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ACT15530 Datasheet(PDF) 6 Page - Aeroflex Circuit Technology |
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ACT15530 Datasheet(HTML) 6 Page - Aeroflex Circuit Technology |
6 / 15 page Aeroflex Circuit Technology SCD15530 REV B 7/28/99 Plainview NY (516) 694-6700 6 Encoder Operation The Encoder requires a single clock with a frequency of twice the desired data rate applied at the SEND CLOCK input. An auxiliary divide by six counter is provided on chip which can be utilised to produce the SEND CLOCK by dividing the DECODER CLOCK. The Encoder's cycle begins when ENCODER ENABLE is high during a failing edge of ENCODER SHIFT CLOCK x. This cycle lasts for one word length or twenty ENCODER SHIFT CLOCK periods. At the next low-to-high transition of the ENCODER SHIFT CLOCK, a high at SYNC SELECT input actuates a command sync or a low will produce a data sync for that word y. When the Encoder is ready to accept data, the SEND DATA output will go high and remain high for sixteen ENCODER SHIFT CLOCK periods z. During these sixteen periods the data should be clocked into the SERIAL DATA input with every low-high transition of the ENCODER SHIFT CLOCK z - {. After the sync and the Manchester II coded data are chip transmitted through the BIPOLAR ONE and BIPOLAR ZERO outputs, the Encoder adds on an additional bit which is the parity for that word |. At any time a low in OUTPUT INHIBIT input will force both bipolar outputs to a high state but will not affect the Encoder in any other way. To abort the Encoder transmission a positive pulse must be applied at MASTER RESET. Anytime after or during this pulse, a low to high transition on SEND CLOCK clears the internal counters and initializes the Encoder for a new word. Figure 9: Encoder Operation Timing Send Clock Encoder Enable Send Data Sync Select Serial Data In Half Half 0 1 2 3 4 5 6 7 15 16 17 18 15 14 13 12 10 2 1 0 3 1 2 4 5 3 11 Sync Sync 15 14 13 12 11 2 1 0 P 3 19 Bipolar Zero Out Bipolar One Out Encoder Shift Clock Don’t Care Don’t Care Valid 1st 2nd 15 14 13 12 11 2 1 0 P 3 |
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