Chapter 1
Motherboard Description
1-11
the processor, which immediately goes into System Management Mode
(SMM).While the computer is in sleep mode it is fully capable of
responding to and servicing external interrupts (such as an incoming fax)
even though the monitor turns on only if a keyboard or mouse interrupt
occurs. To reactivate or resume the system, the SMI switch must be
pressed again, or the keyboard or mouse must be used.
Power On Button
(Use ATX Power)
This connector can be connected to a front panel power switch. The switch must
pull the Power Button pin to ground for at least 50 ms to signal the power supply
to switch on or off. (The time requirement is due to internal debounce circuitry on
the motherboard.) At least two seconds must pass before the power supply will
recognize another on/off signal.
1.3.2 Hard Disk Connectors (IDE1/ IDE2)
The motherboard has a 32-bit Enhanced PCI IDE Controller that provides PIO
Mode 0~4, Bus Master, and Ultra DMA 33 / 66 functionality. It has two HDD
connectors IDE1 (primary) and IDE2 (secondary). You can connect up to four
hard disk drives, a CD-ROM, a 120MB Floppy (reserved for future BIOS) and
other devices to IDE1 and IDE2. These connectors support the IDE hard disk
cable provided.
•
IDE1 (Primary IDE Connector)
The first hard drive should always be connected to IDE1. IDE1 can connect a
Master and a Slave drive. You must configure the second hard drive on IDE1 to
Slave mode by setting the jumper accordingly.
•
IDE2 (Secondary IDE Connector)
The IDE2 controller can also support a Master and a Slave drive. The
configuration is similar to IDE1. The second drive on this controller must be set
to slave mode.
1.3.3 Floppy Disk Connector (FDD1)
The motherboard provides a standard floppy disk connector (FDC) that supports
360K, 720K, 1.2M, 1.44M and 2.88M floppy disk types. This connector
supports the provided floppy drive ribbon cables.
