USB Hound抓图如下：
Bus Hound 6.01 capture on Windows XP Service Pack 2 (x86). Complements of www.perisoft.net
Device - Device ID (followed by the endpoint for USB devices)
(7) Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C8
(17) USB Root Hub
(23) Unknown Device
(27) USB ÈËÌåѧÊäÈëÉ豸
(28) HID Keyboard Device
Phase - Phase Type
CTL USB control transfer
IN Data in transfer
Data - Hex dump of the data transferred
Descr - Description of the phase
Cmd... - Position in the captured data
Device Phase Data Description Cmd.Phase.Ofs(rep)
------ ----- ------------------------ ---------------- ------------------
17 IN 1.1.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 2.1.0
17.0 IN 00 01 01 00 .... 2.2.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 3.1.0
17.0 IN 00 01 01 00 .... 3.2.0
17.0 CTL 23 01 10 00 01 00 00 00 CLEAR FEATURE 4.1.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 5.1.0
17.0 IN 00 01 00 00 .... 5.2.0
17.0 CTL a3 00 00 00 02 00 04 00 GET STATUS 6.1.0
17.0 IN 00 01 00 00 .... 6.2.0
17 IN 7.1.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 8.1.0
17.0 IN 01 01 01 00 .... 8.2.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 9.1.0
17.0 IN 01 01 01 00 .... 9.2.0
17.0 CTL 23 01 10 00 01 00 00 00 CLEAR FEATURE 10.1.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 11.1.0
17.0 IN 01 01 00 00 .... 11.2.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 12.1.0
17.0 IN 01 01 00 00 .... 12.2.0
17.0 CTL 23 03 04 00 01 00 00 00 SET FEATURE 13.1.0
17 IN 14.1.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 15.1.0
17.0 IN 03 01 10 00 .... 15.2.0
17.0 CTL 23 01 14 00 01 00 00 00 CLEAR FEATURE 16.1.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 17.1.0
17.0 IN 03 01 00 00 .... 17.2.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 18.1.0
17.0 IN 03 01 00 00 .... 18.2.0
17.0 CTL 23 03 04 00 01 00 00 00 SET FEATURE 19.1.0
17 IN 20.1.0
17.0 CTL a3 00 00 00 01 00 04 00 GET STATUS 21.1.0