Sharp AR-P13 Service Manual page 100

1. Print Data Flow
The flow of print data sent from computers is presented in this chapter classified by the ways of connection.
1.1 Local (Parallel) Connection
Printer Board
Not used
PowerPC 603e
Program
ROM SIMM
8Mbyte
3
U51,52
SDRAM
16Mbyte
(1) The Parallel Controller (U26) receives the print data and command signals transmitted through the Parallel Interface (J10)
from a computer.
(2) The print data and command signals are transmitted to the PowerPC 603e (U24) by Double Finger (U25).
(3) The PowerPC 603e processes and analyzes the print data relying on the command signals and the print settings saved
in EEPROM (U7). When printing with Internal Font, the font data are retrieved from Program ROM SIMM.
The analyzed print data are transmitted and saved in SDRAM (U51,52) by Double Finger.
(4) The saved data are transmitted to the RECTOR (U13) by Double Finger.
(5) The RECTOR (U13) compresses the print data. The compressed data are transmitted to PLD (U3) by Double Finger.
(6) PLD transmits the print data via PCI I/F Controller (U2) to the System Board of the machine in DMA through the Engine
Interface (J1,5). The System Board comes into operation to activate the Printer Engine and the transmitted print data are
printed.
U7
EEPROM
4Kbit
2
U24
4 5
U13
RECTOR
U26
PARALLEL
CONTROLLER
U25
DOUBLE FINGER
U2
6
U3
PCI
PLD I/F
Controller
3-1
1
Computer
AR-650
System
Board
Printer
Engine