Why does Qsys state that the minimum clock frequency for the csr_clk in the Arria 10 Low Latency Ethernet 10G MAC IP core is 156.25MHz?

Description

In the Quartus® Prime software release 15.1 and earlier, Qsys incorrectly reports a minimum frequency of 156.25MHz for the csr_clk in the Arria® 10 Low Latency Ethernet 10G MAC IP core.

Resolution

The csr_clk in the Arria 10 Low Latency Ethernet 10G MAC IP core must have a frequency of 156.25MHz or lower.

This problem is scheduled to be resolved in a future release of the Quartus Prime software.