KBD42W11 Datasheet, PDF (1/16 Pages) SMSC Corporation – Keyboard controller is programmed to support

KBD42W11
Keyboard Controller
FEATURES
• Supports IBM PC and Compatible System
Designs
• Runs Much Faster Than Traditional
Keyboard Controllers
• Host interface Compatible with Traditional
Keyboard Controller
• 6 MHz – 12 MHz Operating Frequency
• Communicates with Keyboard Directly
• High-reliability CMOS Technology
• 40 Pin DIP and 44 Pin PLCC Package
GENERAL DESCRIPTION
The KBD42W11 keyboard controller is
programmed to support the IBM® compatible
personal computer keyboard serial interface. The
keyboard controller receives serial data from the
keyboard, checks the parity of the data,
translates the scan code, and presents the data
to the system as a byte of data in its output
buffer. The controller will interrupt the system
when data is placed in its output buffer. The byte
of data will be sent to the keyboard serially with
an odd parity bit automatically inserted. The
keyboard is required to acknowledge all data
transmissions. No transmission should be sent to
the keyboard until acknowledgment is received
for the previous byte sent.
The KBD42W11 keyboard controller and BIOS to
improve the performance of IBM PC machines
and their compatibles. A hardwire methodology
is used in this keyboard controller instead of a
software implementation, as in the traditional
8042 keyboard BIOS. This enables the keyboard
controller to respond instantly to all commands
sent from the keyboard to the CPU BIOS.
The KBD42W11 enables popular programs such
as AutoCAD^®, Microsoft^® Windows™, NOVELL^®,
and other programs to run much faster.
IBM is a registered trademark of International Business
Machines Corporation. AutoCAD is a registered trademark
of Autodesk, Inc. Microsoft is a registered trademark and
Windows is a trademark of Microsoft Corporation.
NOVELL is a registered trademark of Novell, Inc.
Standard Microsystems is a registered trademark and
SMSC is a trademark of Standard Microsystems
Corporation. Other product and company names are
trademarks or registered trademarks of their respective
holders.