Terminology; Conventions And Terminology - Intel Pentium M Processor Design Manual

1.2

Terminology

This section defines terminology used throughout the design guide.
Table 2. Conventions and Terminology (Sheet 1 of 4)
Terminology
Aggressor
AGTL+
Asynchronous GTL+
Bus Agent
Core Power
Crosstalk
Derived Power
Uni-Processor (UP)
Electromagnetic
Compatibility (EMC)
Electromagnetic
Interference (EMI)
Design Guide
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Intel Pentium M Processor and Intel
A network that transmits a coupled signal to another network.
The processor system bus uses a bus technology called Assisted Gunning
Transceiver Logic (AGTL+). 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.
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. All of the Asynchronous GTL+ signals must 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 system bus.
Core power refers to a power rail that is on only during full-power operation.
These power rails are on when the active-low PSON signal is asserted to the
power supply. The core power rails that are distributed directly from the power
supply are: +12 V, +5 V, and +3.3 V.
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.
A derived power rail is any power rail that is generated from another power rail
using an on-board voltage regulator. For example, +2.5 V is derived from a +5 V
power rail using a voltage regulator.
Used to specify a system configuration using one processor.
The successful operation of electronic equipment in its intended electromagnetic
environment.
Electromagnetic radiation from an electrical source that exceeds the federally
regulated limits.
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