Some CPRI IP Core Variations That Target an Arria V GX Device Do Not Achieve Timing Closure

Description

CPRI IP core variations with a CPRI line rate of 4.9152 Gbps or 6.144 Gbps that target an Arria V GX device may fail to achieve timing closure with the default Quartus II Fitter settings. Specifically, they may experience hold time violations on the PCS-PLD path.

Resolution

To achieve better timing closure results, perform one of the following actions:

• Add set_min_delay assignments to overconstrain timing.
• Try different Quartus II Fitter seeds.

This issue will be fixed in a future version of the CPRI MegaCore function.