11-28-2011 08:43 PM
i have a board with EP2C8Q208 and a SDRAM for run NIOS2the SDRAM chip is K4S281632F 8MX16, but in the SDRAM controller dont show that device Can you help how set the SDRAM controller to that SDRAM ? https://www.alteraforum.com/forum/attachment.php?attachmentid=5130 https://www.alteraforum.com/forum/attachment.php?attachmentid=5131 https://www.alteraforum.com/forum/attachment.php?attachmentid=5132
11-28-2011 10:35 PM
The settings in the first window (Memory Profile) look correct (16 Bits, 1 Chip Select, 4 Banks, 12 Rows, 9 Columns)For the second window I would put: CAS latency cycles: 3 Init refresh cycles: 2 Refresh command every: 7.8125us (needs to refresh 8192 times in 64ms) Delay after power up: 200us (not given in the datasheet, but should be in the order of several 100s of us) t_rfc: 70ns t_rp: 20ns t_rcd: 20ns t_ac: 5.5ns t_wr: 15 t_rfc, t_ac and t_wr are guesses on my behalf, but it should work as most SDRAM chips of these specs follow the same parameters. If it doesn't work try increasing the values of those three.
11-28-2011 10:36 PM
my problem was the clock of SDRAM, this need some delay from main clocki tested with -3ns using Avalon ALTPLL for CycloneII, and EUREKA that work thanks a lot https://www.alteraforum.com/forum/attachment.php?attachmentid=5133