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Jason
21bf7a0228
Closes the 161-µs MEDIUM PRI visibility gap from the 2026-05-02 e2e audit.
PR-G ran out of reserved bits in status_words[3] to fit a second 16-bit
pair, so this PR adds status_words[7] = {medium_chirp[15:0], medium_listen[15:0]}
and bumps STATUS_PKT_LEN 30→34, STATUS_PACKET_SIZE 30→34.
RTL (usb_data_interface_ft2232h.v):
- Two new input ports `status_medium_chirp` / `status_medium_listen`.
- status_words array bound 6→7, init loop 7→8, snapshot block packs word 7.
- STATUS_PKT_LEN width 5→6 bits to hold 34, byte-mux index widened
[4:0]→[5:0] with 4 new entries for word 7 + footer at index 33.
- Header docstring + length-localparam comment refreshed.
Top-level (radar_system_top.v): wire `host_medium_chirp_cycles` /
`host_medium_listen_cycles` into the FT2232H usb_inst (gen_ft2232h branch
only; legacy FT601 path retains its pre-PR-G 6-word / 26-byte layout —
no host code reads it today).
Host parser (radar_protocol.py):
- STATUS_PACKET_SIZE 30→34. Module docstring + parse_status_packet
docstring + find_bulk_frame_boundaries note refreshed.
- StatusResponse gains `medium_chirp` / `medium_listen` fields.
- Word-loop bounds 7→8; word-7 decode added.
Tests:
- tb_usb_protocol_v2 — drive default RP_DEF_MEDIUM_*_CYCLES (500/15600),
move T3.2 footer assertion 29→33, add T3.8..T3.11 for word-7 bytes.
Manual run: 31/31 PASS (TB not in run_regression.sh).
- tb_ft2232h_frame_drop, tb_e2e_dsp_to_host — tie new DUT ports to
16'd0 (these TBs don't exercise status reads).
- test_GUI_V65_Tk — extend _make_status_packet builder kwargs, rename
test_status_packet_is_30_bytes → _is_34_bytes, add round-trip +
16-bit-max tests for word 7.
- test_v7 — TestStatusPacketV2RoundTrip rewired for 8 words / 34 B,
add test_word7_medium_pri_decoded + test_pre_M5_30byte_packet_rejected.
Verification:
- FPGA regression (iverilog + xsim cosim): 42/0/0.
- tb_usb_protocol_v2 standalone: 31/0.
- Host test_GUI_V65_Tk: 119/119.
- Host test_v7: 152/152.