Gunning Transceiver Logic

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

"GTLP vs. GTL: A Performance Comparison from a System Perspective" (PDF), AN-1070, Fairchild Semiconductor, December 2000, archived from the original (PDF) on 2013-09-22, retrieved 2008-03-18
"GTL/BTL: A Low-Swing Solution for High-Speed Digital Logic" (PDF), Application Note, Texas Instruments, 1997
JEDEC Standard JESD8-3A, Gunning Transceiver Logic (GTL) Low-Level, High Speed Interface Standard for Digital Integrated Circuits (PDF), JEDEC, May 2007

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[1] Shimpi, Anand Lal (2008), Intel's Atom Architecture

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v t e Logic families
MOS technology	PMOS logic NMOS logic Depletion-load NMOS logic (including HMOS) Complementary MOS (CMOS) Pass transistor logic (PTL) Bipolar–CMOS (BiCMOS)
Other technologies	Diode logic Diode–transistor logic (DTL) Open collector (OC) Direct-coupled transistor logic (DCTL) Emitter-coupled logic (ECL) Gunning transceiver logic (GTL) Integrated injection logic (I²L) Resistor–transistor logic (RTL) Transistor–transistor logic (TTL) Current mode logic / Source-coupled logic (CML/SCL)
Types	Static Dynamic Domino logic Four-phase logic