2 Replies Latest reply on Nov 10, 2014 9:21 PM by userc_42101

    Why memory read failed while I set size to 0x4004, 0x4008, until 0x4018



      Each time I tried to burst read size 0x4004, 0x4008 until 0x4018 or 0x8004, 0x8008 until 0x8018, it pop out "[ERR:] Burst read failed".  I have aleardy used DDR (1G Byte) to replace original 16KB Bram.




      Except these size, it can burst write, read and verify success. Do I need to modify source code in order to handle this problem. Because I am writing a .dll based on CyAPI.lib reference to FMCFx3RefDesign.




      Any advice will be appreciated.

        • 1. Re: Why memory read failed while I set size to 0x4004, 0x4008, until 0x4018

           I'm not familiar with how "FMCFx3RefDesign" is implemented. If you can give us more details on how the firmware does memory reads and how FMCFx3RefDesign tries to do these reads, we can debug further.

          • 2. Re: Why memory read failed while I set size to 0x4004, 0x4008, until 0x4018





            The device information is as following:






            Device Name :TB-FMCL-USB30(ver:01.20)


            Manufacturer Name   :TED  (VID-04EC PID-F001)


            Speed       :SuperSpeed


            BULK OUT,   MaxPktSize 12288 Bytes, MaxBurst 11, 0x01


            BULK IN,      MaxPktSize 12288 Bytes, MaxBurst 11, 0x81


            BULK OUT,   MaxPktSize 1024 Bytes, MaxBurst 0, 0x02




            Code about burst read is as following shown:




            #define MAX_BRAMSIZE (0x40000000) // 1G Byte






            typedef struct __tagCMDPKT{


            ULONG cmdcode;


            ULONG address;


            ULONG length;


            ULONG resv;


            }CMDPKT, *PCMDPKT;






            bool APICmd::EP2CmdRequest(CCyUSBEndPoint *ept, ULONG cmdcode, ULONG address, ULONG length)




            bool retstatus;


            CMDPKT tcmdpkt;


            PBYTE pdatabuf;


            LONG datalen;


            //OVERLAPPED ioOvLap;




            // endpoint is null or not


            if (ept==NULL) return FALSE;




            // set the cmd packet parameters


            tcmdpkt.cmdcode = cmdcode;


            tcmdpkt.address = address;


            tcmdpkt.length  = length/sizeof(ULONG);


            tcmdpkt.resv    = 0;




            pdatabuf= (PBYTE)(&tcmdpkt);


            datalen = sizeof(CMDPKT);




            retstatus = ept->XferData(pdatabuf, datalen, FALSE);




            return retstatus;








            bool APICmd::MemoryRead(ULONG Offset, ULONG ntotalsize, BYTE *pBuffer)




            string str;


            LONG nunitsize;


            ULONG nrestsize;


            OVERLAPPED inOvLap;


            bool success = false;






            // get the data from USB




            nrestsize= ntotalsize;


            inOvLap.hEvent  = CreateEvent(NULL, false, false, "CYUSB_IN"); 






            // set the offset and start the transfer


            if (EP2CmdRequest(CmdEndpt, CMD_MEM_READ, Offset, ntotalsize))




            for (BYTE * tempBuf = pBuffer; nrestsize != 0; tempBuf += nunitsize, nrestsize -= nunitsize)




            nunitsize = (nrestsize > MAX_BRAMSIZE) ? MAX_BRAMSIZE : nrestsize;




            // transfer the data


            // -----------Asynchronous method---------------------//


            UCHAR  *outContext = InEndpt->BeginDataXfer(tempBuf, nunitsize, &inOvLap);




            success = InEndpt->FinishDataXfer(tempBuf, nunitsize, &inOvLap, outContext); 




            if(success == false) break;






            //stop transfer(none)








            success = false;






            // close






            // set the status bar


            return success;








            The attachment is FMFCFx3RefDesign document which I refered to. If it is still not enough to reach sticking point, then I can provide source code directly.




            Any advice will be appreciated. Best Regard.