W83977TF-A Ver la hoja de datos (PDF) - Winbond

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W83977TF-A

WINBOND I/O

Winbond 

W83977TF

WINBOND I/O

GENERAL DESCRIPTION

The W83977TF is an evolving product from Winbond's most popular I/O chip W83877F --- which

integrates the disk drive adapter, serial port (UART), IrDA 1.0 SIR, parallel port, configurable plug-and-

play registers for the whole chip --- plus additional powerful features: ACPI, 8042 keyboard controller

with PS/2 mouse support, 23 general purpose I/O ports, full 16-bit address decoding, OnNow keyboard

wake-up, OnNow mouse wake-up.

The disk drive adapter functions of W83977TF 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 into the W83977TF greatly reduces the number of components required for

interfacing with floppy disk drives. The W83977TF 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,1 Mb/s, and 2 Mb/s.

The W83977TF 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. Both

UARTs provide legacy speed with baud rate up to 115.2k bps and also advanced speed with baud rates

of 230k, 460k, or 921k bps which support higher speed modems.

The W83977TF supports one PC-compatible printer port (SPP), Bi-directional Printer port (BPP) and

also Enhanced Parallel Port (EPP) and Extended Capabilities Port (ECP). Through the printer port

interface pins, also available are: Extension FDD Mode and Extension 2FDD Mode allowing one or two

external floppy disk drives to be connected.

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

selection. Furthermore, the configurable PnP features are compatible with the plug-and-play feature

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

W83977TF provides functions that comply with ACPI (Advanced Configuration and Power Interface),

which includes support of legacy and ACPI power management through SMI or SCI function pins.

W83977TF also has auto power management to reduce power consumption.

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The W83977TF provides a set of flexible I/O control functions to the system designer through a set of

General Purpose I/O ports. These GPIO ports may serve as simple I/O or may be individually

configured to provide a predefined alternate function.

W83977TF is made to fully comply with Microsoft PC97 Hardware Design Guide. IRQs, DMAs, and

I/O space resource are flexible to adjust to meet ISA PnP requirement. Moreover W83977TF is made to

meet the specification of PC97's requirement in the power management: ACPI and DPM (Device

Power Management).

Another benifit is that W83977TF has the same pin assignment as W83977AF, W83977F, W83977ATF.

This makes the design very flexible.

Publication Release Date: April 1998

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Preliminary Revision 0.62

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