[问答]

为什么FMC总线总是将外部SDRAM操作复制到另一个地址位置上呢？

问答对人有帮助，内容完整，我也想知道答案 0 我通过 FMC 总线将 STM32F469 与外部 SDRAM (Alliance AS4C16M16MSA-6BIN) 一起使用。STM32F469 和 AS4C16M16MSA-6BIN 均在 1.8V 下运行。FMC 总线配置有 13 个地址引脚和 16 个数据引脚，如下所示： hsdram1.Instance = FMC_SDRAM_DEVICE; /* hsdram1.Init / hsdram1.Init.SDBank = FMC_SDRAM_BANK1; hsdram1.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_9; hsdram1.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_13; 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_1; / Timing configuration for 75 MHz of SDRAM clock frequency () / SdramTiming.LoadToActiveDelay = 2; SdramTiming.ExitSelfRefreshDelay = 7; SdramTiming.SelfRefreshTime = 4; SdramTiming.RowCycleDelay = 7; SdramTiming.WriteRecoveryTime = 2; SdramTiming.RPDelay = 2; SdramTiming.RCDDelay = 2; 而SDRAM配置为： __IO uint32_t tmpmrd = 0; / Step 1: 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(&hsdram1, &Command, SDRAM_TIMEOUT); / Step 2: Insert 100 us minimum delay / / Inserted delay is equal to 1 ms due to systick time base unit (ms) / HAL_Delay(1); / Step 3: 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(&hsdram1, &Command, SDRAM_TIMEOUT); / Step 4: Configure an 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(&hsdram1, &Command, SDRAM_TIMEOUT); / Step 5: Program the external memory mode register / tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_1 \| 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(&hsdram1, &Command, SDRAM_TIMEOUT); / Step 6: Set the refresh rate counter / / Set the device refresh rate / HAL_SDRAM_ProgramRefreshRate(&hsdram1, RefreshCount); 我正在 SDRAM 上运行地址总线测试。 datum BSP_SDRAM_MemTestAddressBus(volatile datum * baseAddress, uint32_t nBytes) { uint32_t addressMask = (nBytes/sizeof(datum) - 1); uint32_t offset; uint32_t testoffset; datum pattern = (datum) 0xAAAAAAA; datum antipattern = (datum) 0x55555555; /* * Write the default pattern at each of power-of-two offsets * / for (offset = 1; (offset & addressMask) != 0; offset ++) { (__IO uint32_t) (SDRAM_DEVICE_ADDR + 4offset) = pattern; } /* * Write the default pattern at each of power-of-two offsets * / for (offset = 1; (offset & addressMask) != 0; offset <<= 1) { baseAddress[offset] = pattern; } / * Check for address bits stuck high. * / testoffset = 2; baseAddress[testoffset] = antipattern; for (offset = 1; (offset & addressMask) != 0; offset <<= 1) { if (baseAddress[offset] != pattern) { return ((datum ) &baseAddress[offset]); } } baseAddress[testoffset] = pattern; /* * Check for address bits stuck low or shorted. * / for (testoffset = 1; (testoffset & addressMask) !=0; testoffset <<=1) { baseAddress[testoffset] = antipattern; if (baseAddress[0] != pattern) { return ((datum ) &baseAddress[testoffset]); } for (offset = 1; (offset & addressMask) != 0; offset <<=1) { if ((baseAddress[offset] != pattern) && (offset != testoffset)) { return ((datum ) &baseAddress[testoffset]); } } baseAddress[testoffset] = pattern; } return (NULL); }/ memTestAddressBus() */ 问题是，当访问一个地址时，它总是将操作复制到另一个地址位置。内存读取如下：我简单的写了0xAAAAAAA到0xC00000004这个位置，同时更新了0xC0000000C里面的数据。关于这个问题有什么建议吗？提前致谢。 0
2023-1-6 08:37:36　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × wang21cj 该类别下有 44 个回答。邀请回答新星之火12138 该类别下有 41 个回答。邀请回答 chm5 该类别下有 39 个回答。邀请回答 hgimtk 该类别下有 33 个回答。邀请回答 HengDu 该类别下有 30 个回答。邀请回答 hwp0415229 该类别下有 28 个回答。邀请回答 jghgfdssas 该类别下有 28 个回答。邀请回答可口可甜该类别下有 26 个回答。邀请回答 kingnet6688 该类别下有 26 个回答。邀请回答颜刚YanG 该类别下有 26 个回答。邀请回答 zyh34997 该类别下有 25 个回答。邀请回答柱子图宁该类别下有 25 个回答。邀请回答 jenny042 该类别下有 25 个回答。邀请回答 kingnet9999 该类别下有 25 个回答。邀请回答 andyfly7 该类别下有 25 个回答。邀请回答麻酱该类别下有 25 个回答。邀请回答成长的小师弟该类别下有 24 个回答。邀请回答 gXDhn 该类别下有 24 个回答。邀请回答 jiangwenwen 该类别下有 24 个回答。邀请回答哼小曲该类别下有 24 个回答。邀请回答举报张国厚相关推荐 • 可以将一个TouchGFX项目之间的屏幕、对象和交互复制到另一个项目吗？ 393 • 电路从一个原理图复制到另一个原理图时元件消失或错位 9859 • 复制DDR，如何差分走线到另一个板上 8366 • ch559连接两个U盘能不能把一个U盘里的一个620kb文件复制到另一个U盘里？ 538 • 如何引导BootROM将代码复制到内部RAM ？ 288 • 关于RAM地址增量的问题 1112 • 怎么解决oflash复制到system32后运行总是跳出的问题？ 850 • PROTEL99SE中如何把元器件的封装直接复制到另一块PCB板上 13096 • 我的第二个裸板程序之链接地址与存储地址之间有什么联系？ 1385 • 将字体表复制到sdram中使用显示错误是什么原因导致的 182 1个回答

答案对人有帮助，有参考价值 0 我们最终通过更换新的 SDRAM 解决了问题，看来故障很可能是由 BGA SDRAM 上的焊接不良引起的。

2023-1-6 10:23:10 评论举报顾鸿兰