Panasonic JS-170FR Series, Service Manual

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2-15
2.1.5 IT8673F circuit
The IT8673F is used as an LSI for the control of peripheral I/O circuits, keyboard, and mouse.
The IT8673F functions as the two UART units (equivalent to 16C550), the parallel port with the FDC (equivalent to DP8473)
incorporating the analog data separator, and the #8042 compatible keyboard controller having the mouse control function
conforming to the PS/2 Specification.
An I/O address decoder circuit conforming to the Plug & Play Specification V1.0a is incorporated to realize AT compatible
functions.
The respective functions are set up with the software.
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
A1 3
A1 2
A1 1
A1 0
A9
A8
A7
A6
A5
A4
IO W #
IO R #
AEN
IO CHRDY
RESET
DRQ2
7 5
1 1 9
3 3
1 1 8
3 7
3 8
2 5
2 6
2 7
2 8
2 9
3 0
3 1
3 2
9 1
9 2
39
40
41
42
44
45
46
47
7 8
C LK I N
I T 8 7 6 3 F
SD7
SD6
SD5
SD4
SD3
SD2
SD1
S D 0
S A1 3
S A1 2
S A1 1
S A1 0
S A9
S A8
S A7
S A
S A5
S A4
IOW #
IO R #
AEN
I O CHRD Y
DRQ2
RESE T DRV
S D { 0 : 7 }
S A { 0 : 1 5 }
T C
1 2 0
T C
KRST #
8 3
RC IN #
PC I C L K
3 6
PC I - CL K
A1 5
A1 4
9 5
9 6
S A1 5
S A1 4
DRQ1
7 4
DRQ1
DRQ3
7 6
DRQ3
DACK1 #
8 7
* D A CK1
DACK2 #
8 8
* D A CK2
DACK3 #
8 9
* D A CK3
S I RQ
3 4
SER I RQ
G A2 0
8 6
A2 0 GAT E
24MHz
A3
A2
A1
A0
2 1
2 2
2 3
2 4 S A3
S A2
S A1
S A0