When using the Low Latency Ethernet 10G MAC Intel® FPGA IP, why does the avalon_st_rx_pfc_pause_data signal de-assert for only one clock cycle after receiving an XON request in Priority-based Flow Control (PFC) implementation?

Description

Due to a problem with the Intel® Quartus® Prime software version 18.0 and earlier, the Low Latency Ethernet 10G MAC Intel® FPGA IP's avalon_st_rx_pfc_pause_data signal is de-asserted for only one clock cycle after receiving an XON request in PFC implementations. The avalon_st_rx_pfc_pause_data signal continues to be asserted until the pause quanta expire or become zero.

Resolution

No workaround available. 

This problem has been fixed starting in the Intel® Quartus® Prime Pro version 18.1.