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Chapter 3
Parallel Port Interface (J15)
Parallel port supports standard parallel, Bi-directional, ECP and EPP protocols. The VIA Southbridge
provides the parallel port interface signals.
Table 3-13. Parallel Interface Pin/Signal Descriptions (J15)
Pin # Signal
1
Strobe*
2
AUTOFDX*
3
PD0
4
ERR*
5
PD1
6
INIT*
7
PD2
8
SLCTIN
9
PD3
10
GND
11
PD4
12
GND
13
PD5
14
GND
15
PD6
16
GND
17
PD7
18
GND
19
ACK*
20
GND
21
BUSY
22
GND
23
PE
LittleBoard 700
In/Out Description
Out
Strobe* – This is an output signal used to strobe data into the
printer. I/O pin in ECP/EPP mode.
Out
Auto Feed * – This is a request signal into the printer to
automatically feed one line after each line is printed.
I/O
Parallel Port Data 0 – These signals (0 to 7) provide the parallel
port data signals
Out
Error – This is a status output signal from the printer. A Low
State indicates an error condition on the printer.
I/O
Parallel Port Data 1 – These signals (0 to 7) provide the parallel
port data signals
Out
Initialize * – This signal used to Initialize printer. Output in
standard mode, I/O in ECP/EPP mode.
I/O
Parallel Port Data 2 – These signals (0 to 7) provide the parallel
port data signals
Out
Select In – This output signal is used to select the printer. I/O pin
in ECP/EPP mode.
I/O
Parallel Port Data 3 – These signals (0 to 7) provide the parallel
port data signals
Digital Ground
I/O
Parallel Port Data 4 – These signals (0 to 7) provide the parallel
port data signals
Digital Ground
I/O
Parallel Port Data 5 – These signals (0 to 7) provide the parallel
port data signals
Digital Ground
I/O
Parallel Port Data 6 – These signals (0 to 7) provide the parallel
port data signals
Digital Ground
I/O
Parallel Port Data 7 – These signals (0 to 7) provide the parallel
port data signals
Digital Ground
In
Acknowledge * – This is a status output signal from the printer. A
Low State indicates it has received the data and is ready to accept
new data.
Digital Ground
In
Busy – This is a Status output signal from the printer. A High
State indicates the printer is not ready to accept data.
Digital Ground
In
Paper End – This is a status output signal from the printer. A High
State indicates it is out of paper.
Reference Manual
Hardware
39
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