Glossary Of Terms And Acronyms - Intel Core Duo Mobile 945GM User Manual

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Glossary of Terms and Acronyms

This section defines conventions and terminology used throughout this document.
Aggressor
Anti-etch
Assited Gunning Xcvr Logic+
Asynchronous GTL+
Bus Agent
Crosstalk
Flight Time
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A network that transmits a coupled signal to another network.
Any plane-split, void or cutout in a VCC or GND plane.
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.
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.
A component or group of components that, when combined, represent a
single load on the AGTL+ bus.
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 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 needed to ensure the
setup time of the receiver. More precisely, flight time is defined as:
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