write & read SDRAM chip

[Altera_Forum]

hi all 

I try to read and write the external 8M SDRAM chip. At the Nios II IDE, my system library and "Linker Script" with program memory(.text), Read-only data memory(.rodata), Read/Write data memory (.rwdata), Heap memory, Stack memory all setting another RAM chip "sram_0". My program is below: # include <stdio.h># include <alt_types.h># include <io.h># include <system.h># include <string.h># include "system.h"  int main(void) {  unsigned int value = 0;  unsigned int pattern = 0x10;  unsigned int i, memory_size;    memory_size = 0x800; //SDRAM actual size is 0x7FFFFF     for(i = 0; i< memory_size; i=i+0x10)  {   IOWR_16DIRECT((SDRAM_0_BASE), i, pattern);    value = IORD_16DIRECT((SDRAM_0_BASE), i);    printf("%d,%d\n", i,value);  }  return 0;  }  but in the Console with result is only display 6 data: 0,16 16,16 32,16 48,16 64,16 80,16  Could anyone tell me where it is fault ? At the SOPC Builder->More Settings->Exception Address & Memodule my setting is sdram_0. is this need change to sram_0 or not ? http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/blink.gif

[Altera_Forum]

You&#39;ve answered it, yourself. You&#39;re writing over the code at your Exception Address (starting at offset 0x20) in your SDRAM. 

 Cheers,  - slacker

[Altera_Forum]

--- Quote Start ---  originally posted by slacker@Jun 2 2006, 12:02 AM you&#39;ve answered it, yourself.  you&#39;re writing over the code at your exception address (starting at offset 0x20) in your sdram.  cheers,  - slacker <div align='right'><{post_snapback}> (index.php?act=findpost&pid=15784)  --- quote end ---    --- Quote End ---     hi slacker The problem has already been solved  thanks for your reply

[Altera_Forum]

--- Quote Start ---  originally posted by suway1219+jun 2 2006, 02:00 am--><div class='quotetop'>quote (suway1219 @ jun 2 2006, 02:00 am)</div>  --- quote start ---  <!--quotebegin-slacker@Jun 2 2006, 12:02 AM you&#39;ve answered it, yourself.  you&#39;re writing over the code at your exception address (starting at offset 0x20) in your sdram.  cheers,  - slacker <div align='right'><{post_snapback}> (index.php?act=findpost&pid=15784)  --- quote end ---    --- Quote End ---     hi slacker The problem has already been solved  thanks for your reply <div align='right'><{post_snapback}> (index.php?act=findpost&pid=15785)</div> [/b]  --- Quote End ---    Hi,suway1219  I will write and read data from SDRAM. so, can you give a complete example?  thx again.  Regards Faye