GD82551IT Intel, GD82551IT Datasheet - Page 77

• Manufacturer Part Number: GD82551IT
• Manufacturer: Intel

Specifications of GD82551IT

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 196
• Lead Free Status / RoHS Status: Not Compliant

10.0
10.1
10.2
10.2.1
Datasheet
82551IT Test Port Functionality
Introduction
The 82551IT’s XOR Tree Test Access Port (TAP) is the access point for test data to and from the
device. The port provides the ability to perform basic production level testing.
Test Function Description
The 82551IT TAP mode supports two tests that can be used in board level design. These tests help
verify basic functionality as well as test the integrity of solder connection on the board. The tests
are described in the following subsections.
Tristate
The tristate command sets all 82551IT input and output pins into a tristate (high-Z) mode (all
internal pull-ups and pull-downs are disabled). This mode is entered by setting the following test
pin combination and resetting the device:
TEST = 1
TCK = 0
TEXEC = 0
TI = 1
Networking Silicon — 82551IT
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