USB DMA transfter stopped for Altera Cyclone V.

I'm not a USB expert but I looked up these registers and this is what I found:

GRXFSIZ (RX FIFO Size Register) --> RX FIFO depth[13:0]

GNPTXFSIZ (Non-periodic TX FIFO Size Register) -->TX FIFO Size 0 [29:16] : TX FIFO start address 0 [13:0] *** you should set the TX FIFO start address 0 to be RX FIFO depth ***

HPTXFSIZ (Periodic TX FIFO Size Register) --> TX FIFO Size 1 [29:16] : TX FIFO start address 1 [14:0] *** you should set the TX FIFO start address 1 to RX FIFO depth + TX FIFO Size 0 ***

So essentially you are setting up the size and start address of three FIFOs inside the internal SRAM in the USB core. At offset 0 in the SRAM is the RX FIFO, followed by the non-periodic tx FIFO, followed by the period TX FIFO.

I recommend opening a service request and copying the link to this post into it: http://www.altera.com/mysupport Ask for additional information on the HPS USB core and we should be able to provide you with that information.