micheleandClaude Sonnet 5
8af16d3a12
Implements M6: dependency_manager.v tracks a table of node
descriptors (node_id/state/required_dependencies/resolved_
dependencies/producer_ids -- §10's exact field list), incrementing a
waiting node's resolved count whenever one of its listed producers
completes, transitioning it to READY once resolved==required, and
dispatching ready nodes to the Neural Director (M5) one at a time via
a backpressure-safe valid/ready interface.
Verified with Verilator on a small hand-built DAG: node0/node1 have no
dependencies (dispatch immediately); node2 depends on BOTH node0 AND
node1 ("dipendenze multiple") and stays WAITING until both complete,
confirmed via an explicit negative check after only one resolves;
node3 depends on node0 ALONE, demonstrating a single producer
("node0") satisfying two different consumers' dependencies
("risultati condivisi... piu' consumer") -- node3 fully, node2
partially. 4/4 tests pass.
Scope for this milestone (decisions.log DEC-0008): dependency
COUNTING/readiness only, no direct producer-to-consumer value
forwarding (§11 frames that as a "quando possibile" optimization, not
a correctness requirement -- deferred until real bandwidth
measurements justify it) and no node-slot reclamation after dispatch
(not exercised by any scenario built so far).
Real synthesis: 0 CHECK problems, 763 LUT4/474 FF/0 DSP/0 CCU2C. Real
place&route (module fits the TRELLIS_IO budget as a bare top-level
this time, no harness needed): Fmax 155.30 MHz, PASS at 80MHz.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v
57 lines
2.9 KiB
Plaintext
57 lines
2.9 KiB
Plaintext
# V2 timing log -- solo append, mai troncato/sovrascritto (vedi README.md)
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# Nessuna entry ancora -- popolato incrementalmente man mano che avanza lo sviluppo V2.
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[2026-09-05] EXP-0001 -- neural_processor (P_IN=8, ACC_WIDTH=32)
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nextpnr-ecp5 --45k --package CABGA381 --speed 8 --freq 80
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--lpf-allow-unconstrained
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Fmax: 183.12 MHz -- PASS at 80 MHz (real place&route measurement)
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Critical path: job_ready -> TRELLIS_IO output pad (i.e. the design's
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own logic is NOT the bottleneck at this Fmax -- an unconstrained
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output pin dominates; a real system-level Fmax will differ once
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this signal is consumed on-chip instead of driven to a pad in
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isolation). Log: hardware/v2/synthesis/neural_processor_p8/nextpnr.log
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WNS/TNS: not reported by this nextpnr version in this invocation.
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[2026-09-05] EXP-0002 -- neural_processor (P_IN=8, ACC_WIDTH=24)
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Same command as above, ACC_WIDTH=24 build.
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Fmax: 176.21 MHz -- PASS at 80 MHz (real place&route measurement)
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Delta vs ACC_WIDTH=32: -6.91 MHz (-3.8%) despite FEWER resources --
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attributed to placement noise, not a real architectural effect
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(no seed sweep run to confirm either way -- see experiments.log
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EXP-0002 and benchmark.log). Log: hardware/v2/synthesis/
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neural_processor_p8_acc24/nextpnr.log
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[2026-09-05] EXP-0003 -- N_PROCESSORS sweep (P_IN=8), real nextpnr-ecp5
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--45k --package CABGA381 --speed 8 --freq 80 --lpf-allow-unconstrained
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N=1: Fmax=159.11 MHz PASS MULT18X18D 8/72 (11%)
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N=2: Fmax=149.59 MHz PASS MULT18X18D 16/72 (22%)
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N=4: Fmax=151.01 MHz PASS MULT18X18D 32/72 (44%)
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N=8: Fmax=134.70 MHz PASS MULT18X18D 64/72 (88%)
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TRELLIS_IO stays at 18/245 (7%) throughout (harness has only
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clk/rst/seed/checksum as real pins, by design -- see ERR-0005).
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See decisions.log DEC-0005: DSP, not Fmax or LUT/FF, is the resource
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that will first prevent scaling N_PROCESSORS further at P_IN=8.
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[2026-09-05] EXP-0004 -- default-depth buffer configs, real nextpnr-ecp5
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activation_buffer (D=4096): Fmax=325.20 MHz PASS
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weight_buffer (D=512): Fmax=339.67 MHz PASS
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result_buffer (D=4096): Fmax=325.20 MHz PASS
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All far above the 80MHz target -- buffers are not a timing concern in
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isolation at these depths.
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[2026-09-05] EXP-0005 -- memory_manager + prefetch_engine (via
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harness_memory_manager.v, see errors.log ERR-0005 for why a harness
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was needed), real nextpnr-ecp5 --45k --package CABGA381 --speed 8
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--freq 80 --lpf-allow-unconstrained
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Fmax: 165.86 MHz -- PASS at 80MHz (real place&route measurement)
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[2026-09-05] EXP-0006 -- neural_director (via harness_neural_director.v,
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see errors.log ERR-0005 for why), real nextpnr-ecp5 --45k --package
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CABGA381 --speed 8 --freq 80 --lpf-allow-unconstrained
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Fmax: 250.50 MHz -- PASS at 80MHz (real place&route measurement)
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[2026-09-05] EXP-0007 -- dependency_manager (N_NODES=16, standalone,
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no harness needed), real nextpnr-ecp5 --45k --package CABGA381
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--speed 8 --freq 80 --lpf-allow-unconstrained
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Fmax: 155.30 MHz -- PASS at 80MHz (real place&route measurement)
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