Ampro LittleBoard 800, Справочное руководство

Страница: 46 / 96

Chapter 3 Hardware
40 Reference Manual LittleBoard 800
Parallel Port Interface (J16)
Parallel port supports standard parallel, Bi-directional, ECP and EPP protocols. The LPC47B272
provides separate parallel port interface signals not shared with the floppy drive signals.
The parallel connector has 26 pins, 2 rows, odd/even, (1, 2), with 0.100” pin spacing.
Table 3-13. Parallel Interface Pin/Signal Descriptions (J16)
Pin # Signal In/Out Description
1 Strobe* Out Strobe* – This is an output signal used to strobe data into the printer.
I/O pin in ECP/EPP mode.
2 AFD* Out Auto Feed* – This is a request signal into the printer to
automatically feed one line after each line is printed.
3 PD0 I/O Parallel Port Data 0 – These pins (0 to 7) provide parallel port data.
4 ERR* Out Error* – This is a status output signal from the printer. A Low State
indicates an error condition on the printer.
5 PD1 I/O Parallel Port Data 1 – Refer to pin-3 for more information.
6 INIT* Out Initialize* – This signal used to Initialize printer. Output in standard
mode, I/O in ECP/EPP mode.
7 PD2 I/O Parallel Port Data 2 – Refer to pin-3 for more information.
8 SLIN Out Select In – This output signal is used to select the printer. I/O pin in
ECP/EPP mode.
9 PD3 I/O Parallel Port Data 3 – Refer to pin-3 for more information.
10, 12 GND Ground
11 PD4 I/O Parallel Port Data 4 – Refer to pin-3 for more information.
13 PD5 I/O Parallel Port Data 5 – Refer to pin-3 for more information.
14, 16 GND Ground
15 PD6 I/O Parallel Port Data 6 – Refer to pin-3 for more information.
17 PD7 I/O Parallel Port Data 7 – Refer to pin-3 for more information.
18, 20 GND Ground
19 ACK* In Acknowledge* – This printer output status indicates it has received
the data and is ready to accept new data if the signal state is Low.
21 BUSY In Busy – This printer output status indicates the printer is not ready to
accept data if the signal state is High.
22, 24 GND Ground
23 PE In Paper End – The printer output status indicates the printer is out of
paper if the signal state is High.
25 SLCT In Select – This printer output status indicates the printer is selected
and powered on if the signal state is high.
26 Key/NC Key - Not connected
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.