2 Replies Latest reply on May 23, 2013 4:31 AM by user_74237027

    FX3 Sync Slave FIFO: 2 additional words on read

    christian.richter

      No I have the FX3 DVK board connected to our FPGA board and try to set up the sync slave FIFO connetion. If I send data from host to the OUT EP, the FX3 delivers 2 additional words before the transmitted data. How can I setup the FX3 correctly to avoid this? I set up the endpoints and sockets in this way:

         

       

         

      #define CY_FX_EP_PRODUCER               0x06    /* EP 6 OUT */
      #define CY_FX_EP_CONSUMER               0x82    /* EP 2 IN */

      #define CY_FX_EP_PRODUCER_USB_SOCKET    0x06    /* USB Socket 6 is producer */
      #define CY_FX_EP_CONSUMER_USB_SOCKET    0x02    /* USB Socket 2 is consumer */

      /* Used on FX3 silicon. */
      #define CY_FX_EP_PRODUCER_PPORT_SOCKET    CY_U3P_PIB_SOCKET_0    /* P-port Socket 0 is producer */
      #define CY_FX_EP_CONSUMER_PPORT_SOCKET    CY_U3P_PIB_SOCKET_1    /* P-port Socket 1 is consumer */

         

      And set up the GPIF II to connect the flags fixed to the threads:

         

       

         

          {CY_U3P_PIB_GPIF_CTRL_BUS_SELECT_ADDRESS(4)      , 0x00000011},    //FLAGA = Fixed to Thread 1
          {CY_U3P_PIB_GPIF_CTRL_BUS_SELECT_ADDRESS(5)      , 0x00000010},    //FLAGB = Fixed to Thread 0

         

       

         

      This works well, but there are 2 cycles with 0x0000 data in the FIFO. Do I have to use the partial flags with watermark value? Is yes, how to configure?

         

      Attached you can find the ChipScope output for this beha