thejayman77
547811e89b
The 8K request FIFO was 8x oversized (measured peak ~478; Codex's TB uses 1024). Its read address routed to 8 spread M20K blocks -> 310MHz EMIF setup miss (-0.103, MAX_FANOUT can't help: Quartus refuses to duplicate RAM-address regs, Warning 22471). Shrinking to 1024 (2 blocks): 26.1 fit shows that path GONE, design clk +0.631->+5.693, RAM 309/358 (86%) -> 277/358 (77%). New worst is a DIFFERENT, skew-dominated EMIF-> texcache-FSM path at -0.074 (TNS -2.032 -> -0.164). SAFETY GATE before board load: confirm the full zsrt139f52 scene never bursts >1024 Z-requests in flight (peak I have is 478 from a smaller scene). Bump to 2048 if unsure. 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/.