This depends on how you control the Descriptor controller to initial DMA transfer. If this is your custom DMA descriptor controller, you probably can add some logic at the endpoint to control the DMA.
The Descriptor controller is basically the brain of the whole DMA, and responsible to provide the descriptors to the movers to start the data transfer. This is not within the PCIe hard IP, you can use the descriptor controller that comes with the IP/reference design or you can build it on your own in order to have better control of it.
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