DMA for Read/Write simultaneously [Revisit]

Thanks for everyone’s help. Now I set up a DMA adapter with two device
objects for R/W. It looks like to me even though I can queue a read while a
write is in effect, that read won’t start until I free map registers in my
write DPC; ie, the wtite DMA is done. In other words, it is still a
sequential order. Since both reads/writes require staged transfers, my
original idea queuing staged reads and writes. Is it doable or something I


Ta H.

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