📄 sst39vf080.txt
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Temp = (BYTE far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAA; /* write data 0xAA to the address */
Temp = (BYTE far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
Temp = (BYTE far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0x80; /* write data 0x80 to the address */
Temp = (BYTE far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAA; /* write data 0xAA to the address */
Temp = (BYTE far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
Temp = Dst; /* set up starting address to be erased */
*Temp = 0x50; /* write data 0x50 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 */
/************************************************************************/
void Erase_Entire_Chip()
{
BYTE far *Temp;
/* Issue the Chip Erase command to 39VF080 */
Temp = (BYTE far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAA; /* write data 0xAA to the address */
Temp = (BYTE far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
Temp = (BYTE far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0x80; /* write data 0x80 to the address */
Temp = (BYTE far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xAA; /* write data 0xAA to the address */
Temp = (BYTE far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
Temp = (BYTE far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0x10; /* write data 0x10 to the address */
Delay_100_Milli_Seconds(); /* Delay Tsce time */
}
/************************************************************************/
/* PROCEDURE: Program_One_Byte */
/* */
/* This procedure can be used to program ONE byte of data to the */
/* 39VF080. */
/* */
/* NOTE: It is necessary to first erase the sector containing the */
/* byte to be programmed. */
/* */
/* Input: */
/* Src The BYTE which will be written to the 39VF080 */
/* Dst DESTINATION address which will be written with the */
/* data passed in from Src */
/* */
/* Output: */
/* None */
/************************************************************************/
void Program_One_Byte (BYTE Src, BYTE far *Dst)
{
BYTE far *Temp;
BYTE far *DestBuf;
DestBuf = Dst;
Temp = (BYTE far *)0xC0005555; /* set up address to be C000:555h */
*Temp = 0xAA; /* write data 0xAA to the address */
Temp = (BYTE far *)0xC0002AAA; /* set up address to be C000:2AAAh */
*Temp = 0x55; /* write data 0x55 to the address */
Temp = (BYTE far *)0xC0005555; /* set up address to be C000:5555h */
*Temp = 0xA0; /* write data 0xA0 to the address */
*DestBuf = Src; /* 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 4096 bytes of data */
/* to the SST39VF080. */
/* */
/* NOTES: 1. It is necessary to first erase the sector before the */
/* programming. */
/* 2. This sample code assumes the destination address passed */
/* from the calling function is the starting address of the */
/* sector. */
/* */
/* Input: */
/* Src SOURCE address containing the data which will be */
/* written to the 39VF080 */
/* Dst DESTINATION address which will be written with the */
/* data passed in from Src */
/* */
/* Output: */
/* None */
/************************************************************************/
void Program_One_Sector (BYTE far *Src, BYTE far *Dst)
{
BYTE far *SourceBuf;
BYTE far *DestBuf;
int Index;
SourceBuf = Src;
DestBuf = Dst;
Erase_One_Sector(Dst); /* erase the sector first */
for (Index = 0; Index < SECTOR_SIZE; Index++)
{
/* transfer data from source to destination */
Program_One_Byte( *SourceBuf, DestBuf);
++DestBuf;
++SourceBuf;
}
}
/************************************************************************/
/* PROCEDURE: Program_One_Block */
/* */
/* This procedure can be used to program a total of 64k bytes of data */
/* to the SST39VF080. */
/* */
/* NOTES: 1. It is necessary to first erase the block before the */
/* programming. */
/* 2. This sample code assumes the destination address passed */
/* from the calling function is the starting address of the */
/* block. */
/* */
/* Input: */
/* Src SOURCE address containing the data which will be */
/* written to the 39VF080 */
/* Dst DESTINATION address which will be written with the */
/* data passed in from Src */
/* */
/* Output: */
/* None */
/************************************************************************/
void Program_One_Block (BYTE far *Src, BYTE far *Dst)
{
BYTE far *SourceBuf;
BYTE far *DestBuf;
int Index;
SourceBuf = Src;
DestBuf = Dst;
Erase_One_Block(Dst); /* erase the sector first */
for (Index = 0; Index < BLOCK_SIZE; Index++)
{
/* transfer data from source to destination */
Program_One_Byte( *SourceBuf, DestBuf);
++DestBuf;
++SourceBuf;
}
}
/************************************************************************/
/* 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 be set-up by the caller */
/* */
/* Output: */
/* None */
/************************************************************************/
void Check_Toggle_Ready (BYTE far *Dst)
{
BYTE Loop = TRUE;
BYTE PreData;
BYTE CurrData;
unsigned long TimeOut = 0;
PreData = *Dst;
PreData = PreData & 0x40;
while ((TimeOut< 0x07FFFFFF) && (Loop))
{
CurrData = *Dst;
CurrData = CurrData & 0x40;
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 be set-up by the caller */
/* True Data is the original (true) data */
/* */
/* Output: */
/* None */
/************************************************************************/
void Check_Data_Polling (BYTE far *Dst, BYTE TrueData)
{
BYTE Loop = TRUE;
BYTE CurrData;
unsigned long TimeOut = 0;
TrueData = TrueData & 0x80;
while ((TimeOut< 0x07FFFFFF) && (Loop))
{
CurrData = *Dst;
CurrData = CurrData & 0x80;
if (TrueData == CurrData)
Loop = FALSE; /* ready to exit the while loop */
TimeOut++;
}
}
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