W83977F Datasheet, PDF (117/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
7. KEYBOARD CONTROLLER
PRELIMINARY
The KBC (8042 with licensed KB BIOS) circuit of W83977F/ AF is designed to provide the functions
needed to interface a CPU with a keyboard and/or a PS/2 mouse, and can be used with IBM^®-
compatible personal computers or PS/2-based systems. The controller receives serial data from the
keyboard or PS/2 mouse, checks the parity of the data, and presents the data to the system as a byte
of data in its output buffer. Then, the controller will assert an interrupt to the system when data are
placed in its output buffer. The keyboard and PS/2 mouse are required to acknowledge all data
transmissions. No transmission should be sent to the keyboard or PS/2 mouse until an acknowledge
is received for the previous data byte.
KINH
GP I/O PINS
Multiplex I/O PINS
P24
P25
P21
P17
P20
P27
8042
P10
P26
T0
P12~P16
P23
T1
P22
P11
Keyboard and Mouse Interface
KIRQ
MIRQ
GATEA20
KBRST
KDAT
KCLK
MCLK
MDAT
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Publication Release Date:March 1998
Revision 0.58