2.3.20.1 Signal Description – Parallel Port Connecter (PNT1)
The following signal description covers the signal definitions, when the parallel port is operated in standard centronic mode. The parallel port controller also supports the fast EPP and ECP modes.
| Signal |
| Signal Description | ||
| PD[7:0] |
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| Parallel data bus from PC board to printer. The data lines are able to operate in |
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| PS/2 compatible |
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| SLIN# |
| Output line for detection of printer selection. This pin is pulled high internally. | ||
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| SLCT |
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| An active high input on this pin indicates that the printer is selected. This pin is | |
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| pulled high internally. | ||
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| STB# |
| An active low output is used to latch the parallel data into the printer. This pin is | ||
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| pulled high internally. | |||
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| BUSY |
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| An active high input indicates that the printer is not ready to receive data. This pin | |
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| is pulled high internally. | ||
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| ACK# |
| An active low input on this pin indicates that the printer has received data and is | ||
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| ready to accept more data. This pin is pulled high internally. | |||
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| INIT# |
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| Output line for the printer initialization. This pin is pulled high internally. |
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| An active low output from this pin causes the printer to auto feed a line after a line | |
| AFD# |
| is printed. | ||
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| This pin is pulled high internally. | |
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| ERR# |
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| An active low input on this pin indicates that the printer has encountered an error | |
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| condition. This pin is pulled high internally. | ||
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| PE |
| An active high input on this pin indicates that the printer has detected the end of | ||
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| the paper. This pin is pulled high internally. | |||
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