Posted on January 30, 2018 at 11:14Hello.,
I am working on STM32F7 microcontroller , need to access external memory device through parallel bus (8 bit bus width). The external memory doesn't support RDY signal so that I need to add internal wait state , But I don't find which parameter need to set add internal wait state.
Can anyone suggest me which register I need to configure.
Presently I configure FMC controller as fallows ;-
hnor1.Instance = FMC_NORSRAM_DEVICE;
hnor1.Extended = FMC_NORSRAM_EXTENDED_DEVICE;
/* hnor1.Init */
hnor1.Init.NSBank = FMC_NORSRAM_BANK4;
hnor1.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_DISABLE;
hnor1.Init.MemoryType = FMC_MEMORY_TYPE_NOR;
hnor1.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_8;
hnor1.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
hnor1.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW;
hnor1.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
hnor1.Init.WriteOperation = FMC_WRITE_OPERATION_ENABLE;
hnor1.Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE;
hnor1.Init.ExtendedMode = FMC_EXTENDED_MODE_ENABLE;
hnor1.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE;
hnor1.Init.WriteBurst = FMC_WRITE_BURST_DISABLE;
hnor1.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ASYNC;
hnor1.Init.WriteFifo = FMC_WRITE_FIFO_ENABLE;
hnor1.Init.PageSize = FMC_PAGE_SIZE_NONE;
/* Timing */
Timing.AddressSetupTime = 15;
Timing.AddressHoldTime = 15;
Timing.DataSetupTime = 255;
Timing.BusTurnAroundDuration = 15;
Timing.CLKDivision = 16;
Timing.DataLatency = 17;
Timing.AccessMode = FMC_ACCESS_MODE_A;
/* ExtTiming */
ExtTiming.AddressSetupTime = 15;
ExtTiming.AddressHoldTime = 15;
ExtTiming.DataSetupTime = 255;
ExtTiming.BusTurnAroundDuration = 15;
ExtTiming.CLKDivision = 16;
ExtTiming.DataLatency = 17;
ExtTiming.AccessMode = FMC_ACCESS_MODE_A;
Thank you.,
#parallel #fmc #stm32f765bit
