?? sst39vf400a.c
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/*************************************************************************************************\
The C code in the document contain the following routines,
in this order:
Name Function
------------------------------------------------------------------
Check_SST_39VF400A Check manufacturer and device ID
CFI_Query CFI Query Entry/Exit command sequence
Erase_One_Sector Erase a sector of 2048 words
Erase_One_Block Erase a block of 32K words
Erase_Entire_Chip Erase the contents of the entire chip
Program_One_Word Alter data in one word
Program_One_Sector Alter data in 2048 word sector
Program_One_Block Alter data in 32K word block
Check_Toggle_Ready End of internal program or erase detection using
Toggle bit
Check_Data_Polling End of internal program or erase detection using
Data# polling
Flash_Reads Read a data from flash memory
"C" LANGUAGE DRIVERS
*****************************************************************************************************/
/***********************************************************************/
/* Copyright Silicon Storage Technology, Inc. (SST), 1994-2001 */
/* Example "C" language Driver of 39VF400A 4 Mbit Multi-Purpose Flash */
/* Nelson Wang, Silicon Storage Technology, Inc. */
/* */
/* Revision 1.0, Sept. 12, 2001 */
/* */
/* This file requires these external "timing" routines: */
/* */
/* 1.) Delay_150_Nano_Seconds */
/* 2.) Delay_25_Milli_Seconds */
/* 3.) Delay_100_Milli_Seconds */
/***********************************************************************/
#define FALSE 0
#define TRUE 1
#define SECTOR_SIZE 2048 /* Must be 2048 words for 39VF400A */
#define BLOCK_SIZE 32768 /* Must be 32K words for 39VF400A */
#define SST_ID 0x00BF /* SST Manufacturer's ID code */
#define SST_39VF400A 0x2780 /* SST39VF400A device code */
/* same device code as SST39VF400 */
/*Regard to data space, take word address */
#define Addr5555 (WORD *)0x205555
#define Addr2AAA (WORD *)0x202AAA
#define Addr0000 (WORD *)0x200000
#define Addr0001 (WORD *)0x200001
/*
#define Addr5555 (WORD *)0x40AAAA
#define Addr2AAA (WORD *)0x405554
#define Addr0000 (WORD *)0x400000
#define Addr0001 (WORD *)0x400002
*/
/*
#define Addr5555 (WORD *)0x405555
#define Addr2AAA (WORD *)0x402AAA
#define Addr0000 (WORD *)0x400000
#define Addr0001 (WORD *)0x400001
*/
typedef unsigned char BYTE;
typedef unsigned int WORD;
/* -------------------------------------------------------------------- */
/* EXTERNAL ROUTINES */
/* -------------------------------------------------------------------- */
void Delay_150_Nano_Seconds();
void Delay_25_Milli_Seconds();
void Delay_100_Milli_Seconds();
void Check_Toggle_Ready();
void Check_Data_Polling();
/************************************************************************/
/* PROCEDURE: Check_SST_39VF400A */
/* */
/* This procedure decides whether a physical hardware device has a */
/* SST39VF400A 4 Mbit Multi-Purpose Flash installed or not. */
/* */
/* Input: */
/* None */
/* */
/* Output: */
/* return TRUE: indicates a SST39VF400A */
/* return FALSE: indicates not a SST39VF400A */
/************************************************************************/
extern int Check_SST_39VF400A(void) /* same device code as SST39VF400 */
{
WORD * Temp;
WORD SST_id1;
WORD * Temp1;
WORD SST_id2;
int ReturnStatus;
/* Issue the Software Product ID code to 39VF400A */
Temp1 = Addr5555; /* set up address to be C000:5555h */
*Temp1= 0xAAAA; /* write data 0xAAAA to the address */
Temp1 = Addr2AAA; /* set up address to be C000:2AAAh */
*Temp1= 0x5555; /* write data 0x5555 to the address */
Temp1 = Addr5555; /* set up address to be C000:5555h */
*Temp1= 0x9090; /* write data 0x9090 to the address */
Delay_150_Nano_Seconds(); /* insert delay time = Tida */
/* Read the product ID from 39VF400A */
Temp = Addr0000; /* set up address to be C000:0000h */
SST_id1 = *Temp; /* get first ID word */
SST_id1 = SST_id1 & 0xFF; /* mask of higher byte */
Temp1 = Addr0001; /* set up address to be C000:0001h */
SST_id2 = *Temp1; /* get second ID word */
/* Determine whether there is a SST39VF400A installed or not */
if ((SST_id1 == SST_ID) && (SST_id2 ==SST_39VF400A))
ReturnStatus = TRUE;
else
ReturnStatus = FALSE;
/* Issue the Soffware Product ID Exit code thus returning the 39VF400A*/
