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feat(cam): migrate noise generation from xorshift64 to xorshift128

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- Replace NOISE_GEN_BITS/NOISE_SAMPLE_BITS parameters with unified NOISE_BITS
- Use xorshift128 (random128) instead of xorshift64 for PRNG
- Add flip_mask_next combinational helper for single-cycle mask computation
- Add random_enable signal to advance PRNG only on accepted noisy writes
- Simplify FSM by removing mask_group_idx counter
- Update parameter validation: GROUP_BITS (= HASH_BITS/NOISE_BITS) must equal 64
- Update ref_model.py and tests to match new seed convention: {seed, seed}
- Update Makefile and sweep_noise.py with renamed parameters
This commit is contained in:
SikongJueluo
2026-05-05 19:30:51 +08:00
parent 0dd01fb1b7
commit cbafc4524e
8 changed files with 178 additions and 152 deletions
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6
hw/rtl/cam_top.sv
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@@ -5,8 +5,7 @@ module cam_top #(
parameter bit NOISE_EN = 1'b1,
parameter int NOISE_RATE_NUM = 1,
parameter int NOISE_RATE_DEN = 100,
parameter int NOISE_GEN_BITS = 8,
parameter int NOISE_SAMPLE_BITS = 8,
parameter int NOISE_BITS = 8,
parameter logic [63:0] NOISE_SEED = 64'hB504_F32D_B504_F32D
) (
input logic clk,
@@ -63,8 +62,7 @@ module cam_top #(
.NOISE_EN (NOISE_EN),
.NOISE_RATE_NUM (NOISE_RATE_NUM),
.NOISE_RATE_DEN (NOISE_RATE_DEN),
.NOISE_GEN_BITS (NOISE_GEN_BITS),
.NOISE_SAMPLE_BITS (NOISE_SAMPLE_BITS),
.NOISE_BITS (NOISE_BITS),
.NOISE_SEED (NOISE_SEED)
) u_noisy (
.clk (clk),