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eMMC失效模式分析

更新时间:2020-01-01 15:03:36 大小:3M 上传用户:xuzhen1查看TA发布的资源 标签:emmc失效模式 下载积分:1分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

资料介绍

1.еммс 初始化失败

A.确认host支持V4.57

->host可能不支持V4.5,造成无法识别到 device type

->利用CMD8读出EXT-CSD

确认Initial CMD flow是否正确?

Power-p

1.Apply power to the bus,comantnication voltage range(2.7-3.6V72.Set clock to 400KHz or less

3.Wait for 1ms,then wait for 74 more clock cvcles

4.Send CMDO to reset the bus,keep CS line high during this step.

5.Send CMDI.with the intended voltage range in the argument(either OxOOFF8000 0g

0x00000080)

6.Receive R37.If the OCR busy bit is"0',repeat steps 5 and 6

.From the R3 response argument the host can lean if the Device is a Hisah Voltage or Dual Voltage Device.If the argament is OoxS0FF8000 the Device is only High Voltage.if the argument is Ox8OFFS0SO the Detice is Dual Voltage

9.If R3 renumed some other value,the Device is not compliant(since it should have put itself into inactine state.due to voltage incompatibility.and not respond):in such a case the host must power down the bus and start its enror recovery procedure


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eMMC失效模式分析.pdf 3M

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