Intel 820E manual Processor Signals

				Intel® 820E Chipset
	R
Table 34. Power Management
		Checklist Items	Recommendations	Reason/Effect
		THRM#	Connect to temperature sensor.	Input to ICH2 cannot float. THRM#
			Pull-up if not used.	polarity bit defaults THRM# to active
				low, so pull-up.
		SLP_S3#	No pull-up/pull-down resistors needed.	Signal driven by ICH2.
		SLP_S5#	Signals driven by ICH2.
		PWROK	This signal should be connected to power	Timing requirement
			monitoring logic, and should go high no
			sooner than 10 ms after both Vcc 3_3 and
			Vcc 1_8 have reached their nominal
			voltages
		PWRBTN#	No extra pull-up resistors	This signal has an integrated pull-up of 9
				kΩ ± 3 kΩ .
		RI#	RI# does not have an internal pull-up. An	If this signal is enabled as a wake event,
			8.2 kΩ pull-up resistor to the resume well is	it is important to keep it powered during
			recommended.	the power loss event. If this signal goes
				low (active), when power returns the
				RI_STS bit will be set and the system
				will interpret that as a wake event.
		RSMRST#	This signal should be connected to power	Timing requirement
			monitoring logic, and it should go high no
			sooner than 10 ms after both VccSus3_3
			and VccSus1_8 have reached their nominal
			voltages. It can be tied to RESUMEPWROK
			on desktop platforms.
Table 35. Processor Signals
		Checklist Items	Recommendations	Reason/Effect
		A20M#, CPUSLP#,	Internal circuitry has been added to the	Push/pull buffers now drive the output
		IGNNE#, INIT#, INTR,	ICH2. External pull-up resistors are not	signals.
		NMI, SMI#, STPCLK#	needed.
		FERR#	Requires a weak external pull-up resistor	For specific values, refer to the
			to VCCCORE.	processor documentation for the
				processor that the platform utilizes.
		RCIN#	Pull-up signals to VCC 3.3 through a 10 kΩ	Typically driven by an open-drain
		A20GATE	resistor	external microcontroller.
		CPUPWRGD	Connect to the processor PWRGOOD	For specific values, refer to the
			input. Requires a weak external pull-up	processor documentation for the
			resistor to VCCCORE.	processor that the platform utilizes.

Design Guide 129