Ultra I/O Interface Controller (Smc Fdc37C93Fr); Floppy Controller; Keyboard And Mouse Interface; Real Time Clock, Cmos Ram And Battery - Intel TE430VX Technical Product Specification

1.7 Ultra I/O Interface Controller (SMC FDC37C93FR)

1.7.1

Floppy controller

The SMC FDC37C93FR is software compatible with the DP8473 and 82077 floppy disk
controllers. The floppy interface can be configured for 360 KB or 1.2 MB 5¼" media or for
720 KB, 1.2 MB, 1.44 MB, or 2.88 MB 3½" media in the BIOS setup. By default, the Floppy A
interface is configured for 1.44 MB and Floppy B is disabled. Another setup option prevents the
user from being able to write to floppy. Configuring the floppy interface for 1.25 MB 3 ½"
(3-mode floppy) requires the use of special floppy drives and a driver to for the specific operating
system.
1.7.2

Keyboard and mouse interface

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PS/2 keyboard/mouse connectors are located on the back panel side of the motherboard. The 5V
lines to these connectors are protected with a PolySwitch
healing fuse, re-establishing the connection after an over-current condition is removed. While this
device eliminates the possibility of having to replace a fuse, care should be taken to turn off the
system power before installing or removing a keyboard or mouse. The system BIOS can detectand
correct keyboards and mice plugged into the wrong PS/2 style connector.
The integrated 8042 microcontroller contains the AMI Megakey keyboard/mouse controller code
which, besides providing traditional keyboard and mouse control functions, supports Power-
On/Reset (POR) password protection. The POR password can be defined by the user via the Setup
program. The keyboard controller also provides for the following "hot key" sequences:
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<CTRL><ALT><DEL>: System software reset. This sequence performs a software reset of
the system by jumping to the beginning of the BIOS code and running the POST operation.
•
<CTRL><ALT><+> and <CTRL><ALT><->: Turbo mode selection. <CTRL><ALT><->
sets the system for de-turbo mode, emulating an 25 MHz AT, and <CTRL><ALT><+> sets
the system for turbo mode. Changing the Turbo mode may be prohibited by an operating
system, or when the CPU is in Protected mode or virtual x86 mode under DOS.
•
<CTRL><ALT><defined in setup>: A power down hot-key sequence takes advantage of the
SMM features of the Pentium Processor to greatly reduce the system's power consumption
while maintaining the responsiveness necessary to service external interrupts. A security hot-
key sequence provides password protection to the system.
1.7.3

Real time clock, CMOS RAM and battery

The integrated Real Time Clock (RTC) is DS1287 and MC146818 compatible and provides a time
of day clock, 100-year calendar with alarm features. The RTC can be set via the BIOS SETUP
program. The RTC also supports 242-byte battery-backed CMOS RAM in two banks which is
reserved for BIOS use. The CMOS RAM can be set to specific values or cleared to the system
default values using the BIOS SETUP program. Also, the CMOS RAM values can be cleared to
the system defaults by using a configuration jumper on the motherboard.
An external coin-cell style battery provides power to the RTC and CMOS memory. The battery
has an estimated lifetime of three years if the system is not plugged into the wall socket. When the
system is plugged in, power is supplied from the ATX power supply's 5v standby current to extend
the life of the battery.
Motherboard Description
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circuit which acts much like a self-
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