II-4
(5)
Timers
The following timers are incorporated:
Timer 1
16-bit timer
Timer 2
10-bit timer
Timer 3
Watch-dog timer
(6)
FIFO
A 5,120-bit FIFO is incorporated. Data for one raster scan is transferred from the
RAM to the FIFO by DMA transmission and is output as serial video data. The
data cycle rate is 10.22 MHz.
(7)
CDCC parallel I/O
<Data receiving>
There are two modes in this unit. One is the CPU receiving mode and the other is
the DMA receiving mode. In the CPU receiving mode the CPU receives the
command data from the PC, and after the CPU is switched to the DMA mode, it
receives the image data and writes to the DRAM directly.
90 µsec
STROBE
BUSY
ACK
STROBE
BUSY
ACK
0.5 µsec
0.5 µsec
1.5 µsec
BUSY goes HIGH at the falling edge of STROBE. The data (8 bits) from the PC is
latched in the data buffer at the rising edge of STROBE. The pulse width of ACK
differs according to the speed MODE as shown above. BUSY goes LOW at the
rising edge of ACK.
<IEEE1284 support>
This supports the IEEE1284 data transfer with the following modes.
Nibble mode
Byte mode
(8)
Data expansion
This circuit expands the compressed image data received from the PC, and writes
the bit map data to the FIFO.
(9)
Software support
Supports 16 x 16 rotation, bit expansion and bit search.
CPU Receive Mode
DMA Receive Mode
Содержание HL-P2000
Страница 1: ......
Страница 27: ...II 8 1 3 8 Engine I O Fig 2 10 shows the engine interface circuit Fig 2 10 ...
Страница 69: ...III 28 4 PACKING Fig 3 48 Documents Accessory carton Pad Pad Printer Bag Carton Drum Unit ...
Страница 92: ...IV 23 4 4 Location of Feed Roller Shaft and Grounding Contacts Fig 4 7 Feed roller shaft For paper feed roller ...
Страница 115: ...Appendix 5 Main PCB Circuitry Diagram 1 3 CODE UK3981000 B512018 CIR 1 3 NAME A 6 ...
Страница 116: ...Appendix 6 Main PCB Circuitry Diagram 2 3 CODE UK3981000 B512018 CIR 2 3 NAME A 7 ...
Страница 117: ...Appendix 7 Main PCB Circuitry Diagram 3 3 CODE UK3981000 B512018 CIR 3 3 NAME A 8 ...
Страница 118: ...Appendix 8 Panel Sensor PCB Circuit Diagram CODE UK4010000 B48K303CIR NAME A 9 ...
Страница 119: ...Appendix 9 Scanner Panel PCB Circuit Diagram CODE UK3982000 B512019 CIR NAME A 10 ...
Страница 120: ...Appendix 10 Scanner Sensor PCB Circuit Diagram A 11 B512020 CIR CODE UK3983000 NAME ...
Страница 170: ......
Страница 249: ...APPENDIX A 9 HP LaserJet IIP EPSON FX 850 IBM Propritner XL EPSON FX 850 ...
Страница 260: ...Aug 98 84U007BE0 PARTS REFERENCE LIST MODEL MFC P2000 HL P2000 R LASER PRINTER ...