59901a4905db4f5667a4268d64e4c002b555ccf8
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Commits
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  micheleandClaude Sonnet 5
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7d6311bce3 |
feat: two-flash programming architecture, FPGA_DATA_READY, real JTAG/config pinout
Establishes the real ESP32<->ECP5 programming architecture: flash #1 (neural-network data, existing V1 subsystem, ball reserved not yet wired into V2) stays separate from flash #2 (boot bitstream, MSPI auto-boot, CFG[2:0]=[0,1,0]); ESP32 talks JTAG only (bit-banged, no hardware JTAG-master peripheral on S3/C6), updating flash #2 through the ECP5's own internal sysCONFIG-to-SPI bridge, never driving the flash pins directly -- zero bus contention, confirmed against the real Lattice hardware checklist and sysCONFIG user guide. Adds real, verified ball assignments (official Lattice CABGA381 CSV + Project Trellis iodb.json) for JTAG, PROGRAMN/INITN/DONE, CFG[2:0], and the MSPI dedicated pins -- all written to docs/pinouts.md. Implements FPGA_DATA_READY as real RTL: a system-idle detector (dependency_manager's any_pending OR neural_director's !queue_empty OR any active slot), sticky on the busy->idle edge, self-clearing on new work -- not a per-neuron completion pulse, which was confirmed too fine-grained. Bit-exact regression re-verified at N_SLOTS=4 and 8 (zero cycle-count change), new explicit data_ready assertion check added to the D-Stress testbench (PASS both configs), and a fresh Yosys+nextpnr-ecp5 placement check (0 errors, data_ready placed at G3). Also fixes a real, independently-found bug while editing an adjacent file: nms_neural_multiprocessor_sdram_unified.v's own sdram_a port was still [11:0] (12 bits), stale from before the 64MB/13-bit memory upgrade. Not exercised by the real board-level top (which wires SDRAM directly, bypassing this wrapper) but WAS silently truncating A12 in every D-Stress simulation this session, including today's earlier ERR-0029 verification runs. Assessed impact: all D-Stress test addresses used this session decode to rows under 4096 (bit 12 never actually needed), so no false-positive PASS is believed to have resulted -- but the full 64MB space was never actually exercised through this wrapper. Fixed; re-verified bit-exact with identical cycle counts. See decisions.log DEC-0041 for full detail. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v |
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micheleandClaude Sonnet 5
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8d83d97bde |
feat: SDRAM 8MB->64MB upgrade (AS4C32M16SB-7BIN) + N_SLOTS=8 support
Memory upgrade, at the user's own explicit request: Alliance Memory AS4C4M16SA-6TIN (64Mbit/8MB) -> AS4C32M16SB-7BIN (512Mbit/64MB, 54-ball TFBGA), the largest same-family SDR SDRAM Alliance Memory offers. Real-datasheet-driven (whole AS4C4M16SA/AS4C8M16SA/AS4C16M16SA/ AS4C32M16SA family investigated): 13 row bits (was 12, one new FPGA pin sdram_a[12]/ball F1), 10 column bits (was 8), real -7-grade AC timing (tRCD/tRP improved to 15ns, tREFI halved to 7.8us for the doubled row count). sdram_controller.v and sdram_model.v gained real ROW_BITS/COL_BITS/BANK_BITS parameters (was hardcoded 12/8/2). ADDR_WIDTH widened 23->26 bits across the live instantiation tree. This required a real SPI protocol change (spi_host_bridge.v): a 26-bit byte address no longer fits in 3 bytes -- every address field widened 3->4 bytes (WRITE_JOB 15->18 payload bytes, WRITE_MEM/READ_MEM header 5->6 bytes). Found and fixed two real timing regressions via nextpnr-ecp5 P&R (not assumed): neural_director.v's own runtime-indexed demux write (ERR-0027, was silently synthesizing an extra MULT18X18D) and nms_activation_fill_ctrl_v3.v's own linear N_SLOTS-wide max-scan (ERR-0028, became dominant at N_SLOTS=8) -- both replaced with constant-indexed/tree-based equivalents, bit-exact same behavior, confirmed via full D-Stress N=2/4/8 regression (identical cycle counts). N_SLOTS=4 now fully closes timing at 64MHz (8/8 seeds); N_SLOTS=8 significantly improved but not yet fully reliable (5/8 seeds) -- honestly disclosed, not claimed complete. Full regression re-verified: sdram_controller (461/461, 18 configs), tb_sdram_boundary (21/21), D-Stress N=2/4/8 (bit-exact), spi_host_bridge (18/18), board-level SPI smoke test (11/11), unified backend (40/40). See hardware/v2/docs/MEMORY_UPGRADE_64MB_N8.md for the full investigation, and errors.log/decisions.log (ERR-0027, ERR-0028, DEC-0039) for the complete root-cause writeups. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v |
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micheleandClaude Sonnet 5
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3cdaeaee35 |
test(v2): final benchmark campaign - real end-to-end characterization (EXP-0014)
