39VF160
16 Mbit Multi-Purpose Flash
September 2001
ABOUT THE SOFTWARE
This application note provides software driver examples for 39VF160,16 Mbit Multi-Purpose Flash, that can be used in any microprocessor based system. Software driver examples used in this document．nbsputilize two programming languages: (a) high -level "C" for broad platform support and (b) optimized x86 assembly language. In many cases, software driver routines can be inserted "as is" into the main body of code being developed by the system software developers. Extensive comments are included in each routine to describe the function of each routine. The driver in "C" language can be used with many microprocessors and microcontrollers, while the x86 assembly language provides an optimized solution for x86 microprocessors.
ABOUT THE 39VF160
Companion product datasheets for the 39VF160 should be reviewed in conjunction with this application note for a complete understanding of the device.
Both the C and x86 assembly code in the document．nbspcontain the following routines, in this order:
Name Function
------------------------------------------------------------------
Check_SST_39VF160 Check manufacturer and device ID
CFI_Query CFI Query Entry/Exit command sequence
Erase_Entire_Chip Erase the contents of the entire chip
Erase_One_Sector Erase a sector of 2048 word
Erase_One_Block Erase a block of 32K word
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
"C" LANGUAGE DRIVERS
/***********************************************************************/
/* Copyright Silicon Storage Technology, Inc. (SST), 1994-2001 */
/* Example "C" language Driver of 39VF160 16 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 39VF160 */
#define BLOCK_SIZE 32768 /* Must be 32K words for 39VF160 */
#define SST_ID 0xBF /* SST Manufacturer's ID code */
#define SST_39VF160 0x2782 /* SST 39VF160 device code */
typedef unsigned char BYTE;
typedef unsigned int WORD;
/* -------------------------------------------------------------------- */
/* EXTERNAL ROUTINES */
/* -------------------------------------------------------------------- */
extern void Delay_150_Nano_Seconds();
extern void Delay_25_Milli_Seconds();
extern void Delay_100_Milli_Seconds();
*************************************************************************/
/* PROCEDURE: Check_SST_39VF160 */
/* */
/* This procedure decides whether a physical hardware device has a */
/* SST39VF160 16 Mbit Multi-Purpose Flash installed or not. */
/* */
/* Input: */
/* None */
/* */
/* Output: */
/* return TRUE: indicates a SST39VF160 */
/* return FALSE: indicates not a SST39VF160 */
/************************************************************************/
int Check_SST_39VF160()
{
WORD far *Temp;
WORD SST_id1;
WORD far *Temp1;
WORD SST_id2;
int ReturnStatus;
/* Issue the Software Product ID code to 39VF160 */
Temp1 = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp1= 0xAAAA; /* write data 0xAAAA to the address */
Temp1 = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp1= 0x5555; /* write data 0x5555 to the address */
Temp1 = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp1= 0x9090; /* write data 0x9090 to the address */
Delay_150_Nano_Seconds();
/* Read the product ID from 39VF160 */
Temp = (WORD far *)0xC0000000; /* set up address to be C000:0000h */
SST_id1 = *Temp; /* get first ID word */
SST_id1 = SST_id1 & 0xFF /* mask of higher byte */
Temp1 = (WORD far *)0xC0000001;/* set up address to be C000:0001h */
SST_id2 = *Temp1; /* get second ID word */
/* Determine whether there is a SST39VF160 installed or not */
if ((SST_id1 == SST_ID) && (SST_id2 ==SST_39VF160))
ReturnStatus = TRUE;
else
ReturnStatus = FALSE;
/* Issue the Soffware Product ID Exit code thus returning the 39VF160 */
/* to the read operating mode */
Temp1 = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp1 = 0xAAAA; /* write data 0xAAAA to the address */
Temp1 = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp1 = 0x5555; /* write data 0x5555 to the address */
Temp1 = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp1 = 0xF0F0; /* write data 0xF0F0 to the address */
Delay_150_Nano_Seconds();
return(ReturnStatus);
}
*************************************************************************/
/* PROCEDURE: CFI_Query */
/* */
/* This procedure should be used to query for CFI information */
/* */
/* Input: */
/* None */
/* */
/* Output: */
/* None */
/************************************************************************/
