列增大>8位时STM32F429 FMC问题

Question

当连接64 FMC IS42S16400J-7BLI时，我与FMC控制器有问题。我正在使用CubeMX设置基本配置

static void MX_FMC_Init(void)
{
  FMC_SDRAM_TimingTypeDef SdramTiming;

  /** Perform the SDRAM1 memory initialization sequence
  */
  hsdram1.Instance = FMC_SDRAM_DEVICE;
  /* hsdram1.Init */
  hsdram1.Init.SDBank = FMC_SDRAM_BANK1;
  hsdram1.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_11;
  hsdram1.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
  hsdram1.Init.MemoryDataWidth = FMC_SDRAM_MEM_BUS_WIDTH_16;
  hsdram1.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
  hsdram1.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
  hsdram1.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
  hsdram1.Init.SDClockPeriod = FMC_SDRAM_CLOCK_PERIOD_2;
  hsdram1.Init.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
  hsdram1.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_0;
  /* SdramTiming */
  SdramTiming.LoadToActiveDelay = 2;
  SdramTiming.ExitSelfRefreshDelay = 7;
  SdramTiming.SelfRefreshTime = 4;
  SdramTiming.RowCycleDelay = 7;
  SdramTiming.WriteRecoveryTime = 3;
  SdramTiming.RPDelay = 2;
  SdramTiming.RCDDelay = 2;

  if (HAL_SDRAM_Init(&hsdram1, &SdramTiming) != HAL_OK)
  {
    Error_Handler();
  }

}

并配置内存

void SDRAM_Initialization_Sequence(SDRAM_HandleTypeDef* hsdram, FMC_SDRAM_CommandTypeDef* Command)
{
    __IO uint32_t tmpmrd = 0;
    /* Step 3:  Configure a clock configuration enable command */
    Command->CommandMode           = FMC_SDRAM_CMD_CLK_ENABLE;
    Command->CommandTarget         = FMC_SDRAM_CMD_TARGET_BANK1;
    Command->AutoRefreshNumber     = 1;
    Command->ModeRegisterDefinition = 0;

    /* Send the command */
    HAL_SDRAM_SendCommand(hsdram, Command, 0x1000);

    /* Step 4: Insert 100 ms delay */
    HAL_Delay(100);

    /* Step 5: Configure a PALL (precharge all) command */
    Command->CommandMode           = FMC_SDRAM_CMD_PALL;
    Command->CommandTarget         = FMC_SDRAM_CMD_TARGET_BANK1;
    Command->AutoRefreshNumber     = 1;
    Command->ModeRegisterDefinition = 0;

    /* Send the command */
    HAL_SDRAM_SendCommand(hsdram, Command, 0x1000);

    /* Step 6 : Configure a Auto-Refresh command */
    Command->CommandMode           = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
    Command->CommandTarget         = FMC_SDRAM_CMD_TARGET_BANK1;
    Command->AutoRefreshNumber     = 4;
    Command->ModeRegisterDefinition = 0;

    /* Send the command */
    HAL_SDRAM_SendCommand(hsdram, Command, 0x1000);

    /* Step 7: Program the external memory mode register */
    tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_2          |
             SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL   |
             SDRAM_MODEREG_CAS_LATENCY_3           |
             SDRAM_MODEREG_OPERATING_MODE_STANDARD |
             SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;

    Command->CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
    Command->CommandTarget         = FMC_SDRAM_CMD_TARGET_BANK1;
    Command->AutoRefreshNumber     = 1;
    Command->ModeRegisterDefinition = tmpmrd;

    /* Send the command */
    HAL_SDRAM_SendCommand(hsdram, Command, 0x1000);

    /* Step 8: Set the refresh rate counter */
    /* (15.62 us x Freq) - 20 */
    /* Set the device refresh counter */
    HAL_SDRAM_ProgramRefreshRate(hsdram, REFRESH_COUNT);
}

存储器和微电路按照原理图连接。

我只能用8位寻址。在这种配置中，一切都是完美的，即我可以在调试窗口中读取/写入值并观察它们。不过，它限制了我的内存容量只有8MB。

当我在9/10/11位以下的设置中修改8位以获得更多可用内存时，它就会启动故障，即某些内存区域中的垃圾。

​

我做了定制板，但同样的问题，你会发现在STM32F429-迪斯科板。所以我拒绝这种联系。我试着玩“从行到列的延迟”这样的时间延迟，并增加所有可能的延迟，但不是运气。任何帮助都将不胜感激。

Answer 1

来自IS42S16400J-7BLI数据表：

内部配置为具有同步接口的四行DRAM。每个16,777,216位银行被组织为4,096行，由256列和16位组成.

因此，您应该在ColumnBitsNumber中使用8位。您将得到8兆字节(64 MBits/8)的内存。