Oki B 4100 Maintenance Manual page 408

A3.2.6 M17 Circuit Diagram (Page 6/17)
1. Block diagram
The circuit diagram shown on page 6/17 consists of the IEXSEED (image processing LSI) of IC20
and SRAM.
Figure A3.2.6 shows the related signals of IEXSEED.
2. Functions
IEXSEED is newly developed LSI for the image processing of OKIFAX 5000 series.
IEXSEED contains the following functions:
• Contact image sensor driver
• Send motor forward rotation/chopping control
• Line buffer control
3. SRAM
256 KByte SRAM x 1 (RAM1)
Stores the dark/light level correction data.
Error diffusion data and image separation data are processed by IEXSEED.
Address bus
Data Bus
IC6
A/D convertor
CLK (20 MHz)
40055101TH Rev.4
IC20
A0 - A3
AD0 - AD15
SDT2 - SDT7
IEXSEED
Figure A3.2.6 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
256 KB
M S-motor
CIS
Contact
image
sensor
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