GPIO Map

Current GPIO Map

This map details the usage of each GPIO pin on the 5536. (Last updated March 8, 2007): If blank, B1 and A are the same as B2.

PIN	B2 Usage	B1	A	Input	Output	Notes	OUTPUT_ENABLE	OUT_AUX1	OUT_AUX2	INPUT_ENABLE	IN_AUX1	INPUT_EVENT_ENABLE
0	PCI_INTA#			X		PCI Interrupt				X		X
1	MIC_AC#/DC	PCSPK	PCSPK		X	Controls the AC/DC input on the microphone	X
2	GPIO2		IRQ15	X		Reads memory strap				X
3	VGA SCL			-	-	EDID line - not needed for XO machine
4	VGA SDA			-	-	EDID line - not needed for XO machine
5	DCONSTAT0			X		DCON status pin (1 of 2)				X
6	DCONSTAT1		DCONMODE>	X		DCON status pin (2 of 2)				X
7	DCONIRQ#		PCI_INTB#	X		DCON Interrupt PIN				X		X
8	UART1_TX				X	UART Transmit	X	X
9	UART1_RX			X		UART Receive				X	X
10	THERM_ALARM		N/C	X		Thermal Alarm input				X	X
11	DCONLOAD		P/U		X	Output indicator for DCON	X
12	DCONBLNK			X		DCON Signal				X
13	SMI#				X	SMI# pin to the GX	X
14	SMB_CLK			X	X	SMBus clock	X	X		X	X
15	SMB_DATA			X	X	SMBus data	X	X		X	X
16	LPC_AD0			-	-	Defaults to LPC - no GPIO control
17	LPC_AD1			-	-	Defaults to LPC - no GPIO control
18	LPC_AD2			-	-	Defaults to LPC - no GPIO control
19	LPC_AD3			-	-	Defaults to LPC - no GPIO control
20	LPC_DRQ_L			-	-	Defaults to LPC - no GPIO control
21	LPC_SERIRQ			-	-	Defaults to LPC - no GPIO control
22	LPC_FRAME_L			-	-	Defaults to LPC - no GPIO control
24	WORK_AUX				X	Controls MAIN_ON (which controls VCORE_CPU)	X	X
25	SWI#			X		Unknown - line comes from GPIO2 on the EC
26	PWR_BUT_in		N/C	X		Lid event				X		X
27	SCI#			X		SCI from the EC for power and battery events				X		X
28	PWR_BUT#			X		Power button input				X	X

Changes

Jan 15, 2007 (B2)

• GPIO1 changes from AC_BEEP to MIC_AC#/DC output
• GPIO10 changes from unused to THRM_ALARM input
• GPIO26 changes from unused to PWR_BUT_in input