Specifications

Intel
®
810E2 Chipset Platform
R
Design Guide 15
Term Definition
Crosstalk 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 multiple aggressors when all the aggressors
switch in the same direction that the victim is switching.
• Odd Mode Crosstalk - coupling from multiple aggressors when all the aggressors
switch in the opposite direction that the victim is switching.
Edge Finger The cartridge electrical contact that interfaces to the SC242 connector.
Flight Time Flight Time is a term in the timing equation that includes the signal propagation delay,
any effects the system has on the T
CO
of the driver, plus any adjustments to the signal
at the receiver needed to guarantee the setup time of the receiver.
More precisely, flight time is defined to be:
The time difference between a signal at the input pin of a receiving agent crossing
V
REF
(adjusted to meet the receiver manufacturer’s conditions required for AC timing
specifications; i.e., ringback, etc.), and the output pin of the driving agent crossing
V
REF
if the driver was driving the Test Load used to specify the driver’s AC timings.
See Section 4.1 for details regarding flight time simulation and validation.
The V
REF
Guardband takes into account sources of noise that may affect the way an
AGTL+ signal becomes valid at the receiver. See the definition of the V
REF
Guardband.
• Maximum and Minimum Flight Time - Flight time variations can be caused by many
different parameters. The more obvious causes include variation of the board
dielectric constant, changes in load condition, crosstalk, V
TT
noise, V
REF
noise,
variation in termination resistance and differences in I/O buffer performance as a
function of temperature, voltage and manufacturing process. Some less obvious
causes include effects of Simultaneous Switching Output (SSO) and packaging
effects.
 The Maximum Flight Time is the largest flight time a network will experience
under all variations of conditions. Maximum flight time is measured at the
appropriate V
REF
Guardband boundary.
 The Minimum Flight Time is the smallest flight time a network will experience
under all variations of conditions. Minimum flight time is measured at the
appropriate V
REF
Guardband boundary.
For more information on flight time and the V
REF
Guardband, see the Intel
®
Pentium
®
II
Processor Developer’s Manual.
GTL+ GTL+ is the bus technology used by the Pentium Pro processor. This is an incident
wave switching, open-drain bus with pull-up resistors that provide both the high logic
level and termination. It is an enhancement to the GTL (Gunning Transceiver Logic)
technology. See the Intel
®
Pentium
®
II Processor Developer’s Manual for more details
of GTL+.
Network The trace of a Printed Circuit Board (PCB) that completes an electrical connection
between two or more components.
Network Length The distance between extreme bus agents on the network and does not include the
distance connecting the end bus agents to the termination resistors.
Overdrive Region Is the voltage range, at a receiver, located above and below V
REF
for signal integrity
analysis. See the Intel
®
Pentium
®
II Processor Developer’s Manual for more details.
Overshoot Maximum voltage allowed for a signal at the processor core pad. See each processor’s
datasheet for overshoot specification.