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thejayman77 ec82764bef Initial commit: retroDE_ps2 — first-of-its-kind PS2 GS FPGA core (DE25-Nano / Agilex 5) 
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>
2026-06-29 20:10:50 -04:00

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Peripheral Contract

Status: Draft

Purpose

Group the console-completeness devices that are neither CPU cores nor the main graphics/audio engines.

In scope

  • CDVD
  • SIO2
  • memory cards
  • controller-facing console semantics
  • DEV9
  • USB
  • FireWire

Owns

  • register-visible behavior for these devices,
  • media/card/controller presence semantics,
  • protocol translation where the retroDE platform provides host assistance.

Questions to lock

  • Which peripherals are required for the first three milestones?
  • Which peripherals will be HPS-assisted versus locally modeled?
  • Is controller input presented first through a simplified abstraction or through SIO2-faithful transactions?

Allowed early stubs

  • device-present/device-absent reporting only,
  • fixed media status responses,
  • controller event injection through simplified paths,
  • memory card placeholder presence with no persistence.

Likely implementation order

  1. SIO2/controller minimum
  2. memory card minimum
  3. CDVD minimum
  4. DEV9/USB/FireWire as later completeness work
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