hi all: Sorry for not making my description more clearer. in ehci controller, 1. is it possible to know the period bandwidth in a frame from sys or other additional configuration? 2. is it possible to know how many bits in SMASK and CMASK are assigned to 1 in a frame? thanks for your help in advance, -- 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