Am Montag, den 12.03.2018, 12:09 +0530 schrieb Tushar Nimkar: > Hi, > Can u please help me in getting UAS spec.? > I have "UASP Revision 1.0" but which is very old. > > Want to understand what this "uas-tags"/ "initiator transfer tags" mean. > For only one case transfer (Command IU) it is 0x0002 rest case it is 0x0001 > > Please provide any link so that I can download spec. > Any help on "tags" is welcome. Hi, UAS in contrast to usb-storage can operate multiple SCSI commands at the same time. Therefore the host and the device must have a way to identify commands so that status and error reports can be attributed to the correct command. The way to do that is the tag, which is basically just a number the host assigns to a command. The range of tags you use is determined by the number of streams that are supported, so that each tag can be linked to a stream, meaning that data transfers are independent of each other. HTH Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
