Different committee's --- Different standards. There is no issue with overlap. On Sep 15, 2011, at 4:58 AM, Girish K S wrote: > Dear all, > The eMMC 4.5 specification mentions that the CMD21 in > class 2 is a SEND_TUNING BLOCK command. where as the SD card > specification > in the given link says CMD19 in class 2 is the SEND_TUNING_BLOCK > http://www.scribd.com/doc/50685191/53/Figure-4-8-Send-Tuning-Block-Command. > Also the implementation in the drivers/mmc/host/sdhci.c uses the CMD19 > as the SEND_TUNING_BLOCK. > Can anybody clarify why there is overlapping in this command number. > May be my understand is wrong. > > In the MMC spec the CMD19 is BUS_TEST_W in class 0 and CMD21 is > reserved till eMMC 4.41 version. > But in the SD specification (given link) CMD19 is SEND_TUNING_BLOCK > and CMD21 is reserved. > > Thanks and regards > Girish K S > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
