thejayman77
27dfd0b0cf
Ch442's fit exposed two failing setup families (plus a stale max-skew). Attack both structurally; no reseeding. Family 1 - AWREADY -> Z-FSM (-0.410): gen_p2c_ff[23] (EMIF AWREADY) reached u_zc_emit|u_z's S_SFLUSH_AW/S_FILL_R next-state combinationally. Ch441 registered only the W channel; add the AW twin: - new gs_axi_aw_regbuf (one-entry fully-registered AW buffer), inserted in zc_emit between u_z's AW output and the arbiter s2 AW port. The FSM now sees registered occupancy, never EMIF's combinational AWREADY. Family 2 - texcache drain_idx_q -> tex_mem (-0.370, x7): a single index fanned across the whole 65536x32, 128-M20K macro. Split by WIDTH into four 65536x8 banks, each with its own (* preserve, dont_merge *) write- address launch register; write the four byte lanes together in F_WRITE; reconstruct the sample word by concatenating four registered read bytes. Selector structure and 1-cycle read latency unchanged; total M20Ks unchanged (4x32 == 128); fill_crc still sums the full 32-bit word. Max-skew: relax ONLY the Ch357 tile-write CDC set_max_skew 2.0 -> 2.5 (quasi-static bundle, >=2 dclk stability window); retain set_net_delay 2.0 (the real arrival bound). SDC comment updated. Tests: new tb_gs_axi_aw_regbuf (AW scoreboard: exactly-once/order/no- combinational-AWREADY-bypass/stable-while-stalled); tb_gs_texture_cache strengthened to distinct-per-byte-bank data + per-bank + full-word checks. All pass: aw/w regbuf, texture_cache, texture_psmt8_clut, scanout_diag, ps2_hps_bridge, and the complete f52 replay BYTE-IDENTICAL (Z 0/307200, COLOR 0/245760). No Quartus, board, or push from here. Ready for one owner GUI fit. 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/.