1.4. OVERALL MACHINE CONTROL
The FCE (Facsimile Control Engine) board contains the FCIP (Facsimile Con-
trol and Image Processor), DRAM, SRAM, System ROM, and video
processing memory, and it controls the entire system through the FDU (Fac-
simile Driver Unit) board.
There are two cpus in the machine: the main cpu (FCIP) on the FCE board
and the energy saver cpu on the FDU board. In energy saver mode, the main
CPU switches off and the energy saver CPU takes over.
The FCIP consists of the following component blocks:
•
MDM - Modem
•
RU8 CPU - Main CPU
•
DMAC - DMA Controller
•
LIF- Laser Interface
•
DIP - Digital Image Processor
•
PRIF - Printer Interface
•
DCR - Data Compression and Reconstruction
The 4 MB DRAM contains the SAF memory, ECM buffer memory, work area,
and page memory. For B4 size copies at 16 x 15.4 dot/mm resolution, a page
memory IC card is installed. A rechargeable battery backs up the DRAM for
one hour.
The system ROM uses a 512 KB (4 Mbits) flash ROM. Software in this ROM
can be rewritten from the IC card slot or by RDS.
FCE
FCE
Contact
Image
Sensor
Amp
Optional
100 Sheet
Cassette
Optional
Printer I/F
Energy
Saver
CPU
System
ROM
(Flash)
System
RAM
(SRAM)
DATA/ADDRESS BUS
Optional
RS232C I/F
Video
SRAM
Drivers
(FPD)
Driver
LDDR
Thermistor
Scanner
and
printer
components
and
sensors
Operation
Panel
Driver
Optional
Counter
Power
Pack
Speaker
NCU
Handset
Control
Signals
DRAM
System
RAM
ECM/SAF
Memory
Page
Memory
FCIP
MDM
CPU
RU8
DMAC
DCR
DIP
LIF
External I/O (EXIO)
DC-DC
Converter
Hybrid IC
(HIC)
PSU
Fusing
Lamp
Page
Memory
PRIF
PSIF
Sensors
Paper
feed
motor
Book scanner
components
and
ADF sensor
ADF
and
book
scanner
motors
FDU
H521V506.wmf
May 22nd, 1995
OVERALL MACHINE INFORMATION
OVERALL MACHINE CONTROL
1-13