Circuit Diagram (12/13) - Oki OKIFAX4550 Maintenance Manual

3.12 46F Circuit Diagram (12/13)
1. Block diagram
46F-PCB circuit diagram (12/13) shown the consists of the IEXSEED300 (image processing
LSI) of IC16 and SRAM.
Figure A.17 shows the related signals of IEXSEED300.
2. Functions
IEXSEED300 is d eveloped LSI for the image processing.
IEXSEED300 contains the following functions:
• Contact image sensor driver
• Send motor forward rotation/chopping control
• Line buffer control
3. SRAM
32 KByte SRAM × 1 (RAM1)
Stores the dark/light level correction data.
Error diffusion data and image separation data are processed by IEXSEED.
A0 - A3
Address bus
AD0 - AD15
Data Bus
IC6
SDT2 - SDT7
A/D convertor
CLK (20 MHz)
41309401TH Rev.4
IC16
IEXSEED
Figure A.17 Related Signals of IEXSEED
MAD0 - MADE
MDT 0 - MDT7
MRD, MWR
PHSA-PHSD
DRV
MPT0-MPT3
PDCK (833KHz/1.25MHz)
ADCLK (833KHz/1.25MHz)
LEDON-P
MISP
RAM1
SRAM
32 KB
M S-motor
CIS
Contact
image
sensor
329 /