thejayman77
dd7ca4fb8e
Cuts the lone remaining EMIF setup fail (-0.016 ns, -0.259 skew): the combinational EMIF gen_p2c_ff -> wr_arb s2_wready -> gs_lpddr_z_rmw next-state (st, endpoint labelled S_FILL_R via the shared encoded state register). New gs_axi_w_regbuf: fully-registered one-entry W buffer (Option B per Codex). - u_wready = !full ONLY (registered occupancy) -> EMIF WREADY never reaches the Z FSM combinationally. NOT a fall-through skid (no !full-OR-d_wready term). - Buffers WDATA/WSTRB/WLAST; downstream held stable until accepted; exactly-once. - AW/B untouched; arbiter bready_q unchanged (still arms on real EMIF W handshake). - z_rmw may enter B-wait once the beat is buffered -- safe: EMIF cannot return B until the buffered beat reaches it. Single-beat writes -> the 1-beat/2-cycle buffer rate is far above the Z write rate (no new FIFO pressure). Wired in zc_emit between u_z W output (zi_*) and the z_w* ports. New file in sim Makefile RTL_SRCS + synth QSF (both). Focused tb_gs_axi_w_regbuf: exactly-once/order/ payload scoreboard + no-combinational-bypass check (u_wready===!full incl. full && d_wready) + downstream-stable check; standalone target + in make run. Texture-cache +0.016 paths NOT touched. No simulations or Quartus run. 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/.