Epson AcuLaser C2800 Service Manual page 74

AcuLaser C2800/C2800D/C3800/C3800D
DIAGRAM
Overview of connections of the clock and the data bus is shown below:
Figure 2-56. Circuity Block Diagram
OPERATING PRINCIPLES
IC Name
CPU
FMV
FAIO
PLD (Programmable Logic Device)
PWM (Pulse Width Modulation)
EEPROM
SSCG
(Spread Spectrum Clock Generator)
PCC
RESET IC
Signal Name
CPUCLK
SPD
EVCLK
PDCLK
VIDEOX CMYK
HSYNCX CMYK
PD CMYK
VSYNCX CMYK
CMD
STS
FAIOCLK
CPSCLK
Features of the Controller
Table 2-4. Main Elements Explanation
Reference Function/Specification
IC101 Device: PowerPC 750FL-600
Clock speed: 600MHz
IC102 ASIC for memory control and video control
IC401 ASIC for I/O control
IC103 Interface between CPU and FMV
IC601 Pulse duration of video signal control IC
Controls frequency between FMV and
engine I/F.
IC402 Stores printer setting information, history,
and so on.
Capacity: 256 Kbyte
IC501 Clock generator
Controls emission noise from devices by
fluctuating frequency among them.
IC400 Panel control IC
IC502 Resets the system by detecting power-on,
power-off, and intermittent discontinuity.
Table 2-5. Signals Explanation
Function
System clock for CPU
A signal for getting DIMM information
Video clock
PWM clock
Video signal
Hsync signal
Video data
Vsync signal
Engine command signal
Engine status signal
System clock for FAIO
System clock for PCC
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