int CFI_Query()
{
WORD far *Temp1;
/* Issue the Software Product ID code to 39VF160 */
Temp1 = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp1= 0xAAAA; /* write data 0xAAAA to the address */
Temp1 = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp1= 0x5555; /* write data 0x5555 to the address */
Temp1 = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp1= 0x9898; /* write data 0x9898 to the address */
Delay_150_Nano_Seconds();
/* --------------------------------- */
/* Perform all CFI operations here */
/* NOTE: no sample code provided */
/* --------------------------------- */
/* Issue the CFI Exit code thus returning the 39VF160 */
/* to the read operating mode */
Temp1 = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp1 = 0xAAAA; /* write data 0xAAAA to the address */
Temp1 = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp1 = 0x5555; /* write data 0x5555 to the address */
Temp1 = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp1 = 0xF0F0; /* write data 0xF0F0 to the address */
Delay_150_Nano_Seconds();
}
*************************************************************************/
/* PROCEDURE: Erase_Entire_Chip */
/* */
/* This procedure can be used to erase the entire chip. */
/* */
/* Input: */
/* NONE */
/* */
/* Output: */
/* NONE */
/************************************************************************/
int Erase_Entire_Chip
{
WORD far *Temp;
/* Issue the Chip Erase command to 39VF160 */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0x8080; /* write data 0x8080 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0x1010; /* write data 0x1010 to the address */
Delay_100_Milli_Seconds(); /* Delay Tsce time */
}
*************************************************************************/
/* PROCEDURE: Erase_One_Sector */
/* */
/* This procedure can be used to erase a total of 2048 words. */
/* */
/* Input: */
/* Dst DESTINATION address which the erase operation starts */
/* */
/* Output: */
/* NONE */
/************************************************************************/
int Erase_One_Sector (WORD far *Dst)
{
WORD far *Temp;
/* Issue the Sector Erase command to 39VF160 */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0x8080; /* write data 0x8080 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* 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 which the erase operation starts */
/* */
/* Output: */
/* NONE */
/************************************************************************/
int Erase_One_Block (WORD far *Dst)
{
WORD far *Temp;
/* Issue the Sector Erase command to 39VF160 */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0x8080; /* write data 0x8080 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* 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: Program_One_Word */
/* */
/* This procedure can be used to program ONE word of date to the */
/* 39VF160. */
/* */
/* NOTE: It is VERY important the sector containing the word to be */
/* programmed was ERASED first. */
/* */
/* Input: */
/* Src The WORD which will be written to the 39VF160 */
/* Dst DESTINATION address which will be written with the */
/* data passed in from Src */
/* */
/* Output: */
/* None */
/************************************************************************/
void Program_One_Word (WORD SrcWord, WORD far *Dst)
{
WORD far *SourceBuf;
WORD far *DestBuf;
int Index;
DestBuf = Dst;
Temp = (WORD far *)0xC0005555; /* set up address to be C000:555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xA0A0; /* write data 0xA0A0 to the address */
*DestBuf = SrcWord; /* transfer the byte to destination */
Check_Toggle_Ready(DestBuf); /* wait for TOGGLE bit to get ready */
}
/************************************************************************/
/* PROCEDURE: Program_One_Sector */
/* */
/* This procedure can be used to program a total of 2048 words of data */
/* to the SST39VF160. */
/* */
/* Input: */
/* Src SOURCE address containing the data which will be */
/* written to the 39VF160 */
/* Dst DESTINATION address which will be written with the */
/* data passed in from Src */
/* */
/* Output: */
/* None */
/************************************************************************/
void Program_One_Sector (WORD far *Src, WORD far *Dst)
{
WORD far *Temp;
WORD far *SourceBuf;
WORD far *DestBuf;
int Index;
SourceBuf = Src;
DestBuf = Dst;
Erase_One_Sector(Dst); /* erase the sector first */
for (Index = 0; Index < SECTOR_SIZE; Index++)
{
