GTL2007

The GTL2007 is a customized translator between dual Xeon processors, Platform Health Management, South Bridge and Power Supply LVTTL and GTL signals.

The GTL2007 is derived from the GTL2006 with an enable function added 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.

The Nocona and Dempsey/Blackford Xeon processors specify a V_TT of 1.2 V and 1.1 V, as well as a nominal V_ref of 0.76 V and 0.73 V respectively. To allow for future voltage level changes that may extend V_ref to 0.63 of V_TT (minimum of 0.693 V with V_TT of 1.1 V) the GTL2009 allows a minimum V_ref of 0.66 V. Characterization results show that there is little DC or AC performance variation between these levels.

The GTL2007 is the companion chip to the GTL2009 3-bit GTL Front-Side Bus frequency comparator that is used in dual-processor Xeon applications.