Device Family: Stratix® III, Stratix® IV E, Stratix® IV GX

Type: Answers

Area: EMIF, Intellectual Property


IP Product: DDR3 SDRAM Controller MegaCore supporting UniPHY

Why has the UniPHY CSR interface access latency increased in 11.0 and later version of the IP compared to 10.1 version of the IP?

Description

An increase in access is expected in 11.0 and later version of the IP due to the change in Configuration and Status Register (CSR) architecture. Before 11.0 version, Avalon-MM interface from the controller was exposed to the PHY, but in 11.0 and later version, Avalon-MM bridge and merlin fabric is used to export the Avalon-MM interface along with the PHY CSR.

Workaround/Fix