Temp = (WORD far *)0xC0005555; /* set up address to be C000:555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xA0A0; /* write data 0xA0A0 to the address */
Temp = DestBuf; /* save the original Destination address */
*DestBuf++ = *SourceBuf++; /* transfer data from source to destination */
Check_Toggle_Ready(Temp); /* wait for TOGGLE bit to get ready */
}
}
/************************************************************************/
/* PROCEDURE: Program_One_Block */
/* */
/* This procedure can be used to program a total of 32k words of data */
/* to the SST39VF160. */
/* */
/* Input: */
/* Src SOURCE address containing the data which will be */
/* written to the 39VF160 */
/* Dst DESTINATION address which will be written with the */
/* data passed in from Src */
/* */
/* Output: */
/* None */
/************************************************************************/
void Program_One_Block (WORD far *Src, WORD far *Dst)
{
WORD far *Temp;
WORD far *SourceBuf;
WORD far *DestBuf;
int Index;
SourceBuf = Src;
DestBuf = Dst;
Erase_One_Block(Dst); /* erase the sector first */
for (Index = 0; Index < BLOCK_SIZE; Index++)
{
Temp = (WORD far *)0xC0005555; /* set up address to be C000:555h */
*Temp = 0xAAAA; /* write data 0xAAAA to the address */
Temp = (WORD far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x5555; /* write data 0x5555 to the address */
Temp = (WORD far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xA0A0; /* write data 0xA0A0 to the address */
Temp = DestBuf; /* save the original Destination address */
*DestBuf++ = *SourceBuf++; /* transfer data from source to destination */
Check_Toggle_Ready(Temp); /* wait for TOGGLE bit to get ready */
}
}
/************************************************************************/
/* PROCEDURE: Check_Toggle_Ready */
/* */
/* During the internal program cycle, any consecutive read operation */
/* on DQ6 will produce alternating 0's and 1's (i.e. toggling between */
/* 0 and 1). When the program cycle is completed, DQ6 of the data will */
/* stop toggling. After the DQ6 data bit stops toggling, the device is */
/* ready for next operation. */
/* */
/* Input: */
/* Dst must already set-up by the caller */
/* */
/* Output: */
/* None */
/************************************************************************/
void Check_Toggle_Ready (WORD far *Dst)
{
BYTE Loop = TRUE;
WORD PreData;
WORD CurrData;
unsigned long TimeOut = 0;
PreData = *Dst;
PreData = PreData & 0x4040;
while ((TimeOut< 0x07FFFFFF) && (Loop))
{
CurrData = *Dst;
CurrData = CurrData & 0x4040;
if (PreData == CurrData)
Loop = FALSE; /* ready to exit the while loop */
PreData = CurrData;
TimeOut++;
}
}
/************************************************************************/
/* PROCEDURE: Check_Data_Polling */
/* */
/* During the internal program cycle, any attempt to read DQ7 of the */
/* last byte loaded during the page/byte-load cycle will receive the */
/* complement of the true data. Once the program cycle is completed, */
/* DQ7 will show true data. */
/* */
/* Input: */
/* Dst must already set-up by the caller */
/* True Data is the original (true) data */
/* */
/* Output: */
/* None */
/************************************************************************/
void Check_Data_Polling (WORD far *Dst, WORD TrueData)
{
BYTE Loop = TRUE;
WORD CurrData;
unsigned long TimeOut = 0;
TrueData = TrueData & 0x8080;
while ((TimeOut< 0x07FFFFFF) && (Loop))
{
CurrData = *Dst;
CurrData = CurrData & 0x8080;
if (TrueData == CurrData)
Loop = FALSE; /* ready to exit the while loop */
TimeOut++;
}
}
8086 ASSEMBLY LANGUAGE DRIVERS
; ======================================================================
; Copyright Silicon Storage Technology, Inc. (SST), 1994-2001
; EXAMPLE 8086 assembly Drivers for SST39VF160 16 Mbit MultiPurpose Flash
; Frank Cirimele, 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
; ======================================================================
SECTOR_SIZE EQU 2048 Must be 4096 bytes for SST39VF160
BLOCK_SIZE EQU 32768
SST_ID EQU 0BFh SST Manufacturer's ID code
SST_SST39VF160 EQU 02782h SST SST39VF160 internal code
ABS_SEGMENT EQU 0C000h
extrn Delay_150_Nano_Seconds:near
extrn Delay_25_Milli_Seconds:near
extrn Delay_100_Milli_Seconds:near
;=======================================================================
; PROCEDURE: Check_SST_SST39VF160
;
; This procedure decides whether a physical hardware device has a
; SST39VF160 16 Mbit Multi-Purpose Flash installed or not.
