Gunning transceiver logic
Template:Moreinline Gunning transceiver logic (GTL) is a type of logic signaling used to drive electronic backplane buses. It has a voltage swing between 0.4 volts and 1.2 volts — much lower than that used in TTL and CMOS logic — and symmetrical parallel resistive termination. The maximum signaling frequency is specified to be 100 MHz, although some applications use higher frequencies. GTL is defined by JEDEC standard JESD 8-3 (1993) and was invented by William Gunning while working for Xerox at the Palo Alto Research Center.
All Intel front-side buses use GTL. As of 2008, GTL in these FSBs has a maximum frequency of 1.6 GHz.[1] The front-side bus of the Intel Pentium Pro, Pentium II and Pentium III microprocessors uses GTL+ (or GTLP) developed by Fairchild Semiconductor, an upgraded version of GTL which has defined slew rates and higher voltage levels. AGTL+ stands for either assisted Gunning transceiver logic or advanced Gunning transceiver logic. These are GTL signaling derivatives used by Intel microprocessors.
References
- ↑ Shimpi, Anand Lal (2008), Intel's Atom Architecture, http://www.anandtech.com/showdoc.aspx?i=3276&p=15
- "GTLP vs. GTL: A Performance Comparison from a System Perspective", AN-1070 (Fairchild Semiconductor), December 2000, http://www.fairchildsemi.com/an/AN/AN-1070.pdf, retrieved 2008-03-18
- "GTL/BTL: A Low-Swing Solution for High-Speed Digital Logic", Application Note (Texas Instruments), 1997, http://focus.ti.com/lit/an/scea003a/scea003a.pdf
- JEDEC Standard JESD8-3A, Gunning Transceiver Logic (GTL) Low-Level, High Speed Interface Standard for Digital Integrated Circuits, JEDEC, May 2007, http://www.jedec.org/sites/default/files/docs/JESD8-3A.pdf
- Steve Blozis (January 2001), Texas Instruments GTLP Frequently Asked Questions, Texas Instruments, https://www.ti.com/lit/ab/scea019/scea019.pdf
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