Nor Flash Forum Discussions

Hi All,

We are using  S29AL008J70TFI010 in one of our projects and I am wondering what would be a logic to keep the life of the device as long as possible. The device is used just as external storage.

I don't want to erase the whole sector if I need to update just one value, so I will have to store the updated value for that variable in the next available memory location and keep doing that until I reach the end of the sector. Then copy all data from all valid addresses to the next sector and erase the previous sector. It seems too complicated for software to keep track of addresses for all variables stored in flash, and to keep updating those addresses every time when a new value is written.

The software keeps those addresses in RAM, so what to do on the next powerup.  They will all be lost. The code will not know the addresses of the data it needs to retrieve from flash on powerup. Is there a simple way of doing that, or some example of higher-level software?

Thank you

Hello,
I am trying to write bit 3 of configuration register 3 in a S25HL250T device.  I see in the data sheet that the bit is only writeable in the nonvolatille memory space address 0x000004. 
My sequence is as follows:
read config 3 using a polling transfer routine // read data = 0x04... I was expecting 0x00 based on the data sheet??
data |=  0x08; //set bit 3 of the write data
WRENB_0_0;// write the write enable bit command 0x06

uint8_t command_buff[5] __attribute__ ((aligned (4)));

command_buff[0] = CYPRESS_WRITE_ANY_REG; //0x71
command_buff[1] = 0x00;
command_buff[2] = 0x00;
command_buff[3] = 0x04;
command_buff[4] = new_reg_data;

MSS_QSPI_polled_transfer_block(3, command_buff, 1, (uint8_t*)0, 0,0); 
//Polled transfer variables =(#address bytes, command, # of bytes after command, read buf, #of read bytes, # of idle cycles)

The write seems to work fine, but the register does not get written.
Any help would be appreciated.

Thanks,

Byron

What are the possible problems when using NOR Flash beyond the operating temperature range to the low temperature side?
Please let me know because it doesn't matter in general terms.

We have found the VERILOG model has issue.

Starting from "SFDP_array[16'h108E] = 8'hFF;", the SFDP array offset does not match with datasheet anymore.

Could you provide a correct VERILOG model which matches S70FS01GS datasheet?

Hi All,

currently we are using following part # S25FL256SAGMFV011 in our design but due to stock not available we are looking for closest match part # which can replace the following part # S25FL256SAGMFV011

I am attempting to use the write buffer programming process to write all 256 16-bit words with the same constant value as part of a device sanitization process. I know the command sequence to run the write to buffer process but I have not had success in simulation. The unlock and setting commands are issued correctly, as is the following writes to all 256 buffers, but the ready signal goes low halfway through writing to the buffers and stays low indefinitely. Attached are three waveform screengrabs of what I am doing and seeing in simulation.

Picture1: Two unlock commands, issue "write to buffer" command at sector address 00, issue number of locations (255) at sector address 00, start loading address/data pairs

Picture2: Ready signal going low halfway through buffer address/data writes

Picture3: Finish buffer address/data writes and issue "write buffer program confirm" command at sector address 00

Hello Everyone:

      We are not able to set 'WEL' bit in Status Register 1, or even read back what is written in Memory. We are using a FPGA to interface with Serial Flash S25FL256S... . Below is the sequence of operations.

• Power up
• Wait for Tpu of 300us
• Read JEDC ID (Instruction 0x1F). Correct data is read back.
• Issue WREN (Instruction 0x6)
• Issue Erase Flash Array (Instruction 0x20, address bits[23:0] = 0x0)
• Wait for 11 seconds
• Issue Status register read (RDSR Instruction 0x05), reads back 0x0. Expect WEL (bit 1 to be set since WREN was issued).
• Issue Page Program (PP, Instruction 0x2, address[23:0] = 0x0, 4 Bytes of data).
• Wait for 2 ms (for page program to complete).
• Read Status 1 register, reads back 0x0.
• Read Flash Array (Instruction, 0xB, address [23:0] = 0x0, ), reads back 0xFF all bytes. So data could not be stored.

    I am attaching some waveforms showing the operations.  The file names of waveforms indicate the type of operation being performed. These waveforms are from Xilinx Vivado ILA. The signal names are mapped as below.

SCK:                      jb_cp_mem_clk_OBUF

CS#:                      cp_pMem_csN_OBUF

IO[3:0]:                cp_mem_in_OBUF[3:0]

Below is some information about the operations shown in the waveforms.

1) Read JED ID & Issue WREN.jpg:    This file shows that reading of JEDEC ID is working. After reading the ID, we are issuing 'WREN' Instruction to set the 'WEL' bit.

2) Erase Flash Array (P4E).jpg:     Before writing we are erasing the sector at address 0x0.

3) Read Status register 1, RDSR1 .jpg:    Reading Status Register 1, read back data is 0x0.

4) Page Program & Read Status Register.jpg:   Write data to memory and read Status Register 1, read back data is still 0x0, WIP bit not set.

5) Read Status Register & Read Flash Array.jpg:  Read status register and read data from memory. Status register is still 0x0 and data read from memory is all 0xFF. Four bytes were written and four bytes read back.

     Did we miss anything from the datasheet? Are we doing something incorrectly? Please help!

Thank you so much.

Best regards,

We already qualified S25FL512SDSMFB010 (Cypress part) in our boards however, I found some failure recently and also found there is the a Spansion Mark on the failed parts. So what is the difference?

Hi,

I would like to know the Junction- Case Thermal Resistance and Max Junction Temperature for S25FL256SAGMFI001.

Thanks,

Prathik

Is there any equal 4KB erase sector SPI Nor Flash solution in Infineon portfolios?

I checked  in Semper series and S25FL/FS, S70FL/FS,  all of them are uniform 256KB erase sector,  or hybird sector architechture(4KB in top/bottom, rest is 256KB).

Need your confirmation, thanks