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HD-15531 Datasheet(PDF) 9 Page - Intersil Corporation |
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HD-15531 Datasheet(HTML) 9 Page - Intersil Corporation |
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9 / 16 page  9 MIL-STD-1553 The 1553 Standard defines a time division multiplexed data bus for application within aircraft. The bus is defined to be bipolar, and encoded in a Manchester II format, so no DC component appears on the bus. This allows transformer cou- pling and excellent isolation among systems and their envi- ronment. The HD-15531 supports the full bipolar configuration, assuming a bus driver configuration similar to that in Figure 1. Bipolar inputs from the bus, like Figure 2, are also accommodated. The signaling format in MIL-STD-1553 is specified on the assumption that the network of 32 or fewer terminals are controlled by a central control unit by means of Command- Words, and Data. Terminals respond with Status Words, and Data. Each word is preceded by a synchronizing pulse, and followed by parity bit, occupying a total of 20 µs. The word formats are shown in Figure 4. The special abbreviations are as follows: P Parity, which is defined to be odd, taken across all 17 bits. R/T Receive on logical zero, transmit on ONE. ME Message Error if logical 1. TF Terminal Flag, if set, calls for controller to request self-test data. BIPOLAR ONE IN BIPOLAR ZERO IN LSB P SYNC MSB PARITY P COMMAND SYNC VALID WORD PARALLEL OUT VALID VALID FROM PREVIOUS RECEPTION FIGURE 5. DECODER TIMING FIGURE 6. SIMPLIFIED MIL-STD-1553 DRIVER FIGURE 7. SIMPLIFIED MIL-STD-1553 RECEIVER “0” “1” BUS + - + - “1” “0” “1” REF “0” REF HD-15531 |
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