issue: close scoreboard issue-stage timing at NT16#372
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Fold per-FU dispatch-queue back-pressure (fu_goingfull) and the FU-lock serialization into the registered operands_ready, so the arbiter request is a pure flop; fu_locked_n consults the next-state so it stays bit-exact. Share in_use_mask between the busy check and operand trace, and replace the selection with a cyclic arbiter. Add the VX_CFG_DISPATCH_QUEUE_SIZE credit knob (default 4) with dispatcher/issue-slice fu_release plumbing. Also: DUT synth-flow fixes (project.tcl/xdc clock knob, scoped async_bram_patch, xrt Makefile) and coding-guideline doc tweaks. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Select the issue arbiter by requester count via VX_generic_arbiter (matrix above 8, round-robin at or below) so grant logic stays shallow at NW16, and serialize multi-uop FU sequences with a single registered lock mask gating the arbiter requests instead of the per-FU locked state. Remove the unused suppress port from VX_gto_arbiter and its tie-off in VX_generic_arbiter. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Closes the scoreboard issue-stage critical path at NT=NW=16 on the U55C @ 300 MHz.
What
operands_readya clean flop; look-ahead/credit folding).VX_generic_arbiter— matrix above 8 requesters, round-robin at or below — so grant logic stays shallow at NW16.suppressport fromVX_gto_arbiterand its tie-off inVX_generic_arbiter.Validation
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