Intel 810A3 Design Manual page 17

Term
Overdrive Region
Overshoot
Pad
Pin
Power rails
Ringback
Settling Limit
Setup Window
Simultaneous
Switching Output
(SSO) Effects
Standby power rail
Stub
Suspend operation
®
Intel 810A3 Chipset Design Guide
Definition
Is the voltage range, at a receiver, located above and below V
signal integrity analysis. See the Pentium
Manual for more details.
Maximum voltage allowed for a signal at the processor core pad. See
each process's Electrical, Mechanical, and Thermal Specification for
overshoot specification.
A feature of a semiconductor die contained within an internal logic
package on the S.E.C cartridge substrate used to connect the die to the
package bond wires. A pad is only observable in simulation.
A feature of a logic package contained within the S.E.C. cartridge used
to connect the package to an internal substrate trace.
An ATX power supply has 6 power rails: +5V, -5V, +12V, -12V,
+3.3V, +5VSB. In addition to these power rails, several other power
rails can be created with voltage regulators.
Ringback is the voltage that a signal rings back to after achieving its
maximum absolute value. Ringback may be due to reflections, driver
oscillations, etc. See the respective Processor's Electrical, Mechanical,
and Thermal Specification for ringback specification.
Defines the maximum amount of ringing at the receiving pin that a
signal must reach before its next transition. See the respective
Processor's Electrical, Mechanical, and Thermal Specification for
settling limit specification.
Is the time between the beginning of Setup to Clock (T
arrival of a valid clock edge. This window may be different for each
type of bus agent in the system.
Refers to the difference in electrical timing parameters and degradation
in signal quality caused by multiple signal outputs simultaneously
switching voltage levels (e.g., high-to-low) in the opposite direction
from a single signal (e.g., low-to-high) or in the same direction (e.g.,
high-to-low). These are respectively called odd-mode switching and
even-mode switching. This simultaneous switching of multiple outputs
creates higher current swings that may cause additional propagation
delay (or "pushout"), or a decrease in propagation delay (or "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.
A power rail that in on during suspend operation (these rails are also on
during full-power operation). These rails are on at all times (when the
power supply is plugged into AC power). The only standby power rail
that is distributed directly from the ATX power supply is 5VSB (5V
Standby). There can be other standby rails that are created with voltage
regulators.
The branch from the trunk terminating at the pad of an agent.
During suspend operation, power is removed from some components on
the motherboard. The customer reference board supports three suspend
states: processor Stop Grant (S1), Suspend-to-RAM (S3) and Soft-off
(S5).
Introduction
for
REF
II Processor Developer's
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1-5