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22 SKA4 Baseboard Product Guide
IDE Controller
IDE is a 16-bit interface for intelligent disk drives with AT
†
disk controller electronics onboard.
The Open South Bridge (OSB4) acts as a PCI-based fast IDE controller. The device controls:
• PIO and IDE DMA/bus master operations
• Mode 4 timings
• Transfer rates up to 33 MB/sec
• Ultra DMA 33 capacity
• Buffering for PCI/IDE burst transfers
• Master/slave IDE mode
• Up to two drives for one IDE channel
✏
NOTE
18-inch maximum length of IDE cable: An IDE signal cable can be
connected up to the IDE connector on the baseboard. However, the
maximum length of the cable is 18 inches. The cable supports up to two
devices, one at the end of the cable and the other six inches from the end.
Keyboard and Mouse
The PS/2-compatible keyboard and mouse connectors are mounted in a single-stacked housing
with the mouse connector over the keyboard. External to the system, they appear as two
connectors.
The user can plug in the keyboard and mouse to either connector before powering up the system.
BIOS detects these and configures the keyboard controller accordingly.
The keyboard controller is functionally compatible with the Intel
®
8042A microcontroller. The
system can be locked automatically if no keyboard or mouse activity occurs for a predefined length
of time, if specified through the SSU. Once the inactivity (lockout) timer has expired, the
keyboard and mouse do not respond until the previously stored password is entered.