GENERAL DESCRIPTION

This data sheet covers two products: W83977F, and W83977AF whose pin assignment, and most of the functions are the same. W83977AF is an advanced version of W83977F featuring the FIR function.

FEATURES

General

• Plug & Play 1.0A Compliant

• Support 13 IRQs, 4 DMA channels, full 16-bit addresses decoding

• Capable of ISA Bus IRQ Sharing

• Compliant with Microsoft PC97 Hardware Design Guide

• Support DPM (Device Power Management), ACPI

• Programmable configuration settings

• 24 or 14.318 Mhz clock input

FDC

• Compatible with IBM PC AT disk drive systems

• Variable write pre-compensation with track selectable capability

• Support vertical recording format

• DMA enable logic

• 16-byte data FIFOs

• Support floppy disk drives and tape drives

• Detects all overrun and underrun conditions

• Built-in address mark detection circuit to simplify the read electronics

• FDD anti-virus functions with software write protect and FDD write enable signal (write data signal was forced to be inactive)

• Support up to four 3.5-inch or 5.25-inch floppy disk drives

• Completely compatible with industry standard 82077

• 360K/720K/1.2M/1.44M/2.88M format; 250K, 300K, 500K, 1M, 2M bps data transfer rate

• Support 3-mode FDD, and its Win95 driver

UART

• Two high-speed 16550 compatible UARTs with 16-byte send/receive FIFOs

• 3rd UART with 32-byte send/receive FIFO is supported for IR function [W83977AF only]

• MIDI compatible

• Fully programmable serial-interface characteristics:

   --- 5, 6, 7 or 8-bit characters

   --- Even, odd or no parity bit generation/detection

   --- 1, 1.5 or 2 stop bits generation

• Internal diagnostic capabilities:

   --- Loop-back controls for communications link fault isolation

   --- Break, parity, overrun, framing error simulation

• Programmable baud generator allows division of 1.8461 Mhz and 24 Mhz by 1 to (216-1)

• Maximum baud rate up to 921k bps for 14.769 Mhz and 1.5M bps for 24 Mhz

Infrared

• Support IrDA version 1.0 SIR protocol with maximum baud rate up to 115.2K bps

• Support SHARP ASK-IR protocol with maximum baud rate up to 57,600 bps

• Support IrDA version 1.1 MIR (1.152M bps) and FIR (4M bps) protocol [W83977AF only]

   --- Single DMA channel for transmitter or receiver

   --- 3rd UART with 32-byte FIFO is supported in both TX/RX transmission [W83977AF only]

   --- 8-byte status FIFO is supported to store received frame status (such as overrun CRC error, etc.)

• Support auto-config SIR and FIR [W83977AF only]

Parallel Port

• Compatible with IBM parallel port

• Support PS/2 compatible bi-directional parallel port

• Support Enhanced Parallel Port (EPP) - Compatible with IEEE 1284 specification

• Support Extended Capabilities Port (ECP) - Compatible with IEEE 1284 specification

• Extension FDD mode supports disk drive B; and Extension 2FDD mode supports disk drives A and B through parallel port

• Enhanced printer port back-drive current protection

Advanced Power Management (APM) Controlling

• Power turned on when RTC reaches a preset date and time

• Power turned on when a ring pulse or pulse train is detected on the PHRI, or when a high to low transition on PWAKIN1, or PWAKIN2 input signals

• Power turned on when PANSW input signal indicates a switch on event

• Power turned off when PANSW input signal indicates a switch off event

• Power turned off when a fail-safe event occurs (power-save mode detected but system is hung up)

• Power turned off when software issues a power off command

Keyboard Controller

• 8042 based with optional F/W from AMIKKEYTM-2, Phoenix MultiKey/42TM or customer code with 2K bytes of programmable ROM, and 256 bytes of RAM

• Asynchronous Access to Two Data Registers and One status Register

• Software compatibility with the 8042 and PC87911 microcontrollers

• Support PS/2 mouse

• Support port 92

• Support both interrupt and polling modes

• Fast Gate A20 and Hardware Keyboard Reset

• 8 Bit Timer/ Counter; support binary and BCD arithmetic

• 6, 8, 12, or 16 Mhz operating frequency (16 Mhz available only if input clock rate = 14.318 Mhz)