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©
2002 CANON INC. 2001 2001 2001 2001 CANON Printer Board-N1/iN-E5 REV.0 JAN. 2002
2-1
CHAPTER 2 OPERATION
1 Construction
1.1 Outline
The three Boards described in this manual are designed for the following functions:
· Printer Board
Develops print data written in PCL.
· Network Interface Board
Connects the host machine with a network.
· Hard Disk (HDD)
Stores print data and log data.
1.2 Functional Blocks of the Printer Board
The printer board is divided into the following functional blocks:
a.CPU
It is equipped with a Power PC (200 MHz), and it processes data as instructed by the
program contained in the built-in RAM in the CPU.
[1] Controls the SDRAM.
[2] Controls the ROM.
[3] Controls the printer board interface, hard disk interface, and network board interface.
[4] Communicates with the host machine.
[5] Controls the IEEE1284 parallel port interface.
[6] Controls compression/expansion of image data.
b. ASIC
The ASIC controls the workings of the printer board as instructed by the control pro-
gram stored in the ROM. Its main functions are as follows:
[1] Performs image smoothing.
[2] Performs EEPROM control.
c. DRAM
The DRAM possesses 8 M bytes of memory as standard, and functions as follows:
[1] Stores print data entered from an external device (reception buffer).
[2] Stores code data or pattern data resulting from conversion of image data.
[3] Stores fonts processed by the printer board.
The Board is equipped with a single slot, and addition of a 32 MB or 64 MB expansion
RAM DIMM will enable storage of up to 72 M bytes of data.
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