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Observer you3
Observer
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Registered: ‎11-01-2018

DMA /bridge subsystem for pci express descriptor error

i encounter a problem when using DMA /bridge subsystem for pci express ip core.

Since beginning C2H trasfer, linux(ubuntu16.04) driver sends descriptors that is correct in format in host ddr3 through driver checking  to DMA /bridge subsystem for pci express ip core but ip core register space C2H channel control register(0x1004) 's value show descriptor error which leads to ip core stoped by a way the completed descriptor number is  less than  configurable number by driver .  After Descriptor error by ip core checking ,ip core how to restore DMA transfer .

i wants to kow when ip core DMA tranfer generate descriptor error ,ip core how to solve.

hope someone help me 

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