| 摘要 |
<p>The invention provides a method of measuring the propagation time of signals from a USB host to a USB device within a USB tree, comprising designating a master USB device in said USB tree, generating or designating specified signal structures for transmission in the USB data traffic, transmitting said specified signal structures to said USB device in a predefined sequence, monitoring said USB traffic by means of said master USB device for said specified signal structures and for specified response signals from said USB device, generating event triggering signals local to said master USB device corresponding to decoding of said specified signal structures, generating event triggering signals local to said master USB device corresponding to decoding of response signals from said USB device, measuring a time interval between said event triggering signals in said master USB device, and determining a propagation time from said USB host to said USB device from said time interval.</p> |