;
; Input:
; None
;
; Output:
; carry bit: 0 = SST39VF160 installed
; carry bit: 1 = SST39VF160 NOT installed
;
;=======================================================================
Check_SST_SST39VF160 proc near
push ax preserve register values
push ds
pushf save interrupt state
; It is mandatory to maintain the pushf instruction as the last push
; instruction.
cli disable interrupts
mov ax, ABS_SEGMENT
mov ds, ax
mov ds:word ptr [5555h], 0AAAAh issue the 3-byte product ID
mov ds:word ptr [2AAAh], 05555h command to the SST39VF160
mov ds:word ptr [5555h], 09090h
call Delay_150_Nano_Seconds
mov ax, ds:[0]
cmp al, SST_ID is this a SST part?
jne CSC5 NO, then return Carry set
mov ax, ds:[1]
cmp ax, SST_SST39VF160 is it a SST39VF160?
jne CSC5 NO, then Non-SST part
CSC4:
pop ax get flags from stack
and ax, 0FFFEh and clear carry flag
jmp short CSC6
CSC5:
pop ax get flags from stack
or ax, 0001h and set carry flag
CSC6:
push ax return flags to stack
;
; Issue the Software Product ID Exit code thus returning the SST39VF160
; to the read operation mode.
;
mov ds:word ptr [5555h], 0AAAAh issue the 3-byte product ID
mov ds:word ptr [2AAAh], 05555h exit command to the SST39VF160
mov ds:word ptr [5555h], 0F0F0h
call Delay_150_Nano_Seconds insert delay = Tida
popf restore flags
pop ds restore register values
pop ax
ret
Check_SST_SST39VF160 endp
;=======================================================================
; PROCEDURE: CFI_Query
;
; This procedure provides access to the CFI information embedded within
; the SST39VF160 16 Mbit Multi-Purpose Flash device.
;
; Input:
; None
;
; Output:
; None
;
;=======================================================================
CFI_Query proc near
push ax preserve register values
push ds
pushf save interrupt state
cli disable interrupts
mov ax, ABS_SEGMENT
mov ds, ax
mov ds:word ptr [5555h], 0AAAAh issue the 3-byte product ID
mov ds:word ptr [2AAAh], 05555h command to the SST39VF160
mov ds:word ptr [5555h], 09898h
call Delay_150_Nano_Seconds insert delay = Tida
; -----------------------------------
; Perform all CFI operations here
; NOTE: NO sample code provided
; -----------------------------------
mov ds:word ptr [5555h], 0AAAAh issue the 3-byte product ID
mov ds:word ptr [2AAAh], 05555h exit command to the SST39VF160
mov ds:word ptr [5555h], 0F0F0h
call Delay_150_Nano_Seconds insert delay = Tida
popf restore interrupt state
pop ds restore registers
pop ax
ret
CFI_Query endp
; =====================================================================
; PROCEDURE: Erase_Entire_Chip
;
; This procedure can be used to erase the entire contents of
; SST's SST39VF160.
;
; Input:
; none
;
; Output:
; None
; =====================================================================
Erase_Entire_Chip proc near
mov es:word ptr [5555h], 0AAAAh send 6-byte code for
mov es:word ptr [2AAAh], 05555h chip erase
mov es:word ptr [5555h], 08080h
mov es:word ptr [5555h], 0AAAAh
mov es:word ptr [2AAAh], 05555h
mov es:word ptr [5555h], 01010h
call Delay_100_Milli_Seconds insert delay = Tsce
ret
Erase_Entire_Chip endp
; =====================================================================
; PROCEDURE: Erase_One_Sector
;
; This procedure can be used to erase a sector, or total of 2048 bytes,
; in the SST39VF160.
