dram.c

三星2413芯片的测试代码,对进行驱动开发很有帮助.

#include "Option.h"
#include "2413addr.h"
#include "DRAM.h"

void PreChangeSDRAMParameter(void)
{
	SetREFRESH(0x20);
	
	SetPARAMETER( 0xf, 0xf, 0x3, 0x3);
	
}

void ChangeSDRAMParameter(unsigned int hclk)
{

	int ras, rc, rcd, rp;

    ras = (int)(tRAS/(1000000/(hclk/1000000.)))+1-1;
    rc = (int)(tRC/(1000000/(hclk/1000000.)))+1-1;
    rcd = (int)(tRCD/(1000000/(hclk/1000000.)))+1-1;
    rp = (int)(tRP/(1000000/(hclk/1000000.)))+1-1;
	
	SetREFRESH((tREFRESH/100.)*hclk/1000000);
	SetPARAMETER( ras, rc, rcd, rp);
	
}