Sharp AR-5012 Service Manual page 74

PIN Input/
Signal code
No. Output
110 USBIN Input
111 Input
112 Input
113 Avss
114 GND
115 /SCANSP Output
116 /SCANST Output
117 /TRANSST Output
118 /PRINTST Output
119 SPMT3 Output
120 SPMT2/MIRCNT Output/
Input
121 SPMT1 Output
122 SPMT0 Output
123 GND
124 GND
125 Vcc
126 PSL Output
127
128 /CS2 Output
ASIC
Scan start
Image process section
CCD
PWB
b. ASIC (Signal table)
PIN
Signal Name IN/OUT
No.
1 cpu_ad7 IN
2 cpu_ad6 IN
3 cpu_ad5 IN
4 cpu_ad4 IN
5 VCC(CORE/DC) Power
3.3V
6 cpu_ad3 IN
7 cpu_ad2 IN
8 GND(CORE/DC) Power
9 cpu_ad1 IN
10 sgs OUT
Operating
IF PWB detection signal
NC
NC
DGND
DGND
Scan STOP signal
Scan START signal
ASIC transfer signal
Print Start signal
SPF motor signal
SPF motor signal/mirror
counter
SPF motor signal
SPF motor signal
DGND
DGND
CPU3.3V
Power save LED control
NC
ASIC chip select
Print control section
Resolution conversion,
Zooming, lmage
process circuit
Connected
Description
to
CPU CPU address bus
CPU CPU address bus
CPU CPU address bus
CPU CPU address bus
CPU CPU address bus
CPU CPU address bus
CPU CPU address bus
Tr array IC SPF/RSPF gate
solenoid control signal
"H":ON
AR-5012 ELECTRICAL SECTION 13 - 4
(3) Image process ASIC (HG73C119HF)
a. General
The ASIC is composed of the three major blocks: the image process
section, the print control section, and the I/F section.
Image process section:
With image data from the CCD PWB in the operation mode deter-
mined by the register setup, shading, AE process, input γ correc-
tion, area separation, filter process, resolution conversion, zoom
process, output γ correction, binary conversion (error diffusion,
dither method, simple binary conversion) are performed.
Print control section:
When copying, the image-processed data are outputted to the LSU
according to the LSU writing timing. When scanning, the image
data are made into 8bit width and outputted to the I/F section
(USB).
I/F section:
Controls the DRAM which is the image data buffer, and processes
data send/receive between the USB I/F and the IEEE1284 I/F.
The ASIC is controlled by writing the operation mode and the neces-
sary setup values of the operation mode into the ASIC control register
before starting each operation. (For ASIC Pin configuration, refer to the
table at the end of this document.)
Print data process circuit
PRINT control
DRAM control
ASIC control resistor
I/F section
DRAM
8MB or 16MB
PIN
Signal Name
No.
11 srrc
12 spus
13 spfs
14 mrps1
15 mrps2
LSU
To CPU bus
Connected
IN/OUT Description
to
OUT Tr array IC SPF/RSPF resist roller
clutch control signal
"H":ON
OUT Tr array IC SPF/RSPF document
feed solenoid control
signal "H":ON
OUT Tr array IC SPF/RSPF document
transport solenoid
control signal "H":ON
OUT Tr array IC SPF/RSPF motor
current control signal
OUT Tr array IC SPF/RSPF motor
current control signal
HSYNC
VSYNC