JG82845 S L8D8 Intel, JG82845 S L8D8 Datasheet - Page 137
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JG82845 S L8D8
Manufacturer Part Number
JG82845 S L8D8
Description
Manufacturer
Intel
Datasheet
1.JG82845_S_L8D8.pdf
(148 pages)
Specifications of JG82845 S L8D8
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8
8.1
Intel
Figure 10. XOR Tree Chain
®
82845 MCH for SDR Datasheet
R
Testability
In the MCH, testability for Automated Test Equipment (ATE) board-level testing has been
implemented as an XOR chain. An XOR-tree is a chain of XOR gates, each with one input pin
connected to it (see Figure 10).
The algorithm used for in-circuit test is as follows:
XOR Test Mode Initialization
XOR test mode can be entered by pulling three shared pins (reset straps) low through the rising
transition of RSTIN#. The signals that need to be pulled are as follows:
VCC1_8
Drive all input pins to an initial logic level 1. Observe the output corresponding to scan chain
being tested.
Toggle pins one at a time (starting from the first pin in the chain and continuing to the last
pin) from its initial logic level to the opposite logic level. Observe the output changes with
each pin toggle.
G_GNT# = 0 (Global strap enable)
SBA1 = 0 (XOR strap)
ST2 = 0 (PLL Bypass mode; it is recommended to enter PLL Bypass in XOR test mode)
Input
Input
Input
Input
Input
Testability
xor.vsd
XOR
Out
137
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