vsc880 Vitesse Semiconductor Corp, vsc880 Datasheet - Page 12

• Manufacturer Part Number: vsc880
• Description: High Performance 16x16 Serial Crosspoint Switch Semiconductor Corporation
• Manufacturer: Vitesse Semiconductor Corp

High Performance 16x16
Serial Crosspoint Switch
Page 12
BSTPASS HIGH if the test was successful. The functional timing diagram above shows a typical test sequence.
The PRBS pattern generator can also be tested by itself by setting the control register bit BIST HIGH. This
loops the output of the pattern generator directly back to the comparator circuit. This test will be typically run
before running the tests described above. In this case, the signals BSTEN, BSTRST and BSTPASS will operate
as shown in the Figure 5 above.
The signal BSTRST is used to reset the PRBS pattern, and there is a comparator that sets the signal
The BIST test can be run on no more than two ports at a time, for example: port 0
ADDR[4:0]
BSTPASS
BSTRST
REFCLK
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]
Figure 5: Built-in Self-Test Functional Timing
VITESSE
SEMICONDUCTOR CORPORATION
< 10 S
Internet: www.vitesse.com
port 3
port 8
Data Sheet
VSC880
port 0.
G52191-0, Rev 4.2
01/05/01