# V2 timing log -- solo append, mai troncato/sovrascritto (vedi README.md)
# Nessuna entry ancora -- popolato incrementalmente man mano che avanza lo sviluppo V2.

[2026-09-05] EXP-0001 -- neural_processor (P_IN=8, ACC_WIDTH=32)
nextpnr-ecp5 --45k --package CABGA381 --speed 8 --freq 80
  --lpf-allow-unconstrained
Fmax: 183.12 MHz -- PASS at 80 MHz (real place&route measurement)
Critical path: job_ready -> TRELLIS_IO output pad (i.e. the design's
  own logic is NOT the bottleneck at this Fmax -- an unconstrained
  output pin dominates; a real system-level Fmax will differ once
  this signal is consumed on-chip instead of driven to a pad in
  isolation). Log: hardware/v2/synthesis/neural_processor_p8/nextpnr.log
WNS/TNS: not reported by this nextpnr version in this invocation.

[2026-09-05] EXP-0002 -- neural_processor (P_IN=8, ACC_WIDTH=24)
Same command as above, ACC_WIDTH=24 build.
Fmax: 176.21 MHz -- PASS at 80 MHz (real place&route measurement)
Delta vs ACC_WIDTH=32: -6.91 MHz (-3.8%) despite FEWER resources --
  attributed to placement noise, not a real architectural effect
  (no seed sweep run to confirm either way -- see experiments.log
  EXP-0002 and benchmark.log). Log: hardware/v2/synthesis/
  neural_processor_p8_acc24/nextpnr.log

[2026-09-05] EXP-0003 -- N_PROCESSORS sweep (P_IN=8), real nextpnr-ecp5
--45k --package CABGA381 --speed 8 --freq 80 --lpf-allow-unconstrained
N=1: Fmax=159.11 MHz PASS   MULT18X18D 8/72 (11%)
N=2: Fmax=149.59 MHz PASS   MULT18X18D 16/72 (22%)
N=4: Fmax=151.01 MHz PASS   MULT18X18D 32/72 (44%)
N=8: Fmax=134.70 MHz PASS   MULT18X18D 64/72 (88%)
TRELLIS_IO stays at 18/245 (7%) throughout (harness has only
clk/rst/seed/checksum as real pins, by design -- see ERR-0005).
See decisions.log DEC-0005: DSP, not Fmax or LUT/FF, is the resource
that will first prevent scaling N_PROCESSORS further at P_IN=8.

[2026-09-05] EXP-0004 -- default-depth buffer configs, real nextpnr-ecp5
activation_buffer (D=4096): Fmax=325.20 MHz PASS
weight_buffer (D=512):      Fmax=339.67 MHz PASS
result_buffer (D=4096):     Fmax=325.20 MHz PASS
All far above the 80MHz target -- buffers are not a timing concern in
isolation at these depths.

[2026-09-05] EXP-0005 -- memory_manager + prefetch_engine (via
harness_memory_manager.v, see errors.log ERR-0005 for why a harness
was needed), real nextpnr-ecp5 --45k --package CABGA381 --speed 8
--freq 80 --lpf-allow-unconstrained
Fmax: 165.86 MHz -- PASS at 80MHz (real place&route measurement)