Roflin
7df0c97c78
bba_top derived its EXI clock from HALF, defaulting to 3.4 MHz against the real GC's ~27 MHz. At that rate the whole CDC response latency fits inside one bit time, so the suite passed green on a design that failed on console -- this is how both the wrong-header-format and the TX-pop-threshold bugs reached hardware with everything green. HALF is now EXI_HALF-configurable (default 8 for fast regression). At the real rate, EXI_HALF=1, every read comes back shifted right by ONE BIT: 04 02 02 00 -> 02 01 01 00, NWAYS 0x17 -> 0x0B. That is a bit-level sampling misalignment, not the byte-level latency chased earlier: at 54 MHz capture there are only 2 ticks per EXI bit and the 2-stage FFSynchronizer on EXI CLK costs 2 ticks, a whole bit. Recorded as an open bug in CLAUDE.md with the measurements. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>