Canon imagePRESS 1135 Series Service Manual page 54

2
Technology > Controller System > Overview > Startup Sequence
■ Startup Sequence
System software that controls the host machine is stored on HDD.
There are 2 system software such as system software 1 for CPU1 (IC6) on main controller
PCB 1 and system software 2 for CPU2 (IC54) on main controller PCB 2.
At power ON of the host machine, CPU1 on main controller PCB 1 loads the BIOS program
in BIOS to the system processing SDRAM, and loads the system software 1 and the system
software 2 from HDD to the system processing SDRAM. Then CPU1 on main controller PCB1
executes the system software 1.
CPU2 on main controller PCB 2 requests the system software 2 to CPU1 on main controller
PCB1 according to the BOOT program in BOOTROM.
System software 2 is transferred from the system processing SDRAM to the image
processing SDRAM and executed.
Main controller PCB 2 Main controller PCB 1
Image processing SDRAM System processing SDRAM
System System
Image area
area
[4]
CPU / (IC54)
[4]
[3]
BOOTROM
BOOT
program
:Flow of system program
:Flow of program in operatio
:Program executed area
MEMO:
Boot program (included in the system program 1) of CPU (IC6) on the main controller
PCB 1 is stored on HDD.
2 Technology > Controller System > Overview > Startup Sequence
Image area
System System
area
software 1 software 1
System System
[1]
software 2 software 2
CPU / (IC6)
[2]
[1]
BIOS
HDD
BIOS
program
Included in SYSTEM
(system software).
When upgrading,
upgrade the SYSTEM.
While CPU1 and CPU2 are reading the system software from HDD to SDRAM and executing
the startup sequence including hardware initialization, following screen is displayed and
progress status is shown on the progress bar.
F-2-8
2-6
Progress Bar
F-2-9
2-6