II-5
1.3.2
ASIC
The ASIC is composed of a Cell Based IC that contains the following functional blocks.
(1)
Oscillator circuit
Generates the main clock for the CPU.
(2)
Address decoder
Generates the CS signal for each device.
(3)
DRAM control
Generates the RAS, CAS, WE, OE and MA signals for the DRAM and controls the
refresh processing (CAS before RAS self-refreshing method).
(4)
Interrupt control
Interrupt levels:
Priority
High
10
Reserve interrupt 1 (for debug)
9
Watch Dog Timer
8
LSB EMPTY (for VDO FIFO)
7
Timer 1
6
USB
5
XIO interrupt (RS-100M) or MIO interrupt
4
BD (for engine check)
3
Reserve interrupt 2
2
CDCC
Low
1
Timer 2
Note:
All the interrupts can be masked.
The priority of level 7, 6, and 5 are changeable from the program.
(5)
Timers
The following timers are included:
Timer 1
32-bit timer
Timer 2
32-bit timer
Timer 3
Watch-dog timer
(6)
FIFO
A 10Kbit FIFO is included. Data for one raster is transferred from the RAM to the
FIFO by DMA transmission and is output as serial video data. The data cycle is
10.43mhz.
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Summary of Contents for HL-1070
Page 1: ...Download Free Service Manual and Resetter Printer at http printer1 blogspot com ...
Page 20: ...II 4 Fig 2 4 Download Free Service Manual and Resetter Printer at http printer1 blogspot com ...
Page 96: ...CODE UK3958 000 B48K302 1CIR NAME A 3 Appendix 3 Main PCB Circuit Diagram 1 5 ...
Page 97: ...CODE UK3958 000 B48K302 1CIR NAME A 4 Appendix 4 Main PCB Circuit Diagram 2 5 ...
Page 98: ...CODE UK3958 000 B48K302 1CIR NAME A 5 Appendix 5 Main PCB Circuit Diagram 3 5 ...
Page 99: ...CODE UK3958 000 B48K302 1CIR NAME A 6 Appendix 6 Main PCB Circuit Diagram 4 5 ...
Page 100: ...Appendix 7 Main PCB Circuit Diagram 5 5 CODE UK3958 000 B48K302 1CIR NAME A 7 ...
Page 101: ...Appendix 8 Driver PCB Circuit Diagram CODE UK3634000 B48K280CIR NAME A 8 ...
Page 106: ...Appendix 13 SR PCB Circuit Diagram CODE UK3653000 B48K284CIR NAME A 13 ...
Page 107: ...Apr 98 54U011BE0 PARTS REFERENCE LIST MODEL HL 1070 R LASER PRINTER ...
Page 241: ...APPENDIX A 11 HP LaserJet 6P EPSON FX 850 IBM Proprinter XL EPSON FX 850 PC 850 ...
