thejayman77
6319d7ca85
Closes the last currently-visible EMIF-handshake -> FSM setup family the
Ch443c fit exposed (-0.043/-0.022/-0.005 ns), the read-response analogue
of the AW/W buffers.
- gs_axi_r_regbuf: one-entry FULLY-registered AXI R buffer (the R twin of
gs_axi_w_regbuf). Buffers the complete {rdata,rresp,rlast}; u_rready =
!full only (NO combinational dependence on the texture FSM's d_rready);
captures on u_rvalid && u_rready; d_rvalid = full with the payload held
stable until d_rvalid && d_rready; resets only . Inserted between
read-arbiter s2 and gs_texture_cache (u_texf_rbuf). The arbiter is
unchanged -- it completes its R transaction into the buffer, which then
owns delivery to the fill FSM. Cuts EMIF rvalid/rdata -> fst.F_R.
- gs_texture_cache: drop the unobservable fill_data_q reset. F_DRAIN (its
only reader) is reachable only after F_R loads it, so the reset value is
never observed; removing it kills the separate lock_sync|dreg[1] ->
fill_data_q[80] setup path (-0.005 ns).
- New tb_gs_axi_r_regbuf: exactly-once/in-order, randomized responses +
stalls, full backpressure, the full && d_rready no-fall-through case,
{rdata,rresp,rlast} stability, reset-while-empty AND reset-while-full.
All green: r-buffer TB, texture_cache, texture_psmt8_clut, scanout_lb,
scanout_restart, scanout_diag, ps2_hps_bridge, rd_arb, and the complete
f52 replay BYTE-IDENTICAL (Z 0/307200, COLOR 0/245760). No Quartus/board/
push from here.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
retroDE_ps2 Planning Docs
This directory is the working design scaffold for the PS2 core.
Purpose:
- define the intended repository shape before RTL lands,
- define subsystem boundaries before implementation choices harden,
- document what each block owns, what crosses the boundary, and how we will validate it.
Recommended reading order:
- repo_layout.md
- phase0_checklist.md
- contracts/README.md
- stub_module_plan.md
- wave2_dma_gif_plan.md
- wave25_memory_backed_dma_plan.md
- wave26_multi_beat_dma_plan.md
Relationship to references/:
references/is the research library.docs/is the project-definition layer.
Rule of thumb:
- If a file explains PS2 hardware as it exists, it belongs under
references/. - If a file explains how
retroDE_ps2intends to model, partition, or validate that hardware, it belongs underdocs/.