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W83877F

WINBOND I/O

Winbond 

W83877F

WINBOND I/O

GENERAL DESCRIPTION

One of Winbond's 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.

The disk drive adapter functions of the W83877F 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 generator, drive interface control logic, and interrupt and DMA logic. The

wide range of functions integrated onto the W83877F greatly reduces the number of components

required for interfacing with floppy disk drives. The W83877F supports four 360K, 720K, 1.2M, 1.44M,

or 2.88M disk drives and data transfer rates of 250 Kb/S, 300 Kb/S, 500 Kb/S, and 1 Mb/S.

The W83877F provides two high-speed 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 system.

The W83877F supports one PC-compatible printer port. Additional bidirectional I/O capability is

available by hardware control or software programming. The parallel port also supports the Enhanced

Parallel Port (EPP) and Extended Capabilities Port (ECP).

The W83877F supports two embedded hard disk drive (AT bus) interfaces and a game port with

decoded read/write output. The chip's Extension FDD Mode and Extension 2FDD Mode allow one or

two external floppy disk drives to be connected to the computer through the printer interface pins in

notebook computer applications.

The Extension Adapter Mode of the W83877F allows pocket devices to be installed through the

printer interface pins in notebook computer applications according to a protocol set by Winbond, but

with upgraded performance. The JOYSTICK mode allows a joystick to be connected to a parallel port

with a signal switching cable.

The configuration registers support mode selection, function enable/disable, and power down function

selection. Moreover, the configurable PnP registers are compatible with the plug-and-play feature in

Windows 95TM , which makes system resource allocation more efficient than ever.

Publication Release Date: January 1996

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Revision A2

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