;
; Input:
; es:di points to the beginning address of the "Destination"
; address which will be erased.
; ==> The address MUST be a multiple of 2048
;
; Output:
; None
; =====================================================================
Erase_One_Sector proc near
push ax
mov es:word ptr [5555h], 0AAAAh send 6-byte code for
mov es:word ptr [2AAAh], 05555h sector erase
mov es:word ptr [5555h], 08080h
mov es:word ptr [5555h], 0AAAAh
mov es:word ptr [2AAAh], 05555h
mov ax, 03030h
mov word ptr es:[di], ax
call Delay_25_Milli_Seconds insert delay = Tse
pop ax
ret
Erase_One_Sector endp
; =====================================================================
; PROCEDURE: Erase_One_Block
;
; This procedure can be used to erase a block, or total of 32K words,
; in the SST39VF160.
;
; Input:
; es:di points to the beginning address of the "Destination"
; address which will be erased.
; ==> The address MUST be a multiple of 32K
;
; Output:
; None
; =====================================================================
Erase_One_Block proc near
push ax
mov es:word ptr [5555h], 0AAAAh send 6-byte code for
mov es:word ptr [2AAAh], 05555h block erase
mov es:word ptr [5555h], 08080h
mov es:word ptr [5555h], 0AAAAh
mov es:word ptr [2AAAh], 05555h
mov ax, 05050h
mov word ptr es:[di], ax
call Delay_25_Milli_Seconds insert delay = Tbe
pop ax
ret
Erase_One_Block endp
; =====================================================================
; PROCEDURE: Program_One_Word
;
; This procedure can be used to program ONE word at one program cycle to
; the SST39VF160.
;
; NOTE: It is necessary to first erase the sector containing the byte
; to be programmed.
;
;
; Input:
; ax WORD which will be written into the SST39VF160.
; es:di DESTINATION address which will be written with the
; data input in ax
;
; Output:
; None
; SI, DI: Contains the original values
; =====================================================================
Program_One_Word proc near
;
; Save the registers value on the stack before proceeding
;
push ax
;
; The following will program ONE word to SST39VF160
;
push ds
mov ax, ABS_SEGMENT
mov ds, ax
mov ds:word ptr [5555h], 0AAAAh 3 bytes of "enable protection"
mov ds:word ptr [2AAAh], 05555h sequence to the chip
mov ds:word ptr [5555h], 0A0A0h
pop ds
pop ax restore the word to be programmed from
stack
mov word ptr es:[di], ax program the byte
call check_Toggle_Ready wait for TOGGLE bit to get ready
ret
Program_One_Word endp
; =====================================================================
; PROCEDURE: Program_One_Sector
;
; This procedure can be used to program a memory sector, or total of
; 2048 words, of the SST39VF160.
;
; Input:
; ds:si SOURCE address containing the data which will be
; written into the SST39VF160.
; es:di DESTINATION address which will be written with the
; data passed in for ds:si
;
; Output:
; None
; SI, DI: Contains the original values
; =====================================================================
Program_One_Sector proc near
;
; Save the registers value on the stack before proceeding
;
push ax
push bx
push di
push si
pushf preserve the "Direction" flag in the FLAG
register
cld clear "Direction" flag in the FLAG register
and auto-increment SI and DI
; Erase the sector before programming. Each erase command will erase a total
; of 2048 words for the SST39VF160
;
call Erase_One_Sector
;
; The following loop will program a total of 2048 words to the SST39VF160
;
mov cx, SECTOR_SIZE
POS1:
push ds
mov ax, ABS_SEGMENT
mov ds, ax
mov ds:word ptr [5555h], 0AAAAh 3 word enable command sequence
mov ds:word ptr [2AAAh], 05555h for word program
mov ds:word ptr [5555h], 0A0A0h
pop ds
lodsw get the word to be programmed
mov bx, di preserve DI temporarily
stosw program the word
push di preserve the updated DI temporarily
mov di, bx
call check_Toggle_Ready wait for TOGGLE bit to get ready
pop di retrieve the updated DI
loop POS1 program more words until done
;
; Restore register values from the stack
;
popf
pop si
pop di
pop bx
pop ax
ret
Program_One_Sector endp
; =====================================================================
; PROCEDURE: Program_One_Block
;
; This procedure can be used to program a memory block, or a total of
; 32K words, of the SST39VF160.
