hi all: 2010/7/20 loody <miloody@xxxxxxxxx>: > 2010/7/20 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: >> On Mon, 19 Jul 2010, loody wrote: >> >>> hi >>> >>> 2010/7/19 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: >>> > On Mon, 19 Jul 2010, loody wrote: >>> > >>> >> Dear all: >>> >> below are my questions about USB: >>> >> 1. from the spec, it says when we receive STS_FATAL, we need to reset >>> >> the host and re-initial the host. The Note of section 4.15.2.4. >>> sorry, the document I mentioned is USB2.0 spec. >> The USB-2.0 specification does not have any section 4.15.2.4. Chapter >> 4 ends with section 4.10. > opps :) > it is ehci instead of USB spec. > sorry for picking this old thread, since the subject is the same. my question is: In high speed device and an urb->inerval is less than 8, take 2 or 4 for example, the number of iso transfer descriptors will be 1+(span+7)/8. But the formula above seems to be used for urb-> interval =1, right? Why the # of iso transfer descriptors not to be span/interval but 1+(span+7)/8? Regards -- 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
