Downstream Memory Reads (MRds) Fail for Arria V Hard IP for PCI Express

Description

Downstream memory reads (MRds) fail for all variants of the Arria V Hard IP for PCI Express IP core. No MRd TLP is generated on the Avalon Streaming (Avalon-ST) RX bus.

Resolution

The workaround is to drive the rx_st_mask signal with application logic or from an input pin instead of connecting it to ground. Connecting rx_st_mask to application logic or an input pin prevents the Quartus II software from removing rx_st_mask during optimization. For more information about the rx_st_mask signal, refer to the Arria V Hard IP for PCI Express User Guide.

This issue is fixed in version 12.0 of the Quartus II software.