Type: Answers, Errata

Area: EMIF, Intellectual Property



For DDR3 SDRAM Controller with UniPHY and DDR3 SDRAM Controller with ALTMEMPHY IP, Devices Faster than 533MHz Require Manual Derating

Description

The DDR3 SDRAM Controller with UniPHY and the DDR3 SDRAM Controller with ALTMEMPHY provide automatic derating based on the AC175 threshold. Memory devices faster than 533 MHz require derating based on the AC150 threshold.

Workaround/Fix

For DDR3 SDRAM Controller with UniPHY, you should calculate derated setup and hold values for your memory device, and enter those values in the DDR3 SDRAM Controller with UniPHY parameter editor.

For DDR3 SDRAM Controller with ALTMEMPHY, you should calculate derated setup and hold values for your memory device, and enter those values in the DDR3 SDRAM Controller with ALTMEMPHY parameter� editor.