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micheleandClaude Sonnet 5 50c940a41d docs: real, full P&R for N=16 hybrid systolic system -- timing NOT met (EXP-0093)

Real place_design/route_design against XC7A100T-CSG324-2: post-route
utilization holds (128 DSP48E1/53.33%, matching EXP-0091's projection),
but real timing fails on clk_pll_i (155.039MHz): WNS=-0.913ns,
WHS=+0.029ns, 3021 failing setup endpoints. Root-caused to
sdram_arbiter_n.v's req_wdata mux, now a real 20/21-way select (up
from 3-way at N=2) feeding mig_native_adapter.v's wdata_lat_reg.

N=16 is functionally correct (EXP-0092) but not yet timing-closed --
honestly not ready for real hardware at the target clock. N=2
(EXP-0088) remains the trustworthy, deployable signoff. Real options
for closing timing documented as next_action, not yet attempted.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MUG92aM9m68TRc4rG55BcC

2026-09-21 00:41:17 +02:00

constraints

docs+synth: Phase 0 baseline (N_SLOTS=4, real board top), fix stale LPF freq

2026-09-15 20:28:16 +00:00

ddr3

exp: N=16 timing closure fixed (EXP-0056), weight-reuse gives real 7.16x memory speedup without DDR3 (EXP-0057)

2026-09-16 12:01:11 +02:00

docs

docs: extract V2 datasheet into submodule

2026-09-16 23:03:43 +02:00

logs

docs: real, full P&R for N=16 hybrid systolic system -- timing NOT met (EXP-0093)