micheleandClaude Sonnet 5
175f697ae1
Implements M4: memory_manager.v (arbitration/buffering/forwarding/ latency hiding/double buffering, §12) + prefetch_engine.v (double-buffered tile fetch, §13), sitting on the REAL, UNMODIFIED V1 PSRAM backend chain (int8_memory_access.v -> memory_interface.v -> psram_controller.v, per §15's explicit mandate not to touch the controller). Verified fully end-to-end with Verilator: real neural_processor (M1) fed entirely by memory_manager, computing against PSRAM-resident X/W tiles (double-buffered prefetch across up to 5 tiles) and writing its result back to PSRAM -- checked via an independent PSRAM read-back, with poison bytes around the operand regions to catch addressing errors. 3/3 jobs pass (1/3/5-tile configurations). Three real RTL bugs found and fixed during integration (full diagnostic trail in errors.log ERR-0006): prefetch_engine had no single-in-flight-request discipline, letting a queued request corrupt the bank bookkeeping of a fetch already running; the fix's own !pf_busy guard had a one-cycle blind spot (pf_busy lags pf_start by a clock) that needed an explicit !pf_start term; and a state-based mux for the shared backend port was off by one cycle, silently dropping the PSRAM result write entirely. Real synthesis: 0 CHECK problems, 851 LUT4/789 FF/108 CCU2C/0 DSP (expected, no multiplication in this module). Real place&route (via a synthesis-only timing harness, needed for the same TRELLIS_IO pin- budget reason as M2's array): Fmax 165.86 MHz, PASS at 80MHz. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v
52 lines
2.7 KiB
Markdown
52 lines
2.7 KiB
Markdown
# FPGA-Neural V2 — stato roadmap
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Fonte del mandato: `docs/v2-description.md` (root del repository). Baseline
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funzionale/numerica/bit-exact: `hardware/v1/` (frozen, sola lettura — vedi
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`hardware/v1/README.md`).
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Legenda: `[ ]` non iniziato · `[~]` in corso · `[x]` completo (sim+synth+timing
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reali, non solo scritto).
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- [x] **M1 — Neural Processor** (`hardware/v2/rtl/neural_processor.v`, P8).
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Bit-exact vs V1 (7/7 test, Verilator), pipeline a 8 stadi
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funzionante, throughput reale (1 tile/ciclo). Sintesi reale: 0
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problemi CHECK, Fmax 183.12 MHz (ACC_WIDTH=32) — vedi
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`logs/experiments.log` EXP-0001/EXP-0002, `logs/errors.log` per 3
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bug reali trovati e risolti (2 del toolchain Icarus, 1 RTL).
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- [x] **M2 — Processor Array** (`neural_processor_array.v`). 1/2/4/8
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processor testati (sim concorrenza reale + sintesi/P&R reali).
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Fmax sempre PASS a 80MHz (159.11→134.70 MHz). Scoperta: il DSP
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(MULT18X18D), non LUT/FF, satura per primo (88% a N=8) — vedi
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`logs/decisions.log` DEC-0005.
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- [x] **M3 — Buffers** (`activation_buffer.v`, `weight_buffer.v`,
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`result_buffer.v`). Tutti inferiscono DP16KD reale (10/10 test,
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6/6 config sintetizzate 0 problemi). Scoperta: il costo BRAM di
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weight_buffer e' guidato da P_IN (larghezza), non da DEPTH.
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- [x] **M4 — Memory Manager** (`memory_manager.v`, `prefetch_engine.v`),
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backend PSRAM V1 riusato SENZA MODIFICHE. End-to-end reale (3/3
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job PASS) con vero neural_processor + vera catena PSRAM V1.
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3 bug RTL trovati/risolti (`logs/errors.log` ERR-0006). Fmax
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165.86 MHz.
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- [ ] **M5 — Neural Director** (`neural_director.v`), scheduling first-free.
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- [ ] **M6 — Dependency Manager** (`dependency_manager.v`), ready/waiting
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queue, dependency counters, wake-up, producer tracking.
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- [ ] **M7 — Dataflow Core** (`dataflow_core.v`), integrazione completa.
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- [ ] **M8 — PSRAM integration**, controller V1 non modificato, misura reale.
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- [ ] **M9 — Full benchmark**, tabella V1 vs V2 (§32 del mandato).
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- [ ] **M10 — Optimization**, solo sulla base dei dati raccolti in M1-M9.
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## Log
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Vedi `hardware/v2/logs/` (`development.log` per la cronologia di sessione,
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`decisions.log` per le decisioni architetturali con motivazione,
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`experiments.log` per ogni EXP-XXXX end-to-end).
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## Regole non negoziabili attive (§34 del mandato, per riferimento rapido)
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1. V1 (`hardware/v1/`) rimane intatta — mai modificata.
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2. V2 vive esclusivamente sotto `hardware/v2/`.
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3. Nessun risultato inventato: THEORETICAL vs SIMULATED vs SYNTHESIZED vs
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POST-P&R sempre etichettati esplicitamente.
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4. Ogni modifica/esperimento/decisione registrata nei log, mai persa.
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5. Ogni esperimento ha un ID univoco, mai riutilizzato — anche i FAIL restano.
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