2-21
2.1.5.4
FDD interface circuit
The IT8673F is used as a floppy disc controller.
The FDC functions of the IT8673F are compatible with Devices 765A, DP8473. The interface circuit is made AT-compatible.
All the output signals to the FDD are processed in the open collector mode, pulled up with 1k
Ω
.
All the input signals from the FDD are pulled up with 2.2k
Ω
.
Protection for the WGATE signal is assured by the hardware, using its own signal of FDDEN.
+5V
+5V
1K
1K
1K
2.2K
2.2K
16
8
7
20
6
9
11
12
13
14
17
18
19
15
5
5
6
7
8
9
1 0
11
1 2
1 3
1 4
1 6
1 8
2 0
1 5
1 7
1 9
2 1
2 2
2 3
2 4
2 5
2 6
1
2
3
4
I N D E X
D R V 0
D R V 1
D S K C H G
M T 0
M T 1
F D I R
S T E P
W D ATA
W G AT E
T R K 0
W P R T
R D ATA
H D S E L
D E N S E L
I T 8 7 6 3 F
GND
I N D E X #
+5V
D R V 0 #
G N D
D C H G #
+ 5 V
M T R 0 #
D I R
D E N S L
S T E P #
G N D
W DATA #
G N D
W G AT E #
G N D
T R K 0 #
G N D
W P R T #
R DATA #
G N D
S I D E S E L 0
5 2 6 2 9 - 2 6 1 1
GATEARAY
2
158
W G AT E - I N #
W G AT E - O U T #
Summary of Contents for JS-170FR Series
Page 2: ......
Page 10: ......
Page 30: ...1 20 ...
Page 80: ...2 50 ...
Page 101: ...3 17 LCD DISPLAY TEST 6 Video Test ENTER 1 OK or 2 NG ...
Page 134: ...4 JS 170FR PCB s 4 1 Main PCB 4 1 1 Main PCB Schematic Diagram 1 10 4 1 ...
Page 135: ...4 1 1 Main PCB Schematic Diagram 2 10 4 2 ...
Page 136: ...4 1 1 Main PCB Schematic Diagram 3 10 4 3 ...
Page 137: ...4 1 1 Main PCB Schematic Diagram 4 10 4 4 ...
Page 138: ...4 1 1 Main PCB Schematic Diagram 5 10 4 5 ...
Page 139: ...4 1 1 Main PCB Schematic Diagram 6 10 4 6 ...
Page 140: ...4 1 1 Main PCB Schematic Diagram 7 10 4 7 ...
Page 141: ...4 1 1 Main PCB Schematic Diagram 8 10 4 8 ...
Page 142: ...4 1 1 Main PCB Schematic Diagram 9 10 4 9 ...
Page 143: ...4 1 1 Main PCB Schematic Diagram 10 10 4 10 ...
Page 144: ...4 1 2 Main PCB Parts Location 4 11 ...
Page 145: ...4 2 MB PCB 4 2 1 MB PCB Schematic Diagram 4 17 ...
Page 146: ...4 18 4 2 2 MB PCB Parts Location ...
Page 148: ...4 3 Peripheral PCB 4 3 1 Peripheral PCB Schematic Diagram 4 20 ...
Page 149: ...4 21 4 3 2 Peripheral PCB Parts Location ...
Page 152: ...5 2 Main PCB 75 Peripherals ...
Page 153: ...5 3 Power Supply Peripherals ...
Page 154: ...5 4 Customer Display Peripherals ...
Page 155: ...5 5 LCD Peripherals ...
Page 156: ...5 6 Inverter PCB Peripherals ...
Page 161: ...Printed in Japan ...