Mobile Intel
®
915GME Express Chipset
April 2007
Development Kit User’s Manual
Order Number: 317230-001US
11
About This Manual—Mobile Intel
®
915GME Express Chipset
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.
SSO
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 agent pad to the other end agent pad.
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.
VRD 10.0
The Voltage Regulator Module (a down on the board solution)
specification for the Intel
®
Pentium
®
4 Processor with HT
Technology processor. It is a DC-DC converter module that
supplies the required voltage and current to a single processor.
Table 1
defines the acronyms used throughout this document.
Table 1.
Acronyms (Sheet 1 of 2)
Acronym
Definition
AC
Audio Codec
ASF
Alert Standard Format
AMC
Audio/Modem Codec.
Anti-Etch
Any plane-split, void or cutout in a VCC or GND plane is referred to as an anti-etch
CMC
Common Mode Choke
CNR
Communications and Networking Riser
EMI
Electro Magnetic Interference
ESD
Electrostatic Discharge
FS
Full-speed. Refers to USB
HS
High-speed. Refers to USB
ICH
I/O Controller Hub
LOM
LAN on Motherboard
LPC
Low Pin Count
