thejayman77
ec82764bef
RTL (GS rasterizer, EE core stub, platform bridge, LPDDR4B path), sim regression (272 TBs), docs, and tooling. Copyrighted PS2 content (BIOS, game code, GS dumps, and all dump-derived textures/traces) is excluded via .gitignore and stays local. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
1.0 KiB
1.0 KiB
SIF Contract
Status: Draft
Purpose
Define the communication contract between EE and IOP.
Owns
- SIF register behavior visible on both sides,
- mailbox/flag exchange,
- DMA-linked data movement endpoints,
- synchronization semantics required by BIOS and basic software.
Inputs
- EE-side register writes and DMA requests,
- IOP-side register writes and DMA requests,
- reset and interrupt-state changes.
Outputs
- flag and mailbox visibility on both sides,
- DMA endpoint readiness/traffic,
- trace events.
Questions to lock
- What minimum SIF behavior is required before BIOS reaches meaningful IOP boot?
- Can early milestones use a narrower command subset?
- How will SIF traces be correlated between EE and IOP timelines?
Allowed early stubs
- mailbox/flag-only implementation,
- reduced DMA payload path,
- synchronous fake acknowledgements for platform smoke tests.
Required debug visibility
- MSCOM/SMCOM writes,
- flag transitions,
- SIF DMA starts/completions,
- mismatched or stalled handshakes.