Chapter 1: Introduction
1-13
1-7 Super
I/O
The disk drive adapter functions of the Super I/O Winbond
®
BMC chip includes a
fl oppy disk drive controller that is compatible with industry standard 82077/765, a
data separator, write pre-compensation circuitry, decode logic, data rate selection,
a clock generator, drive interface control logic and interrupt and DMA logic. The
wide range of functions integrated onto the Super I/O greatly reduces the number
of components required for interfacing with fl oppy disk drives.
The Super I/O provides two high-speed, 16550 compatible serial communication
ports (UARTs), one of which supports serial infrared communication. Each UART in-
cludes a 16-byte send/receive FIFO, a programmable baud rate generator, complete
modem control capability and a processor interrupt system. Both UARTs provide
legacy speed with baud rate of up to 115.2 Kbps as well as an advanced speed
with baud rates of 250 K, 500 K, or 1 Mb/s, which support higher speed modems.
The Super I/O provides functions that comply with ACPI (Advanced Confi guration
and Power Interface), which includes support of legacy and ACPI power manage-
ment through a SMI or SCI function pin. It also features auto power management
to reduce power consumption.
The IRQs, DMAs and I/O space resources of the Super I/O can be fl exibly adjusted
to meet ISA PnP requirements, which support ACPI and APM (Advanced Power
Management).
