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PC87332 Datasheet(PDF) 75 Page - National Semiconductor (TI) |
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PC87332 Datasheet(HTML) 75 Page - National Semiconductor (TI) |
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75 / 98 page ![]() 70 Parallel Port (Continued) 3 Multiplexing parallel port signals with FDC signals on the PPM pins When the PPM is not enabled (bit 2 of FCR is 0) the parallel port signals are connected to the PPM pins When bit 2 of FCR is 1 and PNF e 1 the parallel port signals are connected to the PPM pins When bit 2 of FCR is 1 and PNF e 0 the FDC output signals are connected to the PPM pins Reading back the DTR or CTR returns their written val- ues and thus the parallel port module sees ‘‘cable not connected’’ Input signals assume their default values (STR register) BUSY e 1 PE e 0 SLCT e 0 ACK e 1 Table 7-6 shows the standard 25-pin D-type connector defi- nition for various parallel port operations TABLE 7-6 Parallel Port Pin Out Connector Chip SPP ECP Pin EPP Mode Pin PPM Mode Pin Pin No Pin No Mode Direction Direction and PNFe0 Direction 1 95 STB IO WRITE IO 2 94 PD0 IO PD0 IO INDEX I 3 93 PD1 IO PD1 IO TRK0 I 4 92 PD2 IO PD2 IO WP I 5 91 PD3 IO PD3 IO RDATA I 6 89 PD4 IO PD4 IO DSKCHG I 7 88 PD5 IO PD5 IO MSEN0 I 8 87 PD6 IO PD6 IO 9 86 PD7 IO PD7 IO MSEN1 I 10 85 ACK I ACK I DR1 O 11 84 BUSY I WAIT I MTR1 O 12 83 PE I PE I WDATA O 13 82 SLCT I SLCT I WGATE O 14 78 AFD IO DSTRB IO DENSEL O 15 79 ERR I ERR I HDSEL O 16 80 INIT IO INIT IO DIR O 17 81 SLIN IO ASTRB IO STEP O 75 |
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