C6416 FLASH

最近在做6416的FLASH调试，出现的问题和你的很像，就是写不进去，FLASH芯片为AM29LV160B，目前手头有两块板（都是自己做的PCB），一块是按16bit位宽连接的EMIFA的CE0，可以正常读写；一块是按8bit位宽连接的EMIFB的CE1，死活没法写，读出的数据全是FF！目前已经测试芯片管脚的CE，OE，WE，RESET,BYTE等信号，还没发现问题！跪求各位老师、专家给点建议和指导啊！谢谢！

Shine：

看一下是不是没有满足Flash写的时序要求？试试在flash write命令后多等些时间再写下一个数。

qinbiao yang：

回复 Shine:

我在执行完一个写操作之后是回读写入的数据，看读出的数据是否等于写入的数据，如果不等于的话就一直等待，然后读出的数据就一直是FF，过不去了！控制CE的寄存器的那些等待时间我基本都设置成最大了！我用几乎相同的代码读写16bit连接方式的FLASH是可以的，我也用示波器测试了FLASH相应管脚上的信号时序，感觉也看不出明显错！有没有一些检测硬件好坏的测试方法啊？确定是不是硬件有问题呢！谢谢啊

Tony Tang：

回复 qinbiao yang:

检查一下你的两个flash的命令是否有区别。

下面是我在C6416上测试过的nor flash相关代码:

typedef unsigned int FLASH_DATA_TYPE;

#define FlashBaseAddr 0x064000000 //EMIFB CE1， COPY TO ADDRESS 0.void Init_Emif(){ #define EMIFA_GCTL 0x01800000 #define EMIFA_CE1 0x01800004 #define EMIFA_CE0 0x01800008 #define EMIFA_CE2 0x01800010 #define EMIFA_CE3 0x01800014 #define EMIFA_SDRAMCTL 0x01800018 #define EMIFA_SDRAMTIM 0x0180001c #define EMIFA_SDRAMEXT 0x01800020 #define EMIFA_CE1SECCTL 0x01800044 #define EMIFA_CE0SECCTL 0x01800048 #define EMIFA_CE2SECCTL 0x01800050 #define EMIFA_CE3SECCTL 0x01800054

#define EMIFB_GCTL 0x01A80000 #define EMIFB_CE1 0x01A80004 #define EMIFB_CE0 0x01A80008 #define EMIFB_CE2 0x01A80010 #define EMIFB_CE3 0x01A80014 #define EMIFB_SDRAMCTL 0x01A80018 #define EMIFB_SDRAMTIM 0x01A8001c #define EMIFB_SDRAMEXT 0x01A80020 #define EMIFB_CE1SECCTL 0x01A80044 #define EMIFB_CE0SECCTL 0x01A80048 #define EMIFB_CE2SECCTL 0x01A80050 #define EMIFB_CE3SECCTL 0x01A80054

/* Setup EMIFB Version 2 (120 MHz EMIF) */

*(int*)EMIFB_GCTL = 0x00002060;

*(int*)EMIFB_CE1 = 0xffffff03; // CE1 Flash 8-bit—BOOTLOADER

/* EMIFA Version 2 (120MHz EMIF) */ *(int*)EMIFA_GCTL = 0x00012070; *(int*)EMIFA_CE0 = 0x23228c43; // CE0 SDRAM 1Mx32bitx4bank=16M byte *(int*)EMIFA_CE1 = 0x23228c43; // CE1 8-bit Async *(int*)EMIFA_CE2 = 0x23228c43; // CE2 Daughtercard 32-bit async *(int*)EMIFA_CE3 = 0x23228c43; // CE3 Daughtercard 32-bit async *(int*)EMIFA_SDRAMCTL = 0x56228000; // SDRAM control *(int*)EMIFA_SDRAMTIM = 0x00001E1D; // SDRAM timing refresh *(int*)EMIFA_CE2SECCTL = 0x0032; //Read space; *(int*)EMIFA_CE3SECCTL = 0x0030; // Write back Space;

*(int*)EMIFA_SDRAMCTL |= 0x01000000;}

void Chip_Erase(){ //Unlock command *(unsigned char *)(FlashBaseAddr + 0xAAA) = 0xAA; *(unsigned char *)(FlashBaseAddr + 0x555) = 0x55; *(unsigned char *)(FlashBaseAddr + 0xAAA) = 0x80;

*(unsigned char *)(FlashBaseAddr + 0xAAA) = 0xAA; *(unsigned char *)(FlashBaseAddr + 0x555) = 0x55; *(unsigned char *)(FlashBaseAddr + 0xAAA) = 0x10;

// Polling D2, D6, D7 to determine when completed. // Polling D7 change to "0" after erase complete. while ((*(unsigned char *)FlashBaseAddr) != 0xff);}

int Write_Byte(unsigned int Address, unsigned char data){ unsigned int timeout = 0;

//Unlock command *(unsigned char *)(FlashBaseAddr+0xAAA) = 0xAA; *(unsigned char *)(FlashBaseAddr+0x555) = 0x55; //Setup command *(unsigned char *)(FlashBaseAddr+0xAAA) = 0xA0;

//Write data to destination *(unsigned char *)Address = data; do timeout += 1; while((*(unsigned char *)Address) != data && timeout < 0xffff); if(timeout ==0xffff) return -1; else return 0; // flashnext++;

}

main(){ unsigned int i, Address;

Address = FlashBaseAddr; Init_Emif(); printf("C64x Flash Burn, 8-bit Flash Boot Mode, Write by CHAO\n"); printf("Erasing Flash, Please Waiting……\n"); Chip_Erase(); printf("Reset Flash to Normal Mode\n"); *(unsigned char *)FlashBaseAddr = 0xF0; // Reset Flash to Normal Mode;

printf("Programming Begin Start From 0x64000000, Length = 0x%x; Please Wait Again……\n", hex_CNT ); for(i=0; i<hex_CNT; i++) { if(Write_Byte(Address++, hex[i]) == -1) { printf("Write error at Address: 0x%x\n", Address-1); return; } }

printf("Write Complete Flag\n"); for (i= 0; i<4; i++) Write_Byte(Address++, 0); // Write complete flag;

printf("Flash Burn End, Reset Flash to Normal Mode.\n"); *(unsigned char *)FlashBaseAddr = 0xF0; // Reset Flash to Normal Mode;

printf("Re-Power On the Board.\n"); while(1);}

Tony Tang：

回复 qinbiao yang:

qinbiao yang还有就是感觉芯片的那个Byte引脚，控制8bit，16bit方式的引脚下拉的时候必须是直接接地或者0欧电阻接地啊，不能以太大电阻下拉到地啊！

对于这种情况，你可以量一下电阻上面那端（接地的另一端）的电平到底是多少，是不是没有低于VIL.

qinbiao yang：

回复 Tony Tang:

谢谢回复！我用示波器和万用表多次测量过，测出的电压都是低于VIL的哦！之前也没注意过这种直接接地和电阻下拉到地的区别，或许也不是这个原因导致的工作不正常吧！