Intel SDS2 manual Chipset Support Components, Super I/O, General Purpose Input and Output Gpio

I/O Subsystem		Intel® Server Board SDS2
Pad	GPIO Name	Description
Y19	N_NVRAMCLR	Input from jumper to be in BIOS Recovery mode in case of corruption
V17	N_PASSDIS_00	Input from jumper to clear password assignments
U16	N_CMOSCLR_00	Input from jumper to clear setup info in CMOS
T20	N_F3SETUPEN_00	Input from jumper to to be in special test mode (manufacturing only)
T19	N_BMC_SCIN	Input from BMC of SCI event
T18	N_BMCISPMD_00	Input from jumper to to be in special test mode (manufacturing only)
U18	N_FRB3STP_00	Output signal to turn off FRB timer to stop fault conditions (this signal is wire-or
		with the 2-pin jumper
Y16	N_SCSI_IDSEL_EN	Output signal to disable onboard SCSI controller
V12	N_LAN2_IDSEL_EN	Output signal to disable onboard NIC2
U12	N_LAN1_IDSEL_EN	Output signal to disable onboard NIC1
V19	CSBPICD0	CSB5 APIC Data Bus 0
W20	CSBPICD1	CSB5 APIC Data Bus 1
Y20	N_ROM_CSN	Output signal for BIOS Chip Select
U19	N_VGA_IDSEL_EN	Output signal to disable onboard Video

4.6Chipset Support Components

4.6.1Super I/O

The National Semiconductor PC87417 Super I/O device contains all of the necessary circuitry to control two serial ports, one parallel port, floppy disk, and PS/2-compatible keyboard and mouse. The SDS2 Server Board supports the following features:

∙GPIO

∙Two serial ports

∙Floppy

∙Keyboard and mouse through PS/2 connectors

∙Parallel port

∙Real-time clock

∙Wake-up control

4.6.1.1General Purpose Input and Output - GPIO

The National Semiconductor* PC87417 Super I/O provides number of general-purpose input/output pins that the SDS2 Server Board utilizes. The following table identifies the pin, the signal name used in the schematic and a brief description of its usage.

		Table 11. Super I/O GPIO Usage Table
Pin #	Signal Name	Description
10	N_BMC_SYSIRQ_00	System Interrupt Controller interrupt from BMC
13	N_SIO_CLK_40M_BMC	40MHz clock output to BMC
18		Revision 1.2
		Order Number: A85874-002