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W83977CTF

WINBOND I/O

Winbond 

W83977EF/ CTF

PRELIMINARY

GENERAL DESCRIPTION

The W83977EF/CTF 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, and

configurable plug-and-play registers for the whole chip --- plus additional powerful features: ACPI,

8042 keyboard controller with PS/2 mouse support, 14 general purpose I/O ports, full 16-bit address

decoding, OnNow keyboard Wake-Up, OnNow mouse Wake-Up and OnNow CIR(W83977CTF only)

Wake-Up.

The disk drive adapter functions of W83977EF/CTF 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 W83977EF/CTF greatly reduces the number of

components required for interfacing with floppy disk drives. The W83977EF/CTF 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 W83977EF/CTF 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 W83977EF/CTF 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.

W83977EF/CTF provides functions that comply with ACPI (Advanced Configuration and Power

Interface), including support for legacy and ACPI power management through SMI or SCI function

pins. W83977EF/CTF also has auto power management to reduce power consumption.

The keyboard controller is based on 8042 compatible instruction set, with a 2K Byte programmable

ROM and a 256-Byte RAM bank. Keyboard BIOS firmware is available with optional AMIKEYTM -2,

Phoenix MultiKey/42TM, or customer code.

The W83977EF/CTF provides the system designer with a set of flexible I/O control functions 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.

The W83977EF/CTF also supports Power-loss control, and ensures that the system never fails to

detect any Wake-Up event provided by a chipset such as INTEL PIIX4 TM.

W83977EF/CTF is made to fully comply with Microsoft PC98 Hardware Design Guide. IRQs,

DMAs, and I/O space resource are flexible to adjust to meet ISA PnP requirements. Moreover,

W83977EF/CTF is made to meet the specification of PC98's requirements in power management:

ACPI and DPM (Device Power Management).

Another benifit is that W83977EF/CTF has the same pin assignment as W83977AF, W83977F,

W83977TF, W83977ATF. This makes the design very flexible.

Publication Release Date: March 1999

-1 -

Revision A1

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