Chapter 1: Introduction
1-19
1-9 Super I/O
The disk drive adapter functions of Super I/O chip include a floppy disk drive
controller compatible with the industry standard 82077/765, data separator,
write pre-compensation circuit, decode logic, data rate selection, clock gen-
erator, drive interface control logic, and interrupt and DMA logic. The wide
range of functions integrated onto the Super I/O greatly reduced the number
of components required for interfacing with floppy disk drives. The Super I/O
supports four 360 K, 720 K, 1.2 M, 1.44 M or 2.88 M disk drives and data
transfer rates of 250 Kb/s, 500 Kb/s or 1 Mb/s.
The Super I/O provides two high speed serial communication ports (16550
UARTs), one of which supports serial Infrared communication. Each UART
includes 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 up to 115.2 Kbps and also ad-
vanced speed with baud rates of 230 K, 460 K, or 921 Kbps which support
higher speed modems.
The Super I/O supports one PC-compatible printer port (SPP), Bi-directional
Printer Port (BPP) and also Enhanced Parallel Port (EPP) and Extended Ca-
pabilities Port (ECP). Also available, through the printer port interface pins,
are: Extension FDD Mode and Extension 2FDD Mode allowing one or two
external floppy disk drives to be connected.
The Super I/O provides functions that comply with ACPI (Advanced Configu-
ration and Power Interface), which includes support of legacy and ACPI power
management through SMI or SCI function pin. It also has auto power manage-
ment to reduce power consumption.
The Super I/O complies with Microsoft PC97 Hardware Design Guide. IRQs,
DMAs, and I/O space resources are flexible to adjust to meet ISA PnP require-
ment. Moreover, it meets the specification of PC97's requirement in the power
management: ACPI and DPM (Device Power Management).
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