使用的NandFlash为三星的K9F2G08U0M

1、使用的Nand Flash为三星的K9F2G08U0M，存储为256M，数据宽度为8bit.具体的资料可以参考datasheet.由于S3C2440里面包括了Nand FLash 控制器，所以，我们的工作就是根据芯片手册配置一下寄存器。包括的寄存器如下： NFCONF;NFCONT;NFCMD;NFADDR;NFDATA;NFMECCD0;NFMECCD1;NFSECCD;NFSTAT;NFESTAT0;NFESTAT1;NFMECC0；NFMECC1;NFSECC;NFSBLK;NFEBLK;(1) 对于每个寄存器的地址，每一位的功能可以参考S3C2440芯片手册！对于目前的编程主要涉及到如

2、下五个寄存器：NFCONT;NFCMD;NFADDR;NFDATA；NFSTAT；使用宏定义：#define rNFCONF (*(volatile unsigned *)0x4E000000) #define rNFCONT (*(volatile unsigned *)0x4E000004) #define rNFCMD (*(volatile unsigned *)0x4E000008) #define rNFADDR (*(volatile unsigned char *)0x4E00000C)#define rNFDATA8 (*(volatile unsigned char *)0

3、x4E000010) #define rNFSTAT (*(volatile unsigned *)0x4E000020)特别注明：对于NFCONF寄存器，特别要说明的是TACLS，TWRPH0，TWRPH1，这三个参数。如何设置这三个参数，主要得看K9F2G08U0M 手册上的时序表，参数表，上面已经写好了CLE ，setup时间，WE_N的Pulse WiDth,WE_N HIGH HOLD TIME .根据这些参数，设置个合适的TACLS，TWRPH0，TWRPH1值！(2) 命令！ Nand Flash编程时涉及到很多命令，其实这些命令帮助我们完成了很多的工作，我们现在只需做发送命令的

4、工作。#define Read_Cmd00#define Read_Cmd10x30#define Read_ID_Cmd0x90#define Reset_Cmd0xFF#define PageProgram_Cmd00x80#define PageProgram_Cmd10x10#define Cache_Program_Cmd00x80#define Cache_Program_Cmd10x15#define Copy_Back_Program_Cmd00x85#define Copy_Back_Program_Cmd1 0x10#define Block_Erase_Cmd00x60#

5、define Block_Erase_Cmd10xD0#define Read_Status_Cmd0x70当我们编写擦出，读，编程Nand Flash的函数时，就会涉及到以上各个命令。对于如何使用以上命令，在什么周期用，时序条件如何，完全可以参考K9F2G08U0M手册，上面很详细。写函数时，可以根据流程图，时序图，文字，一步步来，基本上不会有太大的问题。关于Erase operation根据上图，相信编写擦除函数，应该问题不大啊！（3） 本次实验主要完成以下函数的设计void S3C2440_Nand_Reset(void);unsigned S3C2440_Nand_Wait_Idle(

6、void);void S3C2440_Nand_Init(void);unsigned short S3C2440_Nand_Read_ID(void); /获取Nand Flash 设备类型号的void S3C2440_Nand_WR_Addr(unsigned int addr);unsigned S3C2440_Nand_Block_Erase(unsigned block_addr);void S3C2440_Nand_Read(unsigned char * des_addr,unsigned int src_addr,int size);unsigned S3C2440_Nand_

7、Program(unsigned char * buf,unsigned int addr);分享以下设计代码：/ 0:pass;1:failunsigned S3C2440_Nand_Wait_Idle(void) unsigned char stat;S3C2440_Nand_WRCmd(Read_Status_Cmd);dostat=S3C2440_Nand_RD_Data8();while(!(stat&0x40);return stat&0x1;void S3C2440_Nand_Init(void)S3C2440_Nand_CONF()=(TACLS12) | (TWRPH08)

8、| (TWRPH14) |(0NFCONT = (013)|(012)|(010)|(09)|(08)|(16)|(15)|(14)|(11)|(10);unsigned short S3C2440_Nand_Read_ID(void)unsigned short ID;S3C2440_Nand_Chip_En();S3C2440_Nand_WRCmd(Read_ID_Cmd);S3C2440_NandWR_Addr_Single(0);while(S3C2440_Nand_ISBUSY();ID=S3C2440_Nand_RD_Data8()NAND_SECTOR_BIT_WID+1;S3C

9、2440_NandWR_Addr_Single(column_addr&0xff);S3C2440_NandWR_Addr_Single(column_addr8)&0x0f);S3C2440_NandWR_Addr_Single(page_addr&0xff);S3C2440_NandWR_Addr_Single(page_addr8)&0xff);S3C2440_NandWR_Addr_Single(page_addr16)&0x1);unsigned S3C2440_Nand_Block_Erase(unsigned block_addr)int i,status;block_addr

10、&=0x3f; /ingore the low 6 bits;S3C2440_Nand_Chip_En();S3C2440_Nand_WRCmd(Block_Erase_Cmd0);S3C2440_NandWR_Addr_Single(block_addr&0xff);S3C2440_NandWR_Addr_Single(block_addr8)&0xff);S3C2440_NandWR_Addr_Single(block_addr16)&0x1);S3C2440_Nand_WRCmd(Block_Erase_Cmd1);for(i=0;iNAND_SECTOR_BIT_WID;S3C2440

11、_Nand_Chip_En();while (page_num)S3C2440_Nand_InitEcc();S3C2440_Nand_WRCmd(Read_Cmd0);S3C2440_Nand_WR_Addr(src_addr+(j(NAND_SECTOR_BIT_WID+1);S3C2440_Nand_WRCmd(Read_Cmd1);for(i=0;i100;i+);while(S3C2440_Nand_ISBUSY();for(i=0;iNAND_SECTOR_SIZE;i+)*des_addr+=S3C2440_Nand_RD_Data8();page_num-;j+;S3C2440

12、_Nand_Chip_Disable();unsigned S3C2440_Nand_Program(unsigned char * buf,unsigned int addr)int i,status;if(addr & NAND_BLOCK_MASK)return Addr_NOT_Align; /address or size is not align;S3C2440_Nand_Chip_En();S3C2440_Nand_InitEcc(); S3C2440_Nand_WRCmd(PageProgram_Cmd0);S3C2440_Nand_WR_Addr(addr);for(i=0;

13、iNAND_SECTOR_SIZE;i+)S3C2440_Nand_WR_Data8(*buf+);S3C2440_Nand_WRCmd(PageProgram_Cmd1);if(S3C2440_Nand_Wait_Idle() status=ERROR; else status=TRUE;S3C2440_Nand_Chip_Disable();return status;对于上面函数里面涉及的一下小函数，宏定义，设计起来很简单，在此就不累述了，看看芯片资料就可以了！对于K9F2G08U0M使用的地址共29位，A0A28,分5个周期完成发送工作！对于S3C2440_Nand_Block_Erase（）函数涉及的只是A12A28，row address，当然其中A12A17会被忽略，编程时应该考虑到！对于S3C2440_Nand_Read(unsigned char * des_addr,unsigned int src_addr,int size) 函数里面的参数src_a