Problem in reading 512kB data over FSMC with 8bit Asynchronous Muxed NOR configuration.

Hi there,

I have configured ST32F207VGT for FSMC asynchronous muxed NOR configuration, FPGA is connected to the bus at other end.

Following is the FSMC configuration done on MCU

 hnor1.Instance = FSMC_NORSRAM_DEVICE;

 hnor1.Extended = FSMC_NORSRAM_EXTENDED_DEVICE;

 /* hnor1.Init */

 hnor1.Init.NSBank = FSMC_NORSRAM_BANK1;

 hnor1.Init.DataAddressMux = FSMC_DATA_ADDRESS_MUX_ENABLE;

 hnor1.Init.MemoryType = FSMC_MEMORY_TYPE_NOR;

 hnor1.Init.MemoryDataWidth = FSMC_NORSRAM_MEM_BUS_WIDTH_8;

 hnor1.Init.BurstAccessMode = FSMC_BURST_ACCESS_MODE_DISABLE;

 hnor1.Init.WaitSignalPolarity = FSMC_WAIT_SIGNAL_POLARITY_LOW;

 hnor1.Init.WrapMode = FSMC_WRAP_MODE_DISABLE;

 hnor1.Init.WaitSignalActive = FSMC_WAIT_TIMING_BEFORE_WS;

 hnor1.Init.WriteOperation = FSMC_WRITE_OPERATION_ENABLE;

 hnor1.Init.WaitSignal = FSMC_WAIT_SIGNAL_DISABLE;

 hnor1.Init.ExtendedMode = FSMC_EXTENDED_MODE_DISABLE;

 hnor1.Init.AsynchronousWait = FSMC_ASYNCHRONOUS_WAIT_ENABLE;

 hnor1.Init.WriteBurst = FSMC_WRITE_BURST_DISABLE;

 /* Timing */

 Timing.AddressSetupTime = 5;

 Timing.AddressHoldTime = 5;

 Timing.DataSetupTime = 10;

 Timing.BusTurnAroundDuration = 10;

 Timing.CLKDivision = 0;

 Timing.DataLatency = 0;

 Timing.AccessMode = FSMC_ACCESS_MODE_A;

MCU is configured to operate at 120MHz.

We are reading 4 bytes of data over FSMC and sending the same over USB. This procedure we are repeating for 512k times in order to receive and send 2MB of data .

We are able to read nearly 4000Bytes data correctly, data received after that is not proper or zeros (may be sync problem)

Data= *(__IO uint8_t*) (0x60000000 + 0x00 + 0x00);

Above is used to get data from FPGA.

Need suggestions to resolve this sync problem and get product ready.