标题: EMMC 的8位数据线是否可以颠倒顺序？ [打印本页] 作者: yujingfa 时间: 2015-5-18 16:51 标题: EMMC 的8位数据线是否可以颠倒顺序？ 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。/ Y# u5 u% A* ]" R5 I$ s 作者: 超級狗 时间: 2015-5-26 11:41
JESD84-A44 ! h4 ]2 }$ k' A5 i- TDAT0-DAT7: These are bidirectional data channels. The DAT signals operate in push-pull mode. Only 2 o/ v- H9 h- }, B6 Dthe card or the host is driving these signals at a time. By default, after power up or reset, only DAT0 is ( L9 f1 V" u, }2 O) {/ GJEDEC 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. / i% p2 y9 ]; A % L0 g- v( h& A; b- w) G9 ?作者: smile216 时间: 2015-6-24 10:34
不能，颠倒了识别都过不了，无法使用作者: fallen 时间: 2016-12-4 23:47
不能颠倒，有X1,X4,X8模式，分别使用DATA0;DATA0-3;DATA0-7；
