Why does my V-Series Avalon®-MM DMA for PCIe hang with Txs_waitrequest low?

Description

You will see this behavior if you accidentally issue a DMA request for zero bytes.  The request is correctly sent to the host but will be ignored causing the Hard IP for PCI Express to hang waiting on a response from the host.

Resolution

To correct this, ensure that all DMA requests are > 0 bytes.