Nor Flash Forum Discussions

I modified the vhdl model to default the Configuration Register to QUAD mode.  This bit is non-volatile.  So, i wanted to have the chip default to what it would be in my system after having programmed that bit.

 -- *** Configuration Register 1 ***
--SHARED VARIABLE Config_reg1 : std_logic_vector(7 downto 0) := (others => '0');
SHARED VARIABLE Config_reg1 : std_logic_vector(7 downto 0) := x"02";

I also modified the processes below to properly set the _pullup to a valid value if QUAD = '1' (not 0)

HOLD_PULL_UP : PROCESS(HOLDNegIn)
BEGIN
  IF (QUAD = '0') THEN
    IF (HOLDNegIn = 'Z') THEN
      HOLDNeg_pullup <= '1';
    ELSE
      HOLDNeg_pullup <= HOLDNegIn;
    END IF;
  ELSE
    HOLDNeg_pullup <= HOLDNegIn;
  END IF;
END PROCESS HOLD_PULL_UP;

WP_PULL_UP : PROCESS(WPNegIn)
BEGIN
  IF (QUAD = '0') THEN
    IF (WPNegIn = 'Z') THEN
      WPNeg_pullup <= '1';
    ELSE
      WPNeg_pullup <= WPNegIn;
    END IF;
  ELSE
    WPNeg_pullup <= WPNegIn;
  END IF;
END PROCESS WP_PULL_UP;

When I do a READ (QIOR4) the data that comes back is NOT what was preloaded in the memory.

I did set UserPreload to TRUE.  Everything works fine when operating in QUAD=0 mode and doing a FAST_READ4.  The proper data comes back.

I am using the s25fl512s.mem file and I am reading from address 0x0000000.

I should see 01 02 03 04 ... coming back.

From the .mem file:

@0000000
01
02
03
04
05

Instead I see:

10
01
32
22
FF

Any ideas what is going on?  The .docx file may be easier to view and zoom in on.

We are trying to measure the Sector Erase time for S29GL032N.

We want to know how the Min and Max given in the datasheet (0.5 Sec and 3.5Sec) (Page 70) are mentioned. What are the test conditions and which sectors these readings are applicable?

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

Hi,

Now I use S25HS512T flash chip in our project, and need SDK for the chip of your product.

I have submitted download request, but that request has not been progressed. So I hope you can deal it early!

Thank you!