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40930701TH DRAFT Vesion 16 /
Built-in device Function
Chip select controller Control of peripheral LSI, ROM, DRAM and I/O device
Bus controller
DRAM controller
DMA controller Transfer of data from Host I/F to RAM
Serial interface controller Control of RS232C serial interface
Parallel interface controller Control of Centronics parallel interface
Timer Generation of various control timing
Monitoring of paper running and paper size
Serial I/O port Control of serial interface between controller and operator panel, EEPROM
Control of a serial interface between controller and power supply board
I/O port Inputting of various sensor signals
Outputting of various control signals
Motor driver controller Control of Main Motor
Image processing circuit Executes the image data process for printing.
2.1 Main Control Board (BOARD-FFF)
The control board consists of an one chip CPU,a LSI, program/font ROM's, DRAM's, an
EEPROM, a host interface circuit, and a mechanism driving circuit.
(1) One-chip CPU
The one-chip CPU is a custom CPU (32-bit internal bus, 32-bit external bus, 120-MHz clock)
that incorporates an RISC CPU and its peripheral devices, and has the following functions.
(2) Program/font ROM's
• PCL ROM
The program/font ROM's store the HP LJ5 emulation program and various types of font.
MASK ROM is used as the program/font ROM's.
• PS ROM
The program/font ROM's store the Adobe PostScript Level 2 program and its fonts.