1 Reply Latest reply on May 17, 2015 8:59 PM by hu.jianhua

    fx3 slavefifo flag problem

    hu.jianhua

       hi,everyone,

         

        I am using FX3 cy3014 to develop a data transmission device. The firmware used is  AN65974 salvefifo mode.

         

        But I found that when I sent 1024B data using Control Center, the FLAGC(Empty flag dedicated to thread3) was high. Until I had sent 16KB data (DMA buffersize is 16KB) it became low. When I sent 1023B or any other ,the FLAGC became low immediately. Why I can not send 1024KB data ?

         

        

         

        Another problem , when I sent 256B data by FPGA to fx3 using short packet, The Control Center couldn't read data till timeout. But I sent 255B data ,the Control Center could read back immediately, Why ?

         

       

         

        Thanks very much.

         

        

         

        regards,

         

        hujianhua.