Connect-Tek USB-2 Manuel d'utilisateur télécharger pdf (Page 6)

Application Note

www.tektronix.com/usb6

Test Equipment

The receiver sensitivity test requires a real-time oscilloscope,

such as a MSO/DPO5204 or DPO7254 or higher bandwidth

model, and a highspeed data source that can transmit IN

tokens of varying amplitude, such as a Tektronix AWG5000

or AWG7000C Series Arbitrary Waveform Generator. This test

also requires differential probes, like a TDP1500, TDP3500, or

P6248

, and test software and a test ﬁxture.

Figure 5 shows the set-up to perform this test using an

oscilloscope and data generator. The option USB test

package provides various test set-ups and the test patterns

for the signal source, needed for receiver sensitivity testing.

CHIRP Test

The CHIRP test examines the basic timing and voltages of

both upstream and downstream ports during the speed

detection protocol. For a hub, the CHIRP test must be

performed on both upstream and downstream ports.

To perform CHIRP testing, the DUT is hot-plugged and

signaling is measured with single-ended probes on both

data lines. Data is analyzed for CHIRP K amplitude, CHIRP

K duration, Reset duration, Number of KJ pairs before High

Speed termination and delay after KJKJKJ before device-

applied termination.

Figure 6 illustrates the CHIRP test using a DPO7254.

Test Equipment

The CHIRP test requires a 2 GHz or higher bandwidth realtime

oscilloscope, such as a MSO/DPO5204 or DPO7254, with

single-ended probes, like a TAP1500, TAP2500, TAP3500,

P6243

or P6245

. In addition, this test requires test software

and a test ﬁxture, such as the option USB compliance test

package.

Manual analysis of the various CHIRP types and conditions is

a time-consuming process. The test package automates this

process and automatically documents the results.

Test Mode

SMA

Oscilloscope

Data Generator

USB 2.0 Test Fixture

HS Device

Figure 5. Set-up for a receiver sensitivity test using a DPO7254 and a

Tektronix signal source.

Figure 6. Test parameters for a CHIRP test.

Requires a TPA-BNC adapter when used on an MSO/DPO5000 or DPO7000 Series model.

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

Commentaires sur ces manuels

Pas de commentaire

Connect-Tek USB-2 Manuel d'utilisateur Page 6

Commentaires sur ces manuels

Produits connexes et manuels pour Commutateurs de réseau Connect-Tek USB-2