f5b8e7a20b
Rewrite gen_chirp_mem.py to emit the SHORT (1 µs), MEDIUM (5 µs), and LONG
(30 µs) waveform set on both TX and RX paths. The script is now the single
source for every chirp .mem file; the legacy 6-file set on disk
(long_chirp_lut.mem, long_chirp_seg{0,1}_{i,q}.mem, short_chirp_{i,q}.mem)
is no longer regenerated and gets deleted in PR-C/PR-E when its consumer
modules are removed.
Generated artifacts (committed):
TX (8-bit unsigned offset-binary, fs_dac = 120 MHz):
tx_short_lut.mem 120 lines
tx_medium_lut.mem 600 lines
tx_long_lut.mem 3600 lines
RX (Q15 I/Q hex, fs_sys = 100 MHz, all 2048 lines for uniform BRAM sizing):
rx_short_i.mem / rx_short_q.mem 100 active + 1948 zero-pad
rx_medium_i.mem / rx_medium_q.mem 500 active + 1548 zero-pad
rx_long_seg0_i.mem / rx_long_seg0_q.mem 2048 (samples [0..2047])
rx_long_seg1_i.mem / rx_long_seg1_q.mem 952 active + 1096 zero-pad
Phase model unchanged from chirp-v1: phi(n) = 2π·F_BASEBAND_LOW·t +
π·(BW/T)·t² with F_BASEBAND_LOW=10 MHz and BW=20 MHz. The same formula now
runs three durations and two sample rates from one helper.
rx_long_seg0_i.mem is bit-exact to the legacy long_chirp_seg0_i.mem on disk
(diff -q reports identical) — proves the SHORT/MEDIUM additions did not
perturb the LONG path.
Verification:
- all 11 files have correct line counts (above)
- script is idempotent (re-run produces byte-identical output)
- ruff clean (one E501 line-length + two RUF046 redundant-int casts fixed)
- phase regression at long-seg0 against pre-chirp-v2 reference: bit-exact
No RTL or testbench changes. The legacy .mem files remain on disk for the
existing chirp_memory_loader_param.v / plfm_chirp_controller.v consumers
until PR-C and PR-E delete those modules. No module references the new
files yet.
2049 lines
10 KiB
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2049 lines
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