thejayman77
471c1af9cd
Ch440: gs_async_fifo QUAD_WIDTH4_READ (2 depth x 4 width) for Z-req FIFO [READY FOR REVIEW]
...
Candidate 2 from the accepted structural proposal. Adds a QUAD_WIDTH4_READ
generate branch to gs_async_fifo: like QUADRANT_READ (2 depth x 2 width) but
splits the payload into FOUR width banks, so each preserved read-address launch
register drives ~half the M20K load (targets the 310MHz raddr_hi1_q->mem_hi1
setup family, WNS -0.103). Keeps QUADRANT_READ's proven 2:1 depth OUTPUT selector
unchanged (no new/deeper mux, per the doc's warning). Depth (8192), one-cycle
read latency, ordering, CDC, capacity, and interface are identical.
zc_emit u_req switched QUADRANT_READ->QUAD_WIDTH4_READ. New default-off param
leaves the other two gs_async_fifo instances byte-identical. TB gains a
TEST_QUAD_WIDTH4 variant + standalone Makefile target tb_gs_async_fifo_quad_width4.
NO simulations or Quartus run (per authorization). Awaiting review before any sim.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com >
2026-07-21 10:19:09 -04:00
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