Oki OKIOFFICE84 Maintenance Manual page 289

A3.1.12 R51 Circuit Diagram (Page 12/12)
1. Block diagram
The circuit diagram shown on page 12/12 consists of the IEXSEED300 (image process-
ing LSI) of IC16 and SRAM.
Figure A3.1.16 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 x 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)
IC16
IEXSEED
Figure A3.1.16 Related Signals of IEXSEED
A3 - 19
MAD0 - MADE
MDT 0 - MDT7
MRD, MWR
PHSA-PHSD
DRV
MPT0-MPT3
PDCK (833KHz/1.25MHz)
ADCLK (833KHz/1.25MHz)
LEDON-P
MISP
R51
RAM1
SRAM
32 KB
M S-motor
CIS
Contact
image
sensor
40672201TH Rev. 4