2 Replies Latest reply on Nov 7, 2017 4:33 PM by user_512313589

    Device ID definition of S25FL064L and S25FL064P

    user_512313589

      The output of RDID command (JEDEC 9Fh) is different between S25FL064L and S25FL064P.

      S25FL064L    RDID command (JEDEC 9Fh)

      Byte Address, Data, Description

      00h         01h Manufacturer

      01h         60h Device ID – Memory Interface Type

      02h        17h Device ID – Density and Features

      03h         Undefined     - Reserved for future use

       

      S25FL064P    RDID command(JEDEC 9Fh)

      Byte Address, Data, Description

      00h         01h Manufacturer

      01h         02h Device ID

      02h         16h Device ID

      03h         4Dh # extended bytes

       

      Questions;

      (1) Please tell me the definition of the registration data.

      The first data ”01h” shows Cypress, I understand.

      But I don’t understand why the second and the third are “60h-17h”’S25FL064L”, and “02h-16h”’S25FL064L”

      (2) Why is the third different? I understand that this represents memory’s density, so I expected these are same data.

      Best regards,

        • 1. Re: Device ID definition of S25FL064L and S25FL064P
          gsns

          Hello Saito San,

           

          (1) Please tell me the definition of the registration data.

          The first data ”01h” shows Cypress, I understand.

          But I don’t understand why the second and the third are “60h-17h”’S25FL064L”, and “02h-16h”’S25FL064L”

          A) The first byte is assigned by JEDEC.

          The second and third are manufacturers choice. So internally our Flash Business team  has decided 60h for FL-L and 02h for FL-P for second byte. Similarly for the third byte. There is no special/specific  reason.

           

          (2) Why is the third different? I understand that this represents memory’s density, so I expected these are same data.

          A) For the latest devices we are using 17h for 64Mb density. For older devices we used 16h. Even for 64Mb FS-S device it is 17h.

          so 17h is latest convention for 64Mb density.

           

          Thanks,

          Krishna.