Epson DFX-9000
Revision B
Operating Principles
Circuit operation
81
Memory circuit control
As shown in the figure below, the memory circuit consists of three
memory devices: Flash memory, D-RAM, and F-RAM. Brief
descriptions for each memory device are given below.
Flash memory
16 Mbit of Flash memory are used to store the control program
(firmware) and character generator data.
D-RAM
16 Mbit of DRAM are used as the work area for data processing and
print image data generation.
F-RAM
4 Kbit of F-RAM are used to store mechanical adjustment parameters
and operational history information (error log, print operation log, etc.)
The CPU communicates with this chip through a two-line serial
interface (Data signal, Clock signal).
Figure 2-24. Memory control circuit block diagram
SoC ASIC
(LSI1)
XCE10EX
XCE8(XRAS1)
XCE7
FRAMDO/FRAMCLK
XUCAS,XLCAS
XWRL
XRD
D[15-0]
A[21-1]
Flash Memory
(IC1)
D-RAM
(IC3)
FRAM
ASIC
(LSI2)
Содержание DFX-9000
Страница 1: ...EPSONDFX 9000 Serial Impact Dot Matrix Printer SEDM04003 SERVICE MANUAL ...
Страница 8: ...C H A P T E R 1 PRODUCT DESCRIPTION ...
Страница 61: ...Epson DFX 9000 Revision B Product Description Dimensions and weight 54 ...
Страница 62: ...C H A P T E R 2 OPERATING PRINCIPLES ...
Страница 99: ...Epson DFX 9000 Revision B Operating Principles Circuit operation 92 ...
Страница 100: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 103: ...Epson DFX 9000 Revision B Troubleshooting Overview 96 3 1 3 Power on initialization sequence Main ...
Страница 104: ...Epson DFX 9000 Revision B Troubleshooting Overview 97 Mechanism initialization e e e e e ...
Страница 107: ...Epson DFX 9000 Revision B Troubleshooting Overview 100 PAPER FEEDING FF APG APPROACH ...
Страница 130: ...C H A P T E R 4 DISASSEMBLY AND ASSEMBLY ...
Страница 217: ...Epson DFX 9000 Revision B Disassembly and Assembly PULL TRACTOR UNIT L PULL TRACTOR UNIT R 210 ...
Страница 218: ...C H A P T E R 5 ADJUSTMENT ...
Страница 263: ...Epson DFX 9000 Revision B Adjustment Additional functions 256 ...
Страница 264: ...C H A P T E R 6 MAINTENANCE ...
Страница 286: ...C H A P T E R 7 APPENDIX ...
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Страница 324: ...EPSON DFX 9000 Revision B Appendix Component Layout 317 7 4 Component Layout ...
Страница 333: ...EPSON DFX 9000 Revision B Appendix Parts list 326 ...