FDC37C935-QS Standard Microsystems (SMSC), FDC37C935-QS Datasheet - Page 123

• Manufacturer Part Number: FDC37C935-QS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C935-QS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

KEYBOARD AND RTC ISA INTERFACE
The FDC37C93x ISA interface is functionally
compatible with the 8042 style host interface. It
consists of the D0-7 data bus; the nIOR, nIOW
and
Note 1:
Keyboard Data Write
This is an 8 bit write only register.
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.
AUXOBF1 must be cleared in software.
Keyboard Command Write
This is an 8 bit write only register.
written, the C/D status bit of the status register
is set to one and the IBF bit is set.
ISA ADDRESS
the
0x60
0x64
These registers consist of three separate 8 bit registers. Status, Data/Command Write and
Data Read.
Status
If not enabled, the KIRQ and/or
ISA ADDRESS
0x70
0x71
( Addresses 0x60, 0x64, 0x70 and 0x71 are qualified by AEN.)
nIOW
0
1
0
1
register,
(R/W)
(R/W)
nIOR
Table 52 - ISA I/O Address Map
1
0
1
0
Input
BLOCK
RTC
RTC
When
When
Data
BLOCK
KDATA
KDATA
KDCTL
KDCTL
123
Address Register (70H)
Data Register (71H)
shows how the interface decodes the control
signals. In addition to the above signals, the
host interface includes keyboard and mouse
IRQ's.
Keyboard Status Read
This is an 8 bit read only register. Refer to the
description of the Status Register for more
information.
RTC Address Register
Writing to this register sets the CMOS address
that will be read or written.
RTC Data Register
A read of this register will read the contents of
the selected CMOS register.
register will write to the selected CMOS register.
Keyboard Data Write (C/D=0)(60H)
Keyboard Data Read (60H)
Keyboard Command Write (C/D=1)(64H)
Keyboard Status Read (64H)
FUNCTION
FUNCTION (NOTE 1)
A write to this