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FO-2970MU
(2) Panel control block
The following controls are performed by the Gate array (LR38784).
•
Operation panel key scanning
•
Operation panel LCD display
(3) ASIC/Printing control block
1) ASIC [LR38784A 208pin (embedded gate array)
functions(IC15)
1
Mapper
Mapping can connect the modem and image handing LSI to a do-
main of CS2 (Chip Select 2).
2
Real-time-clock interface
This interface has the clock-synchronous type serial transfer mode
and can write and read to the CLOCK IC (SM8578BV or NJU6355).
3
Image handing LSI interface
This interface has parallel or serial transfer mode with the image
handing LSI.
4
GDI ASIC
This function GDI i/f for PC printing only.
5
IEEE1284
This function IEEE 1284 i/f for PC scanning and PC fax.
6
Sending motor control
This function outputs the sending motor control signals of 2 or 1-2
phase excitation to the motor driver.
7
Buzzer and Ringer control
This function outputs a buzzer (1042Hz) or a ringer (controlled sig-
nal) signal.
8
Laser signal control
This function controls to output laser beam.
9
Protection circuits
LR38784A has protection circuits for a pick-up-solenoid and a heater.
LR38784A (IC15) Terminal description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
5 – 6
I/O
Signal name
–
GND
–
GND
I
LCPD3
I
LCPD4
I
LCDREQ
TO
LEDDV4
TO
LEDDV3
TO
LEDDV2
TO
LEDDV1
TO
RS
O
LCDACKZ
TO
E
IOR
LD3
–
GND
IOR
LD2
IOR
LD1
IOR
LD0
IU
SEN4Z
IU
SEN3Z
IU
SEN2Z
IU
SEN1Z
IU
SEN0Z
I
FRSNS
I
ORGSNS
I
B4SNS
I
MDMINTZ
O
MDMRDZ
O
MDMWRZ
O
MDMCSZ
O
MDMRSTZ
–
GND
IS
CK16M
O
OE3Z
O
WE3Z
O
BZOUT
I
LCINT
O
LCRDZ
O
LCWRZ
I
SD
I
SDE
I
SDCK
ID
MTST
I
DACK0Z
I
DACK1Z
I
DRAK0
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