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Honored Contributor
Honored ContributorSDRAM does not retain data
I have a custom board with an altera EP1C12, a flash memory and a MT48LC4M32B2 SDRAM memory. Timings I set in SOPC builder are the default timings for this part. When I set the value 0x00000000 ...
Altera_ForumHonored Contributor
Honored ContributorSlacker, I'm not using a data cache (I'm using Nios II/e) so I don't need to use uncached memory.
I tried using IORD/WR instructions and the result is the same:#include <io.h># include <stdio.h># include "system.h"
int main()
{
long i,j,k;
long test,last;
long values;
long times;
for(i=0;i<32;i++)
{
values=0;
times=0;
}
for(i=0;i<10;i++)
printf("Hello From Nios\n\n");
// sdram=0x00000000;
IOWR_32DIRECT(SDRAM_BASE, 3578, 0x00000000);
last=0;
i=0;
j=0;
while(1)
{
//test=sdram;
test=IORD_32DIRECT(SDRAM_BASE, 3578);
if(test!=last)
{
times=i;
values=test;
last=test;
j++;
}
if (test==0xffffffff)
{
for(k=0;k<32;k++)
printf("\nTime:%8ld us Value: %8x",times,values);
break;
}
usleep(i);
i+=1; //INCREMENT x us
}
return 0;
}
