ACT15530PI datasheet(6/15 Pages) AEROFLEX

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Aeroflex Circuit Technology

SCD15530 REV B 7/28/99 Plainview NY (516) 694-6700

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

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

15 16 17 18

15 14 13 12

Sync Sync

15 14 13 12 11

Bipolar

Zero Out

Bipolar

One Out

Encoder

Shift Clock

Don’t Care

Valid

1st

2nd

15 14 13 12 11

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