micheleandClaude Sonnet 5
bd1fb5dc14
Adds neural_director_grouped.v, a direct extension of neural_director_ packed.v's own already-proven 2-position pairing discipline to 8-position octets (matching systolic_group.v's fixed 4 PEs x 2 lanes). Real, deliberate finding: the host-facing SPI/WRITE_JOB submission protocol needs zero changes -- the host just submits 8 jobs sharing a weight base instead of 2, the same real pattern already required today. Real out-of-context synthesis of one systolic_group.v: 32 DSP48E1 (13.3%), confirming the original brainstorm's own DSP projection exactly. Found and fixed two real bugs: (1) a wraparound-arithmetic width bug in the octet index computation (same class already flagged for address math elsewhere in this project -- needs N+1 bits before the mod-reduce compare, not N); (2) a real, generalizable testbench race -- driving stimulus on the same clock edge the DUT samples on works fine with a natural gap between pulses (every prior testbench in this project has one) but silently double-registers data when called back-to-back with zero gap, confirmed via real signal tracing. Fixed with @(negedge clk) stimulus; CLAUDE.md's existing blocking/nonblocking testbench-race lesson extended to cover this new trigger. Verified via tb_neural_director_grouped.v: 4/4 PASS (octet dispatch + per-PE addressing, stall-not-mis-dispatch on a mismatched octet, queue wraparound). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MUG92aM9m68TRc4rG55BcC