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AN-5010 Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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AN-5010 Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 10 page 5 www.fairchildsemi.com Application of 1284 Transceivers (Continued) Peripheral EPP Application The EPP advanced mode connection scheme and signals are shown in Figure 3. The recommended 1284-C con- nector is shown at the peripheral in this application. Figure 6 depicts the connection diagram for this application and indicates the commonly used 1284-A connector at the host PC. See Figure 7 for viewing connections for the IEEE rec- ommended 1284-C connector. This is a connection dia- gram for both the host and peripheral sides. It should be noted that there is no IEEE 1284 signal desig- nated for driving the direction pin on 1284-compliant trans- ceivers. The direction signal for bidirectional data flow control is generally programmed and driven from a circuit block referred to as the controller. The peripheral controller function is customarily implemented through use of a microprocessor or an ASIC (application specific integrated circuit) on the peripheral. On the host-side, the controller is usually a single chip multi-functional device that may incor- porate UARTs, disk and keyboard, and 1284 interface con- troller functions. One such device is National Semiconductor’s Super I/O Sidewinder PC87323VF. FIGURE 3. Peripheral Side Application — Extended Parallel Port Signals |
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