Overview; Start-Up Sequence - Canon iR3245 Series Service Manual

Chapter 4

4.3 Start-Up Sequence

4.3.1 Overview

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
The system software that controls the equipment is installed on HDD.
There are two types of system software; system software 1 for CPU1 (IC51), system software 2 for CPU2 (IC45).
When the host machine is started, the CPU1 loads the BIOS program in BIOS to the SDRAM for system processing, and then loads the system software 1 and the
system software 2 from HDD to the SDRAM for system processing. After that, the CPU 1 executes the system software 1.
The CPU2 requests the system software 2 to the CPU1 according to the BOOT program in the BOOTROM.
The system software 2 is transferred from the SDRAM for system processing to the SDRAM for image processing, and then executed.
SDRAM for image processing
System
MEMO:
The boot program (included in system program 1) of the CPU1 (IC51) is stored in HDD.
While the CPU1 or the CPU2 is reading system software from HDD to SDRAM and executing start-up sequence including hardware initialization, the following
screen is displayed, where the progress bar indicates the progress status.
HDD is accessed while the progress bar is being displayed. Never turn off the main power.
If the main power is turned off, a fault in HDD (E602) may occur.
4-6
Image area
area
CPU2 / (IC45)
BOOTROM
BOOT
program
: Flow of system program
: Flow of program at execution
SDRAM for system processing
System
Image area
area
CPU1 / (IC51)
BIOS
BIOS
program
Included in SYSTEM (system software).
Upgrade the version of SYSTEM in upgrading.
F-4-5
T-4-5
F-4-6
System System
software 1 software 1
System System
software 2 software 2
HDD
0019-3115