EMMC 的8位数据线是否可以颠倒顺序？

yujingfa

DDR的数据线是可以相互颠倒顺序的。现在不知道EMMC 的8位数据线是否可以颠倒顺序。能颠倒顺序就好！请大侠指导一下！并帮忙解释。

fallen

不能颠倒，有X1,X4,X8模式，分别使用DATA0;DATA0-3;DATA0-7；

smile216

不能，颠倒了识别都过不了，无法使用

超級狗

JESD84-A44
; T1 x. A; w+ }* I2 y5 F) EDAT0-DAT7: These are bidirectional data channels. The DAT signals operate in push-pull mode. Only
: j0 J* u! M8 h) ~the card or the host is driving these signals at a time. By default, after power up or reset, only DAT0 is
3 V/ _6 v! V2 T: z: HJEDEC Standard No. 84-A44 Page 15 used for data transfer. A wider data bus can be configured for data transfer, using either DAT0-DAT3 or DAT0-DAT7, by the MultiMediaCard controller. The MultiMediaCard includes internal pull-ups for data lines DAT1-DAT7. Immediately after entering the 4-bit mode, the card disconnects the internal pull ups of lines DAT1, DAT2, and DAT3. Correspondingly, immediately after entering to the 8-bit mode the card disconnects the internal pull-ups of lines DAT1–DAT7.