;
; Input:
; ds:si SOURCE address containing the data which will be
; written into the SST39VF160.
; es:di DESTINATION address which will be written with the
; data passed in for ds:si
;
; Output:
; None
; SI, DI: Contains the original values
; =====================================================================
Program_One_Block proc near
;
; Save the registers value on the stack before proceeding
;
push ax
push bx
push di
push si
pushf preserve the "Direction" flag in the FLAG
register
cld clear "Direction" flag in the FLAG register
and auto-increment SI and DI
;
; Erase the block before programming. Each erase command will erase a total
; of 32K words of the SST39VF160.
;
call Erase_One_Block
;
; The following loop will program a total of 32K words to SST's SST39VF160
;
mov cx, BLOCK_SIZE
POB1:
push ds
mov ax, ABS_SEGMENT
mov ds, ax
mov ds:word ptr [5555h], 0AAAAh 3 word enable command sequence
mov ds:word ptr [2AAAh], 05555h for word program
mov ds:word ptr [5555h], 0A0A0h
pop ds
lodsw get the word to be programmed
mov bx, di preserve DI temporarily
stosw program the word
push di preserve the updated DI temporarily
mov di, bx
call check_Toggle_Ready wait for TOGGLE bit to get ready
pop di retrieve the updated DI
loop POB1 continue program more words until done
;
; Restore the registers' value from the stack
;
popf
pop si
pop di
pop bx
pop ax
ret
Program_One_Block endp
;======================================================================
; PROCEDURE: Check_Toggle_Ready
;
; During the internal program cycle, any consecutive read operation
; on DQ6 will produce alternating 0?s and 1?s, i.e. toggling between
; 0 and 1. When the program cycle is completed, the DQ6 data will
; stop toggling. After the DQ6 data stops toggling, the device is ready
; for the next operation.
;
; Input:
; es:di must already set-up by the calller
;
; Output:
; None
;======================================================================
Check_Toggle_Ready proc near
push ax save registers
push bx
mov ax, es:[di] read a word form the chip
and ax, 4040h mask out the TOGGLE bit (DQ6)
CTR_Tog2:
mov bx, es:[di] read the same word from the chip again
and bx, 4040h mask out the TOGGLE bit (DQ6)
cmp ax, bx is DQ6 still toggling?
je CTR_Tog3 No, then the write operation is done
xchg ax, bx YES, then continue checking...
jmp short CTR_Tog2
CTR_Tog3:
pop bx restore registers
pop ax
ret
Check_Toggle_Ready endp
;=======================================================================
; PROCEDURE: Check_Data_Polling
;
; During the internal program cycle, any attempt to read DQ7 of the last
; byte loaded during the page/byte-load cycle will receive the complement
; of the true data. Once the program cycle is completed, DQ7 will show
; true data.
;
; Input:
; es:di must already set-up by the caller
; bx contains the original (true) data
;
; Output:
; None
;
;=======================================================================
Check_Data_Polling proc near
push ax
push bx
and bx, 8080h mask out the DQ7 bit
CDP_Tog2:
mov ax, es:[di] read a word from the chip
and ax, 8080h mask out the DQ7 bit
cmp ax, bx is DQ7 still complementing?
jne CDP_Tog2
pop bx
pop ax
ret
Check_Data_Polling endp
[admin via 研發互助社區 ] 39VF160編程已經有3737次圍觀
http://cocdig.com/docs/show-post-42833.html
