GTL2009PW,118

GTL2009PW,118 2. Features

GTL2009PW,118 1. General description

The GTL2009 is designed for the Nocona and Dempsey/Blackford dual Intel Xeonprocessor platforms to compare the Front-Side Bus (FSB) frequency settings and set thecommon FSB frequency at the lowest setting if both processor slots are occupied or theFSB setting of the occupied processor slot if only one processor is being used. A defaultFSB frequency of 100 MHz is initially set upon power-up when VDD is greater than 1.5 V.Magnitude comparisons and frequency multiplexing to compute the common FSBfrequency occurs when the two 3-bit FSB GTL inputs from the chip sets are valid. Thecommon FSB frequency GTL outputs switch from the default frequency to the computedfrequency when the GTL reference voltage input (VREF) crosses a static 0.6 V internallygenerated input comparator reference voltage. The GTL2009 then continually monitorsthe FSB frequency and slot occupied inputs for any further changes.The Nocona and Dempsey/Blackford Xeon processors specify a VTT of 1.2 V and 1.1 V,as well as a nominal Vref of 0.76 V and 0.73 V respectively. To allow for future voltage levelchanges that may extend Vref to 0.63 of VTT (minimum of 0.693 V with VTT of 1.1 V) theGTL2009 allows a minimum Vref of 0.66 V. Characterization results show that there is littleDC or AC performance variation between these levels.The GTL2009 is a companion chip to the GTL2006 platform health managementGTL-to-LVTTL translator and the newer GTL2007 that adds an enable function thatdisables the error output to the monitoring agent for platforms that monitor the individualerror conditions from each processor.n Compares FSB frequency inputs to set the lowest frequency as the common busfrequency.n Operates at a range of GTL signal levelsn 3.0 V to 3.6 V operationn LVTTL I/O are not 5 V tolerantn Companion chip to GTL2006 and GTL2007n ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM perJESD22-A115 and 1000 V CDM per JESD22-C101n Latch-up testing is done to JEDEC Standard JESD78, which exceeds 500 mAn Available in TSSOP16 package

GTL2009PW,118 6.2 Pin description