Nor Flash Forum Discussions

Hello, I want to use the S29GL512T through SM32F7 and I can't program/erase. In prior’s designs, the board had the memory S29GL128N and now I want to use the new S29GL512T without change the board design.

Thus, the first question is, can I issue the S29GL512T as 128Mbits memory keeping the A23 and A24 pins to no connect? Or is there any other inconvenient?

Then if there is no problem to use S29GL512T, I’ve developing an external loader to program the memory and, as I said, the program/erase doesn't work. I'm not sure what happens, but I suspect the sequence isn't sent successfully because the RD/BY# pin never detects the falling edge. Can you help me and suggest things to check for the program/erase process works?

This is the code for MassErase

int MassErase(void) {
	uint8_t mass_erase = 0;
	unsigned long polling_counter = 0xFFFFFFFF;
	volatile uint16_t status_reg;

	NOR_WRITE(NOR_ADDR_SHIFT(BSP_NOR_BASE_ADDR, NOR_MEMORY_16B, 0x555), 0xAA);
	NOR_WRITE(NOR_ADDR_SHIFT(BSP_NOR_BASE_ADDR, NOR_MEMORY_16B, 0x2AA), 0x55);
	NOR_WRITE(NOR_ADDR_SHIFT(BSP_NOR_BASE_ADDR, NOR_MEMORY_16B, 0x555), 0x80);
	NOR_WRITE(NOR_ADDR_SHIFT(BSP_NOR_BASE_ADDR, NOR_MEMORY_16B, 0x555), 0xAA);
	NOR_WRITE(NOR_ADDR_SHIFT(BSP_NOR_BASE_ADDR, NOR_MEMORY_16B, 0x2AA), 0x55);
	NOR_WRITE(NOR_ADDR_SHIFT(BSP_NOR_BASE_ADDR, NOR_MEMORY_16B, 0x555), 0x10);

	do {
		polling_counter--;
		NOR_WRITE(NOR_ADDR_SHIFT(BSP_NOR_BASE_ADDR, NOR_MEMORY_16B, 0x555), 0x70);
		status_reg = *(__IO uint32_t *)(uint32_t)BSP_NOR_BASE_ADDR;
		if( (status_reg & 0x80) == 0x80  )  /* Are all devices done bit 7 is 1 */
			break;
	}while(polling_counter);

#if DEBUG
	if ((status_reg & 0x20) == 0x20) {
		PRINT_TEXT("Mass erase error");
		mass_erase = 0;
	} else {
		PRINT_TEXT("Mass erase done!");
		mass_erase = 1;
	}
#endif

	return mass_erase;
}

We are planning to use Erase Suspend and Resume operations for S29GL032N NOR Flash in our product.

We want to know how much time Erase Suspend command execution will take (min and max values).

This time is not given in the datasheet.

Regards,

Anil Patil

We are planning to use Erase Suspend and Resume operations during Sector Erase in S29GL032N NOR Flash.
We want to know if there is data available for how much one Erase Suspend and Resume operation will impact on the Sector Erase time (min and max).

Also want to know the device Reliability due to frequent Suspend/Resume operations during Sector Erase.

Regards,

Anil Patil

We are using NOR Flash in our new product. I want to derive Sector Address as required for Protect/Unprotect function. The below shared code uses few macros for deriving the Sector Address. This code did not share the values of the macros used in this function. Can I get the values for macros used in this function?

SHORT_FLASH_SECTOR_ADDRESS, LARGE_SECTOR_SIZE, SMALL_SECTOR_SIZE

void flashProtectAllSectors( void )
{
Uint32 sectorAddress, saIndx;
volatile Uint16 *p; // flash pointer

// Calculate the sector offset address relative to the flash base address.
// See device datasheet Table 3. S29JL032J Sector Addresses - Top Boot Devices
for( saIndx=0; saIndx<71; saIndx++ )
{
// Note that "sectorAddress" is the sector's starting address. Values
// calculated here are as given in the aforementioned Table 3,
// column "(x8)Address Range" 000000h (SA0) through to 3FE000h (SA70)
if ( saIndx < ( ( SHORT_FLASH_SECTOR_ADDRESS & 0x3F0000 ) >> 16 ) )
{ // 32 KWords
sectorAddress = saIndx*LARGE_SECTOR_SIZE;
}
else
{ // 4K Words
sectorAddress = SHORT_FLASH_SECTOR_ADDRESS;
sectorAddress += ( saIndx - ( ( SHORT_FLASH_SECTOR_ADDRESS & 0x3F0000 ) >> 16 ) )*SMALL_SECTOR_SIZE;
}

// Device datasheet Figure 2 - In-System Sector Protect sector algorithm.
flashProtectSector( sectorAddress );

// Feedback.
printf( "Sector Protected %d \n\r", saIndx );

}// for all sectors SA0 through SA70

printf("Boot sector protect complete. Ensure 12VDC has been removed from RESET#.\n\r");
printf( "...\n\r" );
printf("\n\r");

/**NOTE NOT SHOWN --> SYSTEM PAUSED HERE TO REMOVE RESET# Vid 12VDC BEFORE PROCEEDING**/

// The 12VDC shall have been removed from RESET# at this time.
// Reset the flash (FLASH_START_ADDRESS 0x90000000)
p = ( Uint16* )FLASH_START_ADDRESS;
resetFlash(p);

} // flashProtectAllSectors

Hello,

One of our boards has a problem while reading the device id of S25FL064L. Design is consist of the multiplexer, ethernet controller, nor flash, and spi header. We can select either an ethernet controller or spi header. When I selected to spi header, nor flash does not respond to the manufacturer id etc. I can read only 00 from spi emulator.

When I selected to ethernet controller, the MOSI pin seems weird. You may see that the signal level is about 1.6V. Flash also drives the MOSI pin. I think that nor flash was wrongly configured. ( I do not know how it is) It may be in QSPI flash mode. 

Is there any way to exit from this mode using normal spi reading or writing?

Thanks