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Motherboard Description SY-7IWA-F
13
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:
l Single diskette drive interface
l Two serial ports
l FIFO supports on both serial and diskette interfaces
l One parallel port with Extended Capabilities Port (ECP) and
Enhanced Parallel Port (EPP) support
l PS/2 style mouse and keyboard interfaces
l PCI PME interface
l Intelligent auto power management, including:
Ø Shadowed write-only registers for ACPI compliance
Ø Programmable 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: