DMA Controller: L1Cache - L2Cache - Directory - DMA - AccelL1Cache - AccelL2Cache - GPUCopyDMA - CrossingGuard

ReadRequest WriteRequest Data Ack
READY s p / BUSY RD s p / BUSY WR     READY
BUSY RD     d p / READY   BUSY RD
BUSY WR       a p / READY BUSY WR
ReadRequest WriteRequest Data Ack