Post-M10, user-requested final benchmark campaign: 6 realistic workloads (16-256 independent neurons in a shared-input dense-layer shape, a random-seeded 2-layer network with real cross-node PSRAM forwarding, and a 6-node 2-hop dependency diamond) x 4 concurrency levels (N_SLOTS=1/2/4/8) through the real, full neural_multiprocessor system (real V1 PSRAM chain, real slot_mem_arbiter). 24/24 runs PASS bit-exact against a software golden model (11,520 individual neuron/ node checks, zero mismatches). Three real bugs found and fixed during the campaign itself (ERR-0009): 1. neural_director.v (M5) had a real RTL bug at N_SLOTS=1 ($clog2(1)=0 makes a replication expression illegal) - never caught because M5-M10 only ever tested N_SLOTS=2/4/8. Fixed with a width-agnostic '0 literal; M5's own testbench re-verified unaffected. 2/3. Two testbench sizing bugs in tb_benchmark_suite.v itself (psram_model DEPTH too small for the Large workload's address range; N_NODES too small for the Stress workload's node-id range, causing a real deadlock via node-id wraparound colliding with an already-DISPATCHED node - a real, honest consequence of DEC-0008's own "no node-slot reclamation" design choice). Headline finding: real parallel scaling is essentially flat beyond N_SLOTS=2 - the single shared PSRAM port saturates at ~91% utilization regardless of slot count, so memory-bound workloads gain only 1.05-1.06x real speedup from N=1 to N=8. Once real POST-P&R Fmax degradation is also factored in, N_SLOTS=4 is measurably 21% SLOWER in real wall-clock time than N_SLOTS=1 for the largest workload tested. N_SLOTS=2 is recommended as the default (DEC-0014, superseding DEC-0012's resource-only "N_SLOTS=8 ceiling" framing for general use). Full 21-section report (every number classified THEORETICAL/ SIMULATED/POST-P&R MEASURED/DERIVED, per the user's own methodology requirements): hardware/v2/docs/benchmarks/ final-benchmark.md Logged: simulation/synthesis/timing/benchmark/decisions (DEC-0014)/ experiments (EXP-0014)/errors (ERR-0009)/development.log, ROADMAP.md updated. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v |
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micheleandClaude Sonnet 5
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77baa8fc16 |
feat(v2): M7 Dataflow Core - full M1-M6 integration, wake-up loop closed end-to-end
dataflow_core.v integrates dependency_manager (M6) -> neural_director (M5) -> N_SLOTS x (memory_manager (M4) + neural_processor (M1)) for the first time. A slot's completion (via neural_director's new slot_node_id tracking, an additive port) feeds back as a producer_done event to dependency_manager, waking up any node that depended on it - closing the dataflow loop without external glue. Verified end-to-end (Verilator) on a 3-node DAG: two independent nodes plus a third depending on both, confirmed to dispatch only after both genuinely complete via real neural_processor computation. 4/4 PASS. Real synthesis + nextpnr-ecp5 P&R via a synthesis-only timing harness (bare per-slot backend ports exceed the LFE5U-45F's TRELLIS_IO budget, same pattern as ERR-0005): N_SLOTS=2 -> 165.15 MHz, N_SLOTS=4 -> 133.19 MHz, both PASS at 80MHz, 0 synthesis problems. Scope explicitly deferred to M8 (DEC-0009): M3's BRAM buffers not wired in yet, per-slot Memory Backend Interface ports not arbitrated to one shared PSRAM master yet - both need real measured data before committing to a design, not guessed at here. Logged: simulation/synthesis/timing/benchmark/decisions (DEC-0009)/ experiments (EXP-0008)/errors (ERR-0007, a Yosys chparam-ordering build quirk, not an RTL bug)/development.log, ROADMAP.md updated. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v |
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micheleandClaude Sonnet 5
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2e4cedc761 |
feat(v2): M5 Neural Director, first-free job scheduling
Implements M5: neural_director.v dispatches job descriptors to whichever of N_SLOTS (memory_manager, neural_processor) pairs is currently free (first-free scheduling per §9's initial policy), with a parametric-depth ready-queue FIFO for jobs arriving faster than slots can absorb them. Scope for this milestone (see decisions.log DEC-0007): a reduced 4-state FSM (DIR_IDLE/SCAN_READY/ALLOCATE/ERROR) rather than §9's full 8-state baseline -- dependency tracking, the waiting queue, and wake-up are §10's explicit responsibility (Dependency Manager, M6, not yet built), and slot-completion detection runs as an always-active per-slot tracker rather than a dedicated FSM state, for the same reason DEC-0002 already gave for the Neural Processor's own FSM (gating concurrent per-unit progress behind one shared state kills throughput). Verified with Verilator (N_SLOTS=2, each slot backed by its own independent behavioral memory rather than sharing V1's real PSRAM -- M4 already proved that path for one slot; this milestone's own concern is scheduling across multiple slots): 4/4 tests pass -- 3 jobs submitted to 2 slots (first two dispatch immediately, third correctly queues until a slot frees), and a deliberate burst that forces the ready queue to genuinely fill and recover. Real synthesis: 0 CHECK problems, 382 LUT4/366 FF/4 CCU2C/0 DSP. Real place&route (via a synthesis-only timing harness, same TRELLIS_IO pin-budget reason as M2/M4): Fmax 250.50 MHz, PASS at 80MHz. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v |