
R51
40672201TH Rev. 4
A3 - 2
A3.1.2
R51 Circuit Diagram (Page 2/12)
1.
Block diagram
The circuit diagram shown on page 2/12 consists of Flash memory, DRAM, Real time
clock IC and Back up battery circuit.
Figure A3.1.2 shows the block diagram of Flash memory, DRAM and Real time clock.
2.
Function
1)
Flash memory (FLS)
Flash memory (electrically erasable and programmable device) is used for the
main software program, which is stored in EP-ROM of the current OKIFAX. Other
than the function of
EP-ROM, Flash memory is also used for the user data
area instead of SRAM chips.
•
1M Byte Flash memory x 1 (FLS)
Used for work area, report recording etc.
2)
DRAM
RAM2: 2MB (x16) and RAM3: 0.5MB (x16)
•
Used as follows:
Picture memory for the ECM send/receive mode.
Picture memory for the memory transmission mode.
Picture memory for the retransmission mode.
Picture memory for the reception in memory.
Editing for report printing.
3)
Back-up battery circuit
The non-rechargable lithium battery supplies voltage to a real-time clock IC at AC
main interruption.
4)
Real-time clock IC (IC3)
IC3 is a real-time clock IC used as a timepiece to display the data and time in year,
month, day, hour, minute, and second units. Its input/output signals are the 4-bit
data bus (D0 - D3), 4-bit address bus (A1 - A4) and the control signals, RTCCS,
MDMRD-N and MDWR-N which perform a CPU-controlled read operation (M/D/Y
H:M, Data read) and write operation (M/D/Y H:M, Data setting).
Содержание OKIOFFICE84
Страница 7: ...40672201TH Rev 4 CHAPTER 1 GENERAL INFORMATION...
Страница 44: ...40672201TH Rev 4 CHAPTER 2 INSTALLATION PROCEDURE...
Страница 120: ...40672201TH Rev 4 CHAPTER 3 BRIEF TECHNICAL DESCRIPTION...
Страница 128: ...40672201TH Rev 4 CHAPTER 4 MECHANICAL DISASSEMBLY AND REASSEMBLY...
Страница 133: ...4 5 40672201TH Rev 4 Appearance of the OKIOFFICE84 OKIFAX 4500 FX051 CP4 Fig 01...
Страница 155: ...40672201TH Rev 4 CHAPTER 5 ADJUSTMENTS...
Страница 159: ...40672201TH Rev 4 CHAPTER 6 CLEANING AND MAINTENANCE...
Страница 187: ...40672201TH Rev 4 CHAPTER 7 TROUBLESHOOTING AND REPAIR FOR OKIOFFICE84 OKIFAX 4500...
Страница 232: ...40672201TH Rev 4 CHAPTER 8 DIPSWITCHS SETTING TABLES...
Страница 254: ...40672201TH Rev 4 Appendix A PC Board Descriptions and Operation Second Edition December 1998 Oki Data Corporation...
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Страница 435: ...40672201TH Rev 4 Appendix F PC Loading Second Edition December 1998 Oki Data Corporation...
Страница 436: ...40672201TH Rev 4 FX 051 SYSTEM SPECIFICATION PC LOADING PART Ver 00 11 Oki Data Confidential...
Страница 448: ...40672201TH Rev 4 Appendix G RMCS SYSTEM MANUAL For Model 30 Second Edition December 1998 Oki Data Corporation...
Страница 473: ...40672201TH Rev 4 H 18 Figure 2 1 IC16 Pin 77 IC16 Pin 78 IC16 Pin 79 IC16 Pin 80...
Страница 481: ...40672201TH Rev 4 Appendix I FAX2NET FUNCTION First Edition October 1999 Oki Data Corporation...