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Altera_Forum's avatar
Altera_Forum
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15 years ago

Problem SDRAM....Burst Terminate!!!

Hi all, Ok, I found out that SDRAM keeps writing forever and never stop, when I call IOWR_32DIRECT(...) in SignalTap. When I look at Dev Board Cyclone II and it does show Write and Bur...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi all,

I think I got my sys_clk right this time, I set sys_clk is 100mhz and sdram_clk is 133mhz.

In my Nios II

unsigned int i, w, r;

for (i=5; i<8; i++)

IOWR_32DIRECT(SDRAM_BASE, i, i);

for (i=5; i<8; i++)

r = IORD_32DIRECT(SDRAM_BASE, i);

I see the write seems to work 5, 6, and 7, but when I read it back. I get 0. When you look at SignalTap, you see CS, RAS, CAS, WE (L, H, L, H) is for read 0.

Geting close ...

Best regards,

Sean