x] follow DRTIO DMA
    [x] check crc
  [x] GTX Multilane setup
- Camera boostrap
  [x] get the CXP version
  [x] test connection
  [x] discovery other extension (links)
  [x] set bitrate
- Camera frame pipeline
  [x] CXP frame packet routing (maybe no need to routing non zero streaming id (we have ROI buildin anyways)?)
  [x] CXP CRC32 detection


## TODO
[] remove ALL debug tools
  [] flake.nix mod
  [] local_run.sh mod
### Gateware
[] Test out CXP trigger
[] Region of interest engine
[] rtio to getting the frame
  - O: trigger
  - I: frame

### Firmware
[] Camera linkdown detection
[] Camera auto linkup/linkdown using threads
[] API programming
[] add tag handling for api calls
  - support line reset in kernel using syscall
[] add heartbeat checking

### Coredevice Driver
[] support simple camera programming interface (Not real time)
  - basic i2c-like interface with read/write u32