W83977EF Winbond Electronics Corp America, W83977EF Datasheet - Page 7

• Manufacturer Part Number: W83977EF
• Description: Description = W83877TF Plus Kbc, GP I/O, Wake-Up, Power Fail Resume ;; Package = QFP 128
• Manufacturer: Winbond Electronics Corp America

W83977EF
GENERAL DESCRIPTION
The W83977EF 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, 14 general purpose I/O ports, full 16-bit address decoding,
OnNow keyboard Wake-Up, OnNow mouse Wake-Up.
The disk drive adapter functions of W83977EF 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 greatly reduces the number of components required
for interfacing with floppy disk drives. The W83977EF 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 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 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
TM
demand of Windows 95
, which makes system resource allocation more efficient than ever.
W83977EF provides functions that complies with ACPI (Advanced Configuration and Power
Interface), which includes support of legacy and ACPI power management through SMI or SCI
function pins. W83977EF also has auto power management to reduce power consumption.
The keyboard controller is based on 8042 compatible instruction set with a 2K Byte programmable
TM
ROM and a 256-Byte RAM bank. Keyboard BIOS firmware are available with optional AMIKEY
2,
-
TM
Phoenix MultiKey/42
, or customer code.
The W83977EF 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.
The W83977EF also supports Power-loss control, and makes the system never miss to detect any
TM
Wake-Up event provided by the chipset such as INTEL PIIX4
.
W83977EF 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 requirement. Moreover W83977EF is made
to meet the specification of PC98's requirement in the power management: ACPI and DPM (Device
Power Management).
Another benifit is that W83977EF is of the same pin assignment of W83977AF, W83977F, W83977TF,
W83977ATF. Thus makes the design very flexible.
Publication Release Date: April 2003
-1 -
Revision 1.1