What are the AC voltage levels that Quartus® II uses for DDR2 and LPDDR2 tDS and tIS set up derating ? - What are the AC voltage levels that Quartus® II uses for DDR2 and LPDDR2 tDS and tIS set up derating ? Description The AC voltage levels depend on the value set in the Memory Parameters tab -> Memory Device Speed Grade and are shown below. DDR2 AC250 for speed grades 200.0 & 266.667. AC200 for speed grades 333.333, 400.0 & 533.333. LPDDR2 AC300 for speed grade 200.0. AC220 for speed grades 266.667, 333.333, 400.0 & 533.333. In the Memory Timing tab, the values for parameters tIS (base) and tDS (base) should be selected from the external memory vendor device datasheet for the memory device speed grade (DDR2) or the data rate corresponding to the memory device speed grade (LPDDR2). Resolution This information is scheduled to be added to a future version of the External Memory Interface Handbook. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Arria® V GT FPGA', 'Arria® V GX FPGA', 'Arria® V GZ FPGA', 'Arria® V ST FPGA', 'Cyclone® V E FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA', 'Stratix® III FPGAs', 'Stratix® IV E FPGA', 'Stratix® IV GT FPGA', 'Stratix® IV GX FPGA', 'Stratix® V E FPGA', 'Stratix® V GS FPGA', 'Stratix® V GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']