FDC37M607 datasheet(114/182 Pages) SMSC

114 / 182 page

114

KEYBOARD ISA INTERFACE

The FDC37M60x ISA interface is functionally

compatible with the 8042 style host interface. It

consists of the D0-7 data bus; the nIOR, nIOW

and

the

Status

Input

Data

shows how the interface decodes the control

signals.

In addition to the above signals, the

host interface includes keyboard and mouse

IRQs.

Table 48 - ISA I/O Address Map

ISA ADDRESS

nIOW

nIOR

BLOCK

FUNCTION (NOTE 1)

0x60

KDATA

Keyboard Data Write (C/D=0)

KDATA

Keyboard Data Read

0x64

KDCTL

Keyboard Command Write (C/D=1)

KDCTL

Keyboard Status Read

Note 1: These registers consist of three separate 8 bit registers. Status, Data/Command Write and

Data Read.

Keyboard Data Write

This is an 8 bit write only register.

When

written, the C/D status bit of the status register

is cleared to zero and the IBF bit is set.

Keyboard Data Read

This is an 8 bit read only register. If enabled by

"ENABLE FLAGS", when read, the KIRQ output

is cleared and the OBF flag in the status register

is cleared.

If not enabled, the KIRQ and/or

AUXOBF1 must be cleared in software.

Keyboard Command Write

This is an 8 bit write only register.

When

written, the C/D status bit of the status register

is set to one and the IBF bit is set.

Keyboard Status Read

This is an 8 bit read only register. Refer to the

description of the Status Register for more

information.

FDC37M607 Datasheet(PDF) 114 Page - SMSC Corporation

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