GENERAL DESCRIPTION

One of Winbonds popular series of I/O chips, the W83877F integrates a disk drive adapter, serial port (UART), parallel port, IDE bus interface, and game port decoder onto a single chip. The W83877F is an enhanced version of the W83777F, with additional powerful features such as configurable plug-and-play registers for the whole chip and infrared support in one of the serial ports.

FEATURES

FDC:

● Compatible with IBM PC AT disk drive systems

● Variable write pre-compensation with track selectable capability

● DMA enable logic

● Non-burst mode DMA option

● Supports floppy disk drives and tape drives

● Detects all overrun and underrun conditions

● Data rate and drive control registers

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

● IBM PC system address decoder

● Supports up to two embedded hard disk drives (IDE AT BUS)

● Single 24 MHz crystal input

● FDD anti-virus functions with software write protect and FDD write enable signal, write data signal force inactive

● Supports 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 bps data transfer rate

● Supports vertical recording format

● 16-byte data FIFOs

UART:

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

● 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)

Parallel Port:

● Compatible with IBM parallel port

● Supports parallel port with bidirectional lines

● Supports Enhanced Parallel Port (EPP)

- Compatible with IEEE 1284 specification

● Supports Extended Capabilities Port (ECP)

- Compatible with IEEE 1284 specification

● Extension FDD mode supports disk drive B through parallel port

● Extension Adapter Mode supports pocket devices through parallel port

● Extension 2FDD mode supports disk drives A and B through parallel port

● JOYSTICK mode supports joystick through parallel port

Others:

● Programmable configuration settings

● Immediate or automatic power-down mode for power management

● All hardware power-on settings have internal pull-up or pull-down resistors as default value

● Packaged in 100-pin QFP

● Configurable Plug and Play registers

● Infrared communication port