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nafikovr
nafikovr
Associate
June 28, 2016
Question

stm32f746bg and MX30LF2G NAND Flash

  • June 28, 2016
  • 2 replies
  • 705 views
Posted on June 28, 2016 at 14:55

FMC Configured as 

hnand1.Instance = FMC_NAND_DEVICE;
/* hnand1.Init */
hnand1.Init.NandBank = FMC_NAND_BANK3;
hnand1.Init.Waitfeature = FMC_NAND_WAIT_FEATURE_ENABLE;
hnand1.Init.MemoryDataWidth = FMC_NAND_MEM_BUS_WIDTH_8;
hnand1.Init.EccComputation = FMC_NAND_ECC_DISABLE;
hnand1.Init.ECCPageSize = FMC_NAND_ECC_PAGE_SIZE_2048BYTE;
hnand1.Init.TCLRSetupTime = 2;
hnand1.Init.TARSetupTime = 2;
/* hnand1.Info */
hnand1.Info.PageSize = 2048;
hnand1.Info.SpareAreaSize = 64;
hnand1.Info.BlockSize = 64;
hnand1.Info.BlockNbr = 2048;
hnand1.Info.ZoneSize = 2048;
/* ComSpaceTiming */
ComSpaceTiming.SetupTime = 0x5;
ComSpaceTiming.WaitSetupTime = 0x3;
ComSpaceTiming.HoldSetupTime = 0x2;
ComSpaceTiming.HiZSetupTime = 0x5;
/* AttSpaceTiming */
AttSpaceTiming.SetupTime = 0x5;
AttSpaceTiming.WaitSetupTime = 0x3;
AttSpaceTiming.HoldSetupTime = 0x2;
AttSpaceTiming.HiZSetupTime = 0x5;
HAL_NAND_Init(&hnand1, &ComSpaceTiming, &AttSpaceTiming);

after firsy calling HAL_NAND_Read_ID() MCU generates 32 NRE strobes (why 32 times if readed only 32 bits?) and return valid data. if i call this function one more time no NRE strobes has been generated, but function return valid data. also i try to read ONFI signature after reading ID and no NRE strobes and reading returns last readed data (ID). somebody can help with this problem?
    This topic has been closed for replies.

    2 replies

    troy1818
    troy1818
    Associate III
    June 28, 2016
    Posted on June 28, 2016 at 15:49

    Hi,

    It is very important that the configuration is correct. From the spec:

     2G-bit/4G-bit SLC NAND Flash- Bus: x8

    - Page size: (2048+112) byte,

    - Block size: (128K+7K) byte,

    - Plane size:1024-block/plane x 2 for 2Gb

    User Redundancy

    - 112-byte attached to each page

    If you are unsure about timing then just crank up the values somewhat for the timing and see if anything changes.

    waclawek.jan
    waclawek.jan
    Super User
    June 28, 2016
    Posted on June 28, 2016 at 20:02

    You're probably hit by a cache-gotcha. While [DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/STM32F7%20NOR%20memory%20with%20FMC&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=511]this thread deals with NOR FLASH which is at Bank1, the Bank3 area is AFAIK cached by default too.

    JW

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