Technical data

22 Notes on USB Electrical Compliance Testing
2 Preparing to Take Measurements
High-Speed Electrical Test Bed Computer
The high- speed electrical test bed computer hosts a USB 2.0 compliance
host controller for hi- speed hub or device electrical test, or serves as a
test bed host for a USB 2.0 host controller under test. For instructions on
configuring this computer, refer to the High- Speed Electrical Test Toolkit
Setup Instruction document which comes with the High- Speed Electrical
Test Tool Kit software.
You can download the High- Speed Electrical Test Tool Kit software
(USBHSET) from the developers tools page at the USB Implementers
Forum web site, http://www.usb.org/developers/tools.
The High- Speed Electrical Test Tool Kit software contains a proprietary
EHCI driver stack. The Hi-speed Electrical Test Tool software requires the
use of a proprietary EHCI driver stack. The use of this proprietary EHCI
driver stack facilitates the electrical testing that requires direct control of
the command registers of the USB EHCI host controllers. The end result
much more robust test bed environment. Since the proprietary EHCI
driver stack is designed for debug and test validation purposes, this driver
stack does not support the normal functionality as found in the EHCI
drivers from Microsoft (or the device vendor). An automatic driver stack
switching function has been implemented into the Hi- speed Electrical Test
Tool for easy switching between the proprietary EHCI driver stack and
that from Microsoft. Upon invocation of the HS Electrical Test Tool
software, the driver stack will automatically switch to the Intel proprietary
EHCI driver stack. Upon exit of the HS Electrical Test Tool software, the
driver stack will automatically switch to the Microsoft EHCI driver stack.
USB self-powered hub (and power supply). These are the hubs used for
compliance testing and are available from the USB-IF. For development
testing, in most cases, a hub that has passed USB compliance testing can
be used.
n/a n/a n/a 5
Table 4 Miscellaneous Cables and Devices (continued)
TESTS
Equipment Required
Host
Hi-Speed
Hub
Hi-Speed
Device
Hi-Speed
Low/Full
Speed
Table 5 High-Speed Electrical Test Bed Computer
TESTS
Equipment Required
Host
Hi-Speed
Hub
Hi-Speed
Device
Hi-Speed
Low/Full
Speed
High-Speed Electrical Test Bed Computer 1111
High-Speed Electrical Test Tool Kit software (USBHSET) 1111