Interface Control - OKIDATA ML395C Service Manual

Printhead Drive Control
Printhead Drive Correction
Modifies the drive time under the following circumstances
Correction for edge pin driving
Correction for drive voltage fluctuations
Correction for head gap setting
Interface LSI (Q12: MSM60306)
The MSM60306 is an external interface LSI and controls the following functions.

Interface Control

Controls both the parallel and serial interface functions
Pin 4 of this LSI enables selection of the serial or parallel interface
Address Latch (for lower 8 bits of the master MPU)
MMU (Memory Management Unit) LSI (Q13: LC92018B-728)
This LSI is connected between the Master and Slave MPUs and performs these functions.
Master/Slave MPU Interface
Transfers commands and data between the Master and Slave MPUs
Memory Control
Extends the addressable memory by switching banks in/out
Dynamic RAM Refresh
Block Diagram of Microline 395