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feat(fpga): make FT2232H default USB interface, rewrite FT601 write FSM, add clock-loss watchdog

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- Set USB_MODE default to 1 (FT2232H) in radar_system_top.v; 200T build
  overrides to USB_MODE=0 via build_200t.tcl generic property
- Rewrite FT601 write FSM: 4-state architecture with 3-word packed data,
  pending-flag gating, and frame sync counter
- Add FT2232H read FSM rd_cmd_complete flag, stream field zeroing, and
  range_data_ready 1-cycle pipeline delay in both USB modules
- Implement clock-loss watchdog: ft_heartbeat toggle + 16-bit timeout
  counter drives ft_clk_lost, feeding ft_effective_reset_n via 2-stage
  ASYNC_REG synchronizer chain
- Fix sample_counter reset literal width (11'd0 -> 12'd0)
- Add FT2232H I/O timing constraints to 50T XDC; fix dac_clk comments
- Document vestigial ft601_txe_n/rxf_n ports (needed for 200T XDC)
- Tie off AGC ports on TE0713 dev wrapper
- Rewrite tb_usb_data_interface.v for new 4-state FSM (89 checks)
- Add USB_MODE=1 regression runs; remove dead CHECK 5/6 loop
- Update diag_log.h USB interface comment
This commit is contained in:
Jason
2026-04-16 16:18:52 +05:45
parent 8609e455a0
commit f393e96d69
12 changed files with 623 additions and 407 deletions
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9_Firmware/9_2_FPGA/constraints/README.md
+8 -7
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@@ -32,8 +32,8 @@ the `USB_MODE` parameter in `radar_system_top.v`:
| USB_MODE | Interface | Bus Width | Speed | Board Target |
|----------|-----------|-----------|-------|--------------|
| 0 (default) | FT601 (USB 3.0) | 32-bit | 100 MHz | 200T premium dev board |
| 1 | FT2232H (USB 2.0) | 8-bit | 60 MHz | 50T production board |
| 0 | FT601 (USB 3.0) | 32-bit | 100 MHz | 200T premium dev board |
| 1 (default) | FT2232H (USB 2.0) | 8-bit | 60 MHz | 50T production board |
### How USB_MODE Works
@@ -72,7 +72,8 @@ The parameter is set via a **wrapper module** that overrides the default:
```
- **200T dev board**: `radar_system_top` is used directly as the top module.
`USB_MODE` defaults to `0` (FT601). No wrapper needed.
`USB_MODE` defaults to `1` (FT2232H) since production is the primary target.
Override with `.USB_MODE(0)` for FT601 builds.
### RTL Files by USB Interface
@@ -158,7 +159,7 @@ The build scripts automatically select the correct top module and constraints:
You do NOT need to set `USB_MODE` manually. The top module selection handles it:
- `radar_system_top_50t` forces `USB_MODE=1` internally
- `radar_system_top` defaults to `USB_MODE=0`
- `radar_system_top` defaults to `USB_MODE=1` (FT2232H, production default)
## How to Select Constraints in Vivado
@@ -190,9 +191,9 @@ read_xdc constraints/te0713_te0701_minimal.xdc
| Target | Top module | USB_MODE | USB Interface | Notes |
|--------|------------|----------|---------------|-------|
| 50T Production (FTG256) | `radar_system_top_50t` | 1 | FT2232H (8-bit) | Wrapper sets USB_MODE=1, ties off FT601 |
| 200T Dev (FBG484) | `radar_system_top` | 0 (default) | FT601 (32-bit) | No wrapper needed |
| Trenz TE0712/TE0701 | `radar_system_top_te0712_dev` | 0 (default) | FT601 (32-bit) | Minimal bring-up wrapper |
| Trenz TE0713/TE0701 | `radar_system_top_te0713_dev` | 0 (default) | FT601 (32-bit) | Alternate SoM wrapper |
| 200T Dev (FBG484) | `radar_system_top` | 0 (override) | FT601 (32-bit) | Build script overrides default USB_MODE=1 |
| Trenz TE0712/TE0701 | `radar_system_top_te0712_dev` | 0 (override) | FT601 (32-bit) | Minimal bring-up wrapper |
| Trenz TE0713/TE0701 | `radar_system_top_te0713_dev` | 0 (override) | FT601 (32-bit) | Alternate SoM wrapper |
## Trenz Split Status