Technical data

Agilent Technologies

141

N5416A USB 2.0 Compliance Test Option

Notes on Electrical Testing

Host Hi-Speed Electrical Tests

Host Hi-Speed Signal Quality 143

Host Controller Packet Parameters 148

Host Disconnect Detect 155

Host CHIRP Timing 159

Host Suspend/Resume Timing 164

Host Test J/K, SE0_NAK 169

In addition to the hi- speed electrical tests prescribed in this chapter, the

host controller under test must also pass the following electrical

compliance tests applicable to the EHCI Host Controller:

• Full speed signal quality.

• Low speed signal quality.

• Drop/Droop.

Before Running These Tests

If you haven’t already performed the initial equipment set up, see “Setting

Up the Equipment" on page 25.

NOTE

To give the automated test software more flexibility in making corner case measurements

(and improve test performance), the oscilloscope’s memory upgrade option is

recommended (Option 001 when ordered with the oscilloscope, or after purchase: E2680A

for the 5485xA Series oscilloscopes, or N5404A for the 80000 and 90000A Series

oscilloscopes).

Also, to reduce the bandwidth of the oscilloscope to just what is required by the USB-IF

(2 GHz for USB 2.0)—this can greatly reduce system measurement noise, allowing the

maximum measurement margin—the enhanced bandwidth software option is

recommended for the Agilent 54855A oscilloscope (Option 008), and the noise reduction

software option is recommended for the 80000 and 90000A Series oscilloscopes (Option

005 when ordered with the oscilloscope or N5403A after purchase).