A3.1.3.1 Overview - Oki OF5900 Maintenance Manual

A3.1.3 Scanner Control

A3.1.3.1 Overview

This system uses a monochromic 300-DPI image sensor. It also uses a 1-chip LSI for
sensor control.
The overall block diagram is shown on the next page.
(1) Interface
The IOGA5 receives image data from the sensor control LSI, and sends it to the host
CPU in blocks of 16 bits (2 words).
CPU
(2) Sensor Specifications
Pixel density: 300 DPI
Number of significant pixels: 2552 dots
Pixel clock frequency: 2.5 MHz
The input signal timing chart is shown below.
CLK1
S1
OKIFAX 5700/5900
MDREQ
IOGA5
MDACKn
Data bus
(16 bit)
400nS
SDREQ
Sensor control
LSI
SDACKn
Data bus
(8 bit)
1.25 ms (line storage time)
A3 - 5
R76-/R76-2
SI
Image sensor
CLK