Intel 915GME user manual Isi

			Mobile Intel® 915GME Express Chipset —About This Manual
		needed to ensure the setup time of the receiver. More precisely,
		flight time is defined as:
		•	The time difference between a signal at the input pin of a
			receiving agent crossing the switching voltage (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 the switching voltage
			when the driver is driving a test load used to specify the
			driver’s AC timings.
		•	Maximum and Minimum Flight Time - Flight time variations
			are caused by many different parameters. The more
			obvious causes include variation of the board dielectric
			constant, changes in load condition, crosstalk, power 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.
		•	Maximum flight time is the largest acceptable flight time a
			network will experience under all conditions.
		•	Minimum flight time is the smallest acceptable flight time a
			network will experience under all conditions.
	IrDA	IrDA is an acronym for Infrared Data Association, and this
		association has outlined a specification for serial communication
		between two devices via a bi-directional infrared data port. The
		915GM platform has such a port and it is located on the rear of
		the platform between the two USB connectors.
	ISI	Inter-symbol interference is the effect of a previous signal (or
		transition) on the interconnect delay. For example, when a
		signal is transmitted down a line and the reflections due to the
		transition have not completely dissipated, the following data
		transition launched onto the bus is affected. ISI is dependent
		upon frequency, time delay of the line, and the reflection
		coefficient at the driver and receiver. ISI may impact both timing
		and signal integrity.
	Network	The network is the trace of a Printed Circuit Board (PCB) that
		completes an electrical connection between two or more
		components.
	Overshoot	The maximum voltage observed for a signal at the device pad,
		measured with respect to VCC.
	Pad	The electrical contact point of a semiconductor die to the
		package substrate. A pad is only observable in simulations.
	Pin	The contact point of a component package to the traces on a
		substrate, such as the motherboard. Signal quality and timings
		may be measured at the pin.
	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.
Mobile Intel® 915GME Express Chipset
Development Kit User’s Manual			April 2007
10			Order Number: 317230-001US