W83977ATF Datasheet, PDF (2/207 Pages) Winbond – WINBOND I/O

W83977ATF
WINBOND I/O
GENERAL DESCRIPTION
The W83977ATF 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, and OnNow CIR wake-up. In addition, the
W83977ATF provides IR functions: IrDA 1.1 (MIR for 1.152M bps or FIR for 4M bps) and TV remote
IR (Consumer IR, supporting NEC, RC-5, extended RC-5, and RECS-80 protocols).
The disk drive adapter functions of W83977ATF 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 W83977ATF greatly reduces the number of components
required for interfacing with floppy disk drives. The W83977ATF 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 W83977ATF 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 W83977ATF
provides independent 3rd UART(32-byte FIFO) dedicated for the IR function.
The W83977ATF 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 95^TM, which makes system resource allocation more efficient than ever.
The W83977ATF 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. The W83977ATF 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 AMIKEY^TM -2,
Phoenix MultiKey/42^TM, or customer code.
The W83977ATF 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 W83977ATF 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,
W83977ATF is made to meet the specification of PC97's requirement in the power management:
ACPI and DPM (Device Power Management).
Another benifit is that W83977ATF has the same pin assignment as W83977AF, W83977F,
W83977TF. This makes the design very flexible.
Publication Release Date: April 1998
-1-
Preliminary Revision 0.52