SOYO SY-7IWA-F I/O Interface Controller, Real-Time Clock, Cmos SRAM, and Battery, Serial Ports

Motherboard Description SY-7IWA-F

1-7.4 Real-Time Clock, CMOS SRAM, and Battery

The real-time clock is compatible with DS1287 and MC146818 components. The clock provides a time-of-day clock and a multicentury calendar with alarm features and century rollover. The real-time clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are reserved for BIOS use.

The time, date, and CMOS values can be specified in the Setup program. The CMOS values can be returned to their defaults by using the Setup program.

1-8 I/O INTERFACE CONTROLLER

The motherboard uses the Winbond W83627HF-AW I/O controller which features:

•Single diskette drive interface

•Two serial ports

•FIFO supports on both serial and diskette interfaces

•One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support

•PS/2 style mouse and keyboard interfaces

•PCI PME interface

•Intelligent auto power management, including:

ØShadowed write-only registers for ACPI compliance

ØProgrammable wake-up event interface

The Setup program provides configuration option for the I/O controller.

1-8.1 Serial Ports

The motherboard has one 9-pin D-Sub serial port connector located on the back panel. The NS16C5450-compatible UARTs support data transfers at speeds up to 115.2 Kbits/sec with BIOS support.

1-8.2 Parallel Port

The connector for the multimode bi-directional parallel port is a 25-pin D- Sub connector located on the back panel of the motherboard. In the Setup program, there are four options for parallel port operation:

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