CHAPTER II -5
(8)
Parallel I/O
<Data receive Mode>
There are two modes in this unit. One is the CPU receive mode and the other is the
DMA receive mode. In the CPU receive 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 it to the DRAM directly.
90 µsec
STROBE
BUSY
ACK
STROBE
BUSY
ACK
0.5 µsec
0.5 µsec
1.5 µsec
CPU Receive Mode
DMA Receive Mode
BUSY goes HIGH at the falling edge of the STROBE signal. The data (8 bits) from
the PC is latched into the data buffer at the rising edge of the STROBE signal. The
pulse width of ACK varies according to the speed MODE as shown above. BUSY
goes LOW on the rising edge of ACK.
<IEEE1284 support>
This supports the IEEE1284 data transfer with the following mode.
Nibble
mode
Byte mode
ECP
mode
(9)
Data extension
This circuit extents the compressed image data which are received from the PC, and
writes the bit map data to the FIFO.
(10)
Software support
Supports 16 x 16 rotation, bit expansion, bit search, and decimal point conversion.
(11)
EEPROM I/O
One output port and one I/O port are assigned.
Summary of Contents for HL HL-1060
Page 1: ...SERVICE MANUAL MODEL HL 1060 R LASER PRINTER ...
Page 24: ...CHAPTER II 8 1 3 5 DRAM Four 4Mbit DRAM x 8bit are used as the printer memory Fig 2 7 ...
Page 28: ...CHAPTER II 12 1 3 11 Engine I O Fig 2 13 shows the engine interface circuit Fig 2 13 ...
Page 96: ...Appendix 3 Main PCB Circuit Diagram 1 4 CODE UK3400000 B48K246CIR NAME V 3 ...
Page 97: ...Appendix 4 Main PCB Circuit Diagram 2 4 CODE UK3400000 B48K246CIR NAME V 4 ...
Page 98: ...Appendix 5 Main PCB Circuit Diagram 3 4 CODE UK3400000 B48K246CIR NAME V 5 ...
Page 99: ...Appendix 6 Main PCB Circuit Diagram 4 4 CODE UK3400000 B48K246CIR NAME V 6 ...
Page 100: ...Appendix 7 Driver PCB Circuit Diagram CODE UK3634000 B48K280CIR NAME V 7 ...
Page 105: ...Appendix 12 SR PCB Circuit Diagram CODE UK3653000 B48K284CIR NAME V 12 ...
