Xerox WorkCentre Pro 412 Service Manual page 67

5-3-5 Program ROM (Flash Memory) Control (WorkCentre Pro 412 & FaxCentre F12)
1) Device
TYPE No.
CAPACITY
1) Device (WorkCentre M15/M15i)
TYPE No.
CAPACITY
2) Programming
BEFORE ASS'Y
AFTER ASS'Y
3) Operating Principle
When the RCSO(ROM CHIP SELECT) signal is activated from the CPU after the POWER is ON, it acti-
vates RD SIGNAL and reads the DATA(HIGH/LOW) stored in the FLASH MEMORY to control the overall
system. The FLASH MEMORY may also write. When turning the power on, press and hold the key (power
switch) for 2 - 3 seconds, then the LED will scroll and the PROGRAM DOWNLOAD MODE will be acti-
vated. In this mode, you can download the program through the parallel port.
WorkCentre Pro 412, FaxCentre F12 &
WorkCentre M15/M15i
AM29F800B
4 Mbyte (512K * 16BITS * 4)
AM29LU160DB
4 MBYTE (1MB * 16BITS * 2)
EPROM programmer or programming at the factory
Download from PC
Write Timing Diagram for Two Beat Burst Cycle
3/03
Circuit Description
5-29