/* to the read operating mode */
Temp1 = Addr5555; /* set up address to be C000:5555h */
*Temp1 = 0xAAAA; /* write data 0xAAAA to the address */
Temp1 = Addr2AAA; /* set up address to be C000:2AAAh */
*Temp1 = 0x5555; /* write data 0x5555 to the address */
Temp1 = Addr5555; /* set up address to be C000:5555h */
*Temp1 = 0xF0F0; /* write data 0xF0F0 to the address */
Delay_150_Nano_Seconds(); /* insert delay time = Tida */
return(ReturnStatus);
}
/************************************************************************/
/* PROCEDURE: CFI_Query */
/* */
/* This procedure should be used to query for CFI information */
/* */
/* Input: */
/* None */
/* */
/* Output: */
/* None */
/************************************************************************/
extern void CFI_Query(void)
{
WORD * Temp1;
/* Issue the Software Product ID code to 39VF400A */
Temp1 = Addr5555; /* set up address to be C000:5555h */
*Temp1= 0xAAAA; /* write data 0xAAAA to the address */
Temp1 = Addr2AAA; /* set up address to be C000:2AAAh */
*Temp1= 0x5555; /* write data 0x5555 to the address */
Temp1 = Addr5555; /* set up address to be C000:5555h */
*Temp1= 0x9898; /* write data 0x9898 to the address */
Delay_150_Nano_Seconds(); /* insert delay time = Tida */
/* --------------------------------- */
/* Perform all CFI operations here */
/* NOTE: no sample code provided */
/* --------------------------------- */
/* Issue the CFI Exit code thus returning the 39VF400A */
/* to the read operating mode */
Temp1 = Addr5555; /* set up address to be C000:5555h */
*Temp1 = 0xAAAA; /* write data 0xAAAA to the address */
Temp1 = Addr2AAA; /* set up address to be C000:2AAAh */
*Temp1 = 0x5555; /* write data 0x5555 to the address */
Temp1 = Addr5555; /* set up address to be C000:5555h */
*Temp1 = 0xF0F0; /* write data 0xF0F0 to the address */
Delay_150_Nano_Seconds(); /* insert delay time = Tida */
}
/************************************************************************/
/* PROCEDURE: Erase_One_Sector */
/* */
/* This procedure can be used to erase a total of 2048 words. */
/* */
/* Input: */
/* Dst DESTINATION address where the erase operation starts */
/* */
/* Output: */
/* NONE */
/************************************************************************/
extern void Erase_One_Sector (WORD * Dst) //SAX for Sector-Erase; uses AMS-A11 address lines
{
WORD * Temp;
/* Issue the Sector Erase command to 39VF400A */
Temp = Addr5555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = Addr2AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = Addr5555; /* set up address to be C000:5555h */
*Temp = 0x8080; /* write data 0x8080 to the address */
Temp = Addr5555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = Addr2AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = Dst; /* set up starting address to be erased */
*Temp = 0x3030; /* write data 0x3030 to the address */
Delay_25_Milli_Seconds(); /* Delay time = Tse */
}
/************************************************************************/
/* PROCEDURE: Erase_One_Block */
/* */
/* This procedure can be used to erase a total of 32K words. */
/* */
/* Input: */
/* Dst DESTINATION address where the erase operation starts */
/* */
/* Output: */
/* NONE */
/************************************************************************/
extern void Erase_One_Block (WORD * Dst) //BAX for Block-Erase; uses AMS-A15 address lines
{
WORD * Temp;
/* Issue the Sector Erase command to 39VF400A */
Temp = Addr5555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = Addr2AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = Addr5555; /* set up address to be C000:5555h */
*Temp = 0x8080; /* write data 0x8080 to the address */
Temp = Addr5555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = Addr2AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = Dst; /* set up starting address to be erased */
*Temp = 0x5050; /* write data 0x5050 to the address */
Delay_25_Milli_Seconds(); /* Delay time = Tbe */
}
/************************************************************************/
/* PROCEDURE: Erase_Entire_Chip */
/* */
/* This procedure can be used to erase the entire chip. */
/* */
/* Input: */
/* NONE */
/* */
/* Output: */
/* NONE */
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