Intel 317443-001US - Manual (Page 11)

Intel ® Core TM 2 Duo processor with the Mobile Intel ® 945GME Express Chipset
May 2007 Manual
Order Number: 317443-001US 11
About This Manual—Intel ® 945GME Express Chipset
Power-Good “Power-Good,” “PWRGOOD,” or “CPUPWRGOOD” (an active high
signal) indicates that all of the system power supplies and clocks
are stable. PWRGOOD should go active a predetermined time
after system voltages are stable and should go inactive as soon
as any of these voltages fail their specifications.
Ringback The voltage to which a signal changes after reaching its
maximum absolute value. Ringback may be caused by
reflections, driver oscillations, or other transmission line
phenomena.
System Bus The System Bus is the microprocessor bus of the processor.
Setup Window The time between the beginning of Setup to Clock (TSU_MIN)
and the arrival of a valid clock edge. This window may be
different for each type of bus agent in the system.
Simultaneous Switching Output
Simultaneous Switching Output (SSO) effects are differences in
electrical timing parameters and degradation in signal quality
caused by multiple signal outputs simultaneously switching
voltage levels in the opposite direction from a single signal or in
the same direction. These are called odd mode and even mode
switching, respectively. This simultaneous switching of multiple
outputs creates higher current swings that may cause additional
propagation delay (“push-out”) or a decrease in propagation
delay (“pull-in”). These SSO effects may impact the setup and/
or hold times and are not always taken into account by
simulations. System timing budgets should include margin for
SSO effects.
Stub The branch from the bus trunk terminating at the pad of an
agent.
Trunk The main connection, excluding interconnect branches, from
one end
System Management Bus
A two-wire interface through which various system components
may communicate.
Undershoot The minimum voltage extending below VSS observed for a
signal at the device pad.
V
CC
(CPU core) V
CC
(CPU core) is the core power for the processor. The system
bus is terminated to V
CC
(CPU core).
Victim A network that receives a coupled crosstalk signal from another
network is called the victim network.
Table 1 defines the acronyms used throughout this document.
Table 1. Acronyms (Sheet 1 of 3)
Acronym Definition
AC Audio Codec
ACPI Advanced Configuration and Power Interface
AGTL Assisted Gunning Transceiver Logic
AMC Audio/Modem Codec.
ASF Alert Standard Format
AMI American Megatrends Inc. (BIOS developer)