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feat(timing): implement nominal Game Pak opcode prefetch

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0xrsydn 2026-10-06 20:32:54 +07:00
commit 8f22092e06
25 changed files with 1062 additions and 124 deletions
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docs/research/dma-resume-timing.md
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@ -56,7 +56,7 @@ No extra access is appended. A resumed ROM branch can therefore cost more than i
The later [sequencing extension](fetch-access-sequencing.md) applies each instruction's data/internal effects to the following source fetch.
CPU history, DMA resume, and ROM page boundaries can all require N without duplicating an access.
A completed transfer after DMA can establish a new N requirement for the following fetch.
Game Pak prefetch remains unimplemented; WAITCNT bit 14 does not alter this nominal timing path.
This baseline preceded active prefetch. The later [nominal queue](gamepak-prefetch.md) can satisfy an N resume request from queued code.
This change does not select a DMA value for CPU open-bus reads.
DMA channel data, persistent local IWRAM lanes, and protected BIOS history remain separate.