Intel® Server Board SDS2 I/O Subsystem
Revision 1.2
Order Number: A85874-002 19
Pin #
Signal Name Description
35 N_BMC_SWIN
36 N_BMCPWRN Power LED from BMC
37 N_EXTEN_00 External Event
38 N_SUPERSCI_00 System Control Interrupt used to detect wake-up events
45 N_SIO_CLK_RTC_BMC Real Time Clock output to BMC
49 N_P2_PME Power Management Event from PCI Bus (P64-B segment)
50 N_P3_PME Power Management Event from PCI Bus (P64-C segment)
51 N_FP_PWR_LED+00 Power LED indicator to Front Panel
52 N_LAN_PME Power Management Event from PCI Bus (P32-A segment)
53 N_BMC_SCIN System Management Interrupt from BMC
125 KBCLKL Keyboard Clock
126 KBDATL Keyboard Data
127 MSCLKL Mouse Clock
128 MSDATL Mouse Data
4.6.1.2 Serial Ports
Two serial ports are provided on the Server Board, a 9-pin DB9 connector is located on the rear
I/O to supply COM1 and a 10-pin header on the Server Board provides COM2.
4.6.1.3 Floppy
The FDC in the SIO is functionally compatible with floppy disk controllers in the DP8473 and
N844077. All the FDC functions are integrated into the SIO including analog data separator and
16-byte FIFO.
4.6.1.4 Keyboard and Mouse
Two PS/2 ports are provided for keyboard and mouse and are mounted within a single stacked
housing. The mouse connector is stacked over the keyboard connector.
4.6.1.5 Parallel Port
The parallel port is supported on the Server Board through the rear I/O.
4.6.1.6 Real-time Clock
The SIO contains a real-time clock with external battery backup. The device also contains 242
bytes of general purpose battery-backed CMOS RAM.
4.6.1.7 Wake-up Control
The SIO contains functionality that allows various events to control the power-on and power-off
of the system.