Ampro Corporation Littleboard 550 Parallel Port Interface J15, Pin # Signal In/Out Description

Chapter 3 Hardware

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	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	AUTOFDX*	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 – This pin (0 to 7) provides parallel port data
			signals.
4	ERR*	Out	Error – This printer output status indicates an error condition on the
			printer if the signal state is Low.
5	PD1	I/O	Parallel Port Data 1 – Refer to pin 3 for more information.
6	INIT*	Out	Initialize * – This signal is 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	SLCTIN	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	GND		Ground
11	PD4	I/O	Parallel Port Data 4 – Refer to pin 3 for more information.
12	GND		Ground
13	PD5	I/O	Parallel Port Data 5 – Refer to pin 3 for more information.
14	GND		Ground
15	PD6	I/O	Parallel Port Data 6 – Refer to pin 3 for more information.
16	GND		Ground
17	PD7	I/O	Parallel Port Data 7 – Refer to pin 3 for more information.
18	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.
20	GND		Ground
21	BUSY	In	Busy – This printer output status indicates the printer is not ready to
			accept data if the signal state is High.
22	GND		Ground
23	PE	In	Paper End – This printer output status indicates the printer is out of
			paper if the signal state is High.
24	GND		Ground
25	SLCT	In	Select – This printer output status indicates the printer is selected and
			powered on if the signal state is High.
26	GND		Ground

Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

42 Reference Manual LittleBoard 550