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I/O Subsystem Intel® Server Board SDS2
Revision 1.2
Order Number: A85874-002
18
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
4.6 Chipset Support Components
4.6.1 Super 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
4.6.1.1 General 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