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GBA Memory: Prefetch timing changes

This commit is contained in:
Jeffrey Pfau 2015-06-19 04:25:01 -07:00
parent 2a6d79fee2
commit 833d81ee75
1 changed files with 14 additions and 12 deletions
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26
src/gba/memory.c
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@ -1270,21 +1270,23 @@ void GBAAdjustWaitstates(struct GBA* gba, uint16_t parameters) {
memory->waitstatesPrefetchNonseq32[REGION_CART1] = memory->waitstatesPrefetchNonseq32[REGION_CART1_EX] = memory->waitstatesNonseq32[REGION_CART1];
memory->waitstatesPrefetchNonseq32[REGION_CART2] = memory->waitstatesPrefetchNonseq32[REGION_CART2_EX] = memory->waitstatesNonseq32[REGION_CART2];
} else {
memory->waitstatesPrefetchSeq16[REGION_CART0] = memory->waitstatesPrefetchSeq16[REGION_CART0_EX] = 0;
memory->waitstatesPrefetchSeq16[REGION_CART1] = memory->waitstatesPrefetchSeq16[REGION_CART1_EX] = 0;
memory->waitstatesPrefetchSeq16[REGION_CART2] = memory->waitstatesPrefetchSeq16[REGION_CART2_EX] = 0;
// Assume it stalls one cycle to pull a value from the prefetch
// This needs more research to tell if it's accurate or not
memory->waitstatesPrefetchSeq16[REGION_CART0] = memory->waitstatesPrefetchSeq16[REGION_CART0_EX] = 1;
memory->waitstatesPrefetchSeq16[REGION_CART1] = memory->waitstatesPrefetchSeq16[REGION_CART1_EX] = 1;
memory->waitstatesPrefetchSeq16[REGION_CART2] = memory->waitstatesPrefetchSeq16[REGION_CART2_EX] = 1;
memory->waitstatesPrefetchSeq32[REGION_CART0] = memory->waitstatesPrefetchSeq32[REGION_CART0_EX] = 0;
memory->waitstatesPrefetchSeq32[REGION_CART1] = memory->waitstatesPrefetchSeq32[REGION_CART1_EX] = 0;
memory->waitstatesPrefetchSeq32[REGION_CART2] = memory->waitstatesPrefetchSeq32[REGION_CART2_EX] = 0;
memory->waitstatesPrefetchSeq32[REGION_CART0] = memory->waitstatesPrefetchSeq32[REGION_CART0_EX] = 2;
memory->waitstatesPrefetchSeq32[REGION_CART1] = memory->waitstatesPrefetchSeq32[REGION_CART1_EX] = 2;
memory->waitstatesPrefetchSeq32[REGION_CART2] = memory->waitstatesPrefetchSeq32[REGION_CART2_EX] = 2;
memory->waitstatesPrefetchNonseq16[REGION_CART0] = memory->waitstatesPrefetchNonseq16[REGION_CART0_EX] = 0;
memory->waitstatesPrefetchNonseq16[REGION_CART1] = memory->waitstatesPrefetchNonseq16[REGION_CART1_EX] = 0;
memory->waitstatesPrefetchNonseq16[REGION_CART2] = memory->waitstatesPrefetchNonseq16[REGION_CART2_EX] = 0;
memory->waitstatesPrefetchNonseq16[REGION_CART0] = memory->waitstatesPrefetchNonseq16[REGION_CART0_EX] = 1;
memory->waitstatesPrefetchNonseq16[REGION_CART1] = memory->waitstatesPrefetchNonseq16[REGION_CART1_EX] = 1;
memory->waitstatesPrefetchNonseq16[REGION_CART2] = memory->waitstatesPrefetchNonseq16[REGION_CART2_EX] = 1;
memory->waitstatesPrefetchNonseq32[REGION_CART0] = memory->waitstatesPrefetchNonseq32[REGION_CART0_EX] = 0;
memory->waitstatesPrefetchNonseq32[REGION_CART1] = memory->waitstatesPrefetchNonseq32[REGION_CART1_EX] = 0;
memory->waitstatesPrefetchNonseq32[REGION_CART2] = memory->waitstatesPrefetchNonseq32[REGION_CART2_EX] = 0;
memory->waitstatesPrefetchNonseq32[REGION_CART0] = memory->waitstatesPrefetchNonseq32[REGION_CART0_EX] = 2;
memory->waitstatesPrefetchNonseq32[REGION_CART1] = memory->waitstatesPrefetchNonseq32[REGION_CART1_EX] = 2;
memory->waitstatesPrefetchNonseq32[REGION_CART2] = memory->waitstatesPrefetchNonseq32[REGION_CART2_EX] = 2;
}
cpu->memory.activeSeqCycles32 = memory->waitstatesPrefetchSeq32[memory->activeRegion];