2.4 CDJ-2330 MAIN PROCESSOR
2.4.1
Composition
The CDJ-2330 Main Processor is composed of following section:
1) Demodulator section
2) CPU section
3) Printer section
2.4.2 Description of operation
1)
Demodulator section
Demodulator section is composed of DSP(Digital Signal Processor), Codec
and other IC. A part of input signal from FS IN (CMN-2330) is fed to the
Codec IC(IC13) and DSP(IC2).
This circuit is the Digital Signal Processing IC which generates 0V when the
input frequency is 1785Hz and +5V when the input frequency is 1615Hz.
2)
CPU Section
CPU section is composed of CPU(Central Processing Unit), Oscillator, ROM
(Read Only Memory) , RAM(Random Access Memory), EEPROM(Electrically
Erasable Programmable Read Only Memory), PLD(Programmable Logic
Device) and Driver.
The H8 CPU (IC1) processes the signals received and demodulated by DSP
according to the program stored in IC3 (ROM) to transmit print data to the
Printer. At the same time, the H8 supervises the state of the switch, and
controls the state of the system.
The Oscillator (IC17) generates the clock signal to operate the CPU.
The Address Decoder (IC15) selects IC’s according to the address data given
by the CPU. The ROM (IC3) has the size of 64kB, and saves a program that
controls the system. The RAM (IC7) has the size of 32kB.
It works as the buffer memory to store receiving data, and provides a work
area. Necessary data including the information sent from the switch is
preserved by the back-up battery for more than 24 hours after power-off.
Timer in the CPU(IC1) generates interrupt signal for bit synchronization
processing, ALARM signal, and self-diagnostic test signal.
The Output port in the CPU(IC1) outputs print data and control signal to
the Printer, scan signal to the switch, and control signal to the DSP.
The Output port in the CPU outputs control signal to the led.
The input port inputs switch signal, state of the Printer and Paper-Out
detection information.
3)
Printer section
Printer section is composed of Driver(IC12), Printer(PRT1) and other IC.
The driver(IC2) receives print data from CPU(IC1), and outputs signal to
the Printer(PRT1).
The Printer(PRT1) prints out the receiving data, status etc.
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