DSP5509A用EMIF接口扩展外设时，地址是如何映射的

您好，谢谢您的回复，主程序如下：
//keyboard code
#include "myapp.h"
#include <csl.h>
#include <csl_pll.h>
#include <csl_chip.h>
#include <csl_gpio.h>
#include <stdio.h>
#include <stdlib.h>
#include <csl_irq.h>
#include <csl_mcbsp.h>

#define ST1_55 *(int *)0x03
#define ST3_55 *(int *)0x04
// 定义指示灯寄存器地址和寄存器类型
#define LBDS1 (*((unsigned int *)0x601000))
#define keyboard (*((unsigned int *)0x600400))
#define GPIO_SEL (*((unsigned int *)0x400000))
// 子程序接口
void Delay(unsigned int nDelay); // 延时子程序

unsigned int time=0;
unsigned int temp_key,temp_key1;
unsigned int keycode[100];

main()
{
// unsigned int uLED[5]={0,1,2,4,0xFF}; // 控制字，逐位置1: 0001B 0010B 0100B 1000B
unsigned int uLED[10]={0x0db,0x50,0x6b,0x73,0x0f0,0x0b3,0x0bb,0x51,0x0fb,0x0f3};

CLK_init(); // 初始化DSP运行时钟
ST3_55 = ST3_55|0x0040; //定义CE3的映射,禁止片内ROM
SDRAM_init(); // 初始化EMIF接口

GPIO_SEL=0;

while ( 1 )
{
temp_key=keyboard;
temp_key=temp_key & 0x00ff;
if(0xff!=temp_key)
{
temp_key1=temp_key;
Delay(20);
temp_key=keyboard;
temp_key=temp_key & 0x00ff;
if(temp_key == temp_key1)
{
//time++;
//keycode[time]=temp_key;

switch(temp_key)
{
case 0x0fb:
LBDS1=0x0ff-uLED[2]; //s202
break;
case 0x0f7:
LBDS1=0x0ff-uLED[3];//
break;
case 0x0ef:
LBDS1=0x0ff-uLED[4];
break;
case 0x0df:
LBDS1=0x0ff-uLED[5];
break;
case 0x0bf:
LBDS1=0x0ff-uLED[6];
break;
case 0x07f:
LBDS1=0x0ff-uLED[7];
break;
case 0x0fd:
LBDS1=0x0ff-uLED[1];
break;
case 0x0fe:
LBDS1=0x0ff-uLED[0];
break;
default:break;
}

}
}
}
}

void Delay(unsigned int nDelay)
{
unsigned int ii,jj,kk=0;
for ( ii=0;ii<nDelay;ii++ )
{
for ( jj=0;jj<2048;jj++ )
{
kk++;
}
}
}

在原理图里键盘是连在SN74HC245上的，当CE3与A11均为1的时候SN74HC245片选信号有效