Intel 317443-001US Glossary of Terms and Acronyms, Aggressor, Anti-etch, Bus Agent, Crosstalk

About This Manual—Intel®945GME Express Chipset

1.3Glossary of Terms and Acronyms

This section defines conventions and terminology used throughout this document.

Aggressor	A network that transmits a coupled signal to another network.
Anti-etch	Any plane-split, void or cutout in a VCC or GND plane.

Assisted Gunning Transceiver Logic+

The front-side bus uses a bus technology called AGTL+, or Assisted Gunning Transceiver Logic. AGTL+ buffers are open- drain, and require pull-up resistors to provide the high logic level and termination. AGTL+ output buffers differ from GTL+ buffers with the addition of an active pMOS pull-up transistor to assist the pull-up resistors during the first clock of a low-to-high voltage transition.

Asynchronous GTL+ The processor does not utilize CMOS voltage levels on any signals that connect to the processor. As a result, legacy input signals such as A20M#, IGNNE#, INIT#, LINT0/INTR, LINT1/ NMI, PWRGOOD, SMI#, SLP#, and STPCLK# utilize GTL+ input buffers. Legacy output signals (FERR# and IERR#) and non- AGTL+ signals (THERMTRIP# and PROCHOT#) also utilize GTL+ output buffers. All of these signals follow the same DC requirements as AGTL+ signals, however the outputs are not actively driven high (during a logical 0 to 1 transition) by the processor (the major difference between GTL+ and AGTL+). These signals do not have setup or hold time specifications in relation to BCLK[1:0], and are therefore referred to as “Asynchronous GTL+ Signals”. However, all of the Asynchronous GTL+ signals are required to be asserted for at least two BCLKs in order for the processor to recognize them.

Bus Agent	A component or group of components that, when combined,
	represent a single load on the AGTL+ bus.
Crosstalk	The reception on a victim network of a signal imposed by
	aggressor network(s) through inductive and capacitive coupling
	between the networks.
	•	Backward Crosstalk - Coupling that creates a signal in a
		victim network that travels in the opposite direction as the
		aggressor’s signal.
	•	Forward Crosstalk - Coupling that creates a signal in a
		victim network that travels in the same direction as the
		aggressor’s signal.
	•	Even Mode Crosstalk - Coupling from a signal or multiple
		aggressors when all the aggressors switch in the same
		direction that the victim is switching.
	•	Odd Mode Crosstalk - Coupling from a signal or multiple
		aggressors when all the aggressors switch in the opposite
		direction that the victim is switching.
Flight Time	Flight time is a term in the timing equation that includes the
	signal propagation delay, any effects the system has on the TCO
	of the driver, plus any adjustments to the signal at the receiver

	Intel® CoreTM 2 Duo processor with the Mobile Intel® 945GME Express Chipset
May 2007	Manual
Order Number: 317443-001US	9