Chapter 1: Introduction
1-19
1-7 Super I/O
The functions of the disk drive adapter for the Super I/O chip include a
floppy 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
floppy disk drives.
The functions of the disk drive adapter for the Super I/O chip include a
floppy 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
floppy disk drives. The Super I/O supports four 360K, 720K, 1.2M, or 1.44M
disk drives and data transfer rates of 250 Kbps, 500 Kbps or 1 Mbps.
It also provides two high-speed, 16550 compatible serial communication
ports (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 sys-
tem. Both UARTs provide legacy speed with a baud rate of up to 115.2
Kbps as well as an advanced speed with baud rates of 250 Kbps, 500
Kbps or 1 Mbps to support higher speed modems.
The Super I/O supports one of the following: PC-compatible printer port
(SPP), bi-directional printer port (BPP), Enhanced Parallel Port (EPP) or Ex-
tended Capabilities Port (ECP). The Super I/O provides functions that com-
ply with ACPI (Advanced Configuration and Power Interface), which in-
cludes support of legacy and ACPI power management through an 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 adjust flex-
ibly to meet ISA PnP requirements, which suppport ACPI and Advanced
Power Management (APM).
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