7 Commits

Author	SHA1	Message	Date
SikongJueluo	b9b5684718	test(popcount_pipeline): add cocotb test for popcount pipeline module ... - Add Makefile with cocotb configuration for popcount_pipeline RTL simulation - Add Python test module with reset, drive/expect helpers - Test row metadata preservation and bit-count correctness across 7 vectors	2026-05-18 15:37:26 +08:00
SikongJueluo	ca167e79c6	refactor(hw/sim): extract common cocotb make infrastructure into shared mk/ directory ... - Split monolithic hw/sim/Makefile into modular include files (mk/cocotb-common.mk, mk/rtl-sources.mk) - Add per-module test Makefiles (cam_core_banked, cam_read_noise, cam_write_noise, match_engine_pipeline, perf, top) - Add missing simulation tools (yosys, graphviz, xdot) to devenv.nix - Fix path handling in sweep_noise.py and test modules to be HASH_BITS-aware	2026-05-16 19:24:17 +08:00
SikongJueluo	2e0e36eea5	feat(sim): add CAM performance sweep test infrastructure ... - hw/sim/tests/test_cam_perf.py: new cocotb perf test with bounded wait helpers - scripts/sweep_cam_perf.py: sweep data model, matrix, and make command builders - tests/test_sweep_cam_perf.py: unit tests for sweep helpers - tests/conftest.py: pytest path configuration for scripts package - hw/sim/Makefile: deterministic noise params override for perf test compatibility	2026-05-16 15:42:29 +08:00
SikongJueluo	8f59a287c4	feat(hw): add banked CAM pipeline with grouped read/write noise ... - Add cam_core_banked.sv with 8-lane banked CAM core - Add cam_write_noise.sv and cam_read_noise.sv for grouped noise injection - Add noise_mask_grouped.sv generating grouped flip masks from 128-bit PRNG - Add match_engine_pipeline.sv with multi-stage pipelined top-1 selection - Add popcount_pipeline.sv for pipelined popcount operations - Refactor test_cam_basic.py with parametrized DUT introspection helpers - Add Python ref_model match_top1_with_read_noise() for read noise verification - Update Makefile with separate WRITE_NOISE_* and READ_NOISE_* parameter groups - Add new testbenches: test_cam_core_banked, test_cam_read_noise, test_cam_write_noise, test_match_engine_pipeline, test_ref_model_noise breaking change hint: NUM_ROWS default changed from 512→4096, LANES from 16→8	2026-05-13 18:22:28 +08:00
SikongJueluo	cbafc4524e	feat(cam): migrate noise generation from xorshift64 to xorshift128 ... - 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	2026-05-05 20:19:22 +08:00
SikongJueluo	2da17e101b	feat(rtl): migrate CAM interface to handshake protocol with integrated noise generation ... BREAKING CHANGE: CAM write and query interface replaced with standard valid/ready handshake. wr_en/wr_row/wr_hash → wr_valid/wr_ready/wr_addr/write_hash. External noise_mask_lanes_flat removed; noise generation now handled internally by cam_noisy module with configurable rate via parameters. - cam_top: add parameters (NOISE_EN, NOISE_RATE_NUM/DEN, NOISE_GEN/SAMPLE_BITS, NOISE_SEED) - cam_top: replace cam_core with cam_noisy (integrated noise generation) - match_engine: remove external noise_mask_lanes_flat input - hw/sim: update Makefile with noise parameters and compile args - hw/sim/model: add generate_write_flip_mask() and xorshift64() matching RTL behavior - hw/sim/tests: adapt testbench to new handshake protocol	2026-05-04 18:03:06 +08:00
SikongJueluo	f71bf06484	feat(hw): add XNOR-popcount CAM design with cocotb verification ... Implement a multi-lane Content Addressable Memory (CAM) that scores rows by XNOR popcount against a query hash and returns the top-1 match. RTL modules: - popcount: parallel group-based population count - argmax_update: iterative best-match tracking with tie-break - cam_core: parameterized scanning engine (NUM_ROWS/HASH_BITS/LANES) with optional SIM_NOISE and SIM_DEBUG ifdef guards - cam_top: thin wrapper exposing cam_core ports Verification: - Python reference model (ref_model.py) for score-level golden comparison - cocotb testbench (test_cam_basic.py) covering write/query/reset and external noise mask scenarios with score debug verification - Noise sweep script (sweep_noise.py) measuring top-1 stability under configurable bit-flip rates - Verilator-oriented Makefile with parameterizable compile options	2026-05-02 23:26:16 +08:00