1.

General description

The GTL2008/GTL2107 is a customized translator between dual Xeon processors,

Platform Health Management, South Bridge and Power Supply LVTTL and GTL signals.

Functionally and footprint identical to the GTL2007, the GTL2008/GTL2107 LVTTL and

GTL outputs were changed to put them into a high-impedance state when EN1 and EN2

are LOW, with the exception of 11BO because its normal state is LOW, so it is forced

valid states and VREF is at its proper voltage to assure that the outputs will remain

high-impedance through power-up.

Both the GTL2008/GTL2107 and the GTL2007 are derived from the GTL2006. They add

an enable function that disables the error output to the monitoring agent for platforms that

monitor the individual error conditions from each processor. This enable function can be

used so that false error conditions are not passed to the monitoring agent when the

system is unexpectedly powered down. This unexpected power-down could be from a

power supply overload, a CPU thermal trip, or some other event of which the monitoring

agent is unaware.

A typical implementation would be to connect each enable line to the system power good

signal or the individual enables to the VRD power good for each processor.

of 0.66 V. Characterization results show that there is little DC or AC performance variation

between these levels.

The GTL2008 is the companion chip to the GTL2009 3-bit GTL Front-Side Bus frequency

comparator that is used in dual-processor Xeon applications.

The GTL2107 is the Intel designation for the GTL2008.

2.

Features

LOW

GTL2008; GTL2107

12-bit GTL to LVTTL translator with power good control and

high-impedance LVTTL and GTL outputs

Rev. 02 — 26 September 2006

Product data sheet