Why devices faster than 533MHz require manual derating? - Why devices faster than 533MHz require manual derating? Description In the DDR3 SDRAM Controllers with ALTMEMPHY IP MegaCore® functions version 10.1 and earlier, the controller provides automatic derating based on the AC175 threshold. Memory devices faster than 533 MHz require derating based on the AC150 threshold. Affected Configurations This issue affects all configurations using memory devices faster than 533 MHz. Design Impact This issue can result in inaccurate timing analysis. Solution Status This issue is fixed in the DDR3 SDRAM Controllers with ALTMEMPHY IP MegaCore function version 11.0 . Resolution To workaround this issue, you need to calculate derated setup and hold values for your memory device, and enter those values in the DDR3 SDRAM Controller with ALTMEMPHY parameter editor. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] 11.0 10.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']