12 Replies Latest reply on Jul 5, 2017 6:51 PM by TakahiroK_16

    ZYNQ with S25FL512SAG in QSPI mode, random loss of data

    diego.diaz_2563661

      Hi,

         

      I have a design that is lossing data randomly after a power cycle. The design consist of a Zynq using S25FL512SAG dual SS, 4 bit stacked in QSPI boot mode. 

         

      There are pull-downs on MIO2, MIO3, MIO4, and MIO6; those pins are connected to the memory. I scope all this signals and all look normal except for MIO4 (W#,DQ2 pin on the memory), see attached image, (Yellow - MIO4/Magenta - Clock).

         

      After a review on the forum I read that there is a Pull-Up circuit on WP#, could that be the cause of the unusual behavior on that pin?

         

      Could that also be the cause of the random loss of data after power-up?

         

      I appreciate any help - pointer on this.

         

      Thanks,

         

      Diego