Split the monolithic test_cam_basic.py into separate test suites
organized by noise configuration (no_noise, write_noise, read_noise),
with shared utilities extracted to tests/top/utils.py.
- Remove test_cam_basic.py; add no_noise/, write_noise/, read_noise/
test suites with Makefiles that set noise parameters statically
- Extract helpers (reset_dut, write_rows, query_once, collect_topk,
etc.) into tests/top/utils.py
- Update hw/sim/Makefile with per-config test targets and a
test-top-all meta-target
- Update scripts/run_cam_correctness.py to build per-directory
instead of centrally, removing inline parameter overrides
- Add __init__.py for result_serializer and topk_tracker module tests
- Expand docstrings in test_ref_model_noise.py with architectural
context and test rationale
- Extract cam_bank as a parameterized submodule with independent read/write ports
- Replace flat 2D memory array with generate loop of bank instances
- Derive bank selection from address bit slicing instead of modulo arithmetic
- Align rd_base_row_i check with new bank addressing scheme
- Add test verifying bank address isolation across multiple banks
- 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
- Set READ_NOISE_EN=1 as default in cam_top.sv
- Wire READ_NOISE_* parameters to NOISE_* makefile variables in cocotb-common.mk
- Add PYTHON env variable support in Makefile for test invocation
- Update .gitignore with glob patterns (**/sim_build/, **/results.xml, *.fst)
- Add justfile recipe for remote cam-test-top execution
- 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
- 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
- Delete popcount.sv, argmax_update.sv, cam_core.sv, match_engine.sv
- Remove obsolete VERILOG_SOURCES entries from Makefile
- Update comment in cam_top.sv to reference match_engine_pipeline
- Add verilator to devenv.nix for simulation support
- 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
- Add verilator to dependencies
- Add configurable logging via QUIET/VERBOSE/COCOTB_LOG_LEVEL env vars
- Add optional warning suppression (SUPPRESS_VERILATOR_WARNINGS)
- Clean up and restructure Makefile
- Split cam_core into pure memory (cam_core.sv) and match engine (match_engine.sv)
- Add cam_params.svh with centralized parameter definitions (NUM_ROWS, HASH_BITS, LANES, etc.)
- Update cam_top.sv to use shared parameters and compose match_engine
- Update Makefile to include new match_engine module and correct Verilator define syntax
