ACT15530 datasheet(7/15 Pages) AEROFLEX

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Aeroflex Circuit Technology

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

Figure 10: Decoder Operation

Decoder Operation

The Decoder requires a single clock with a

frequency of 12 times the desired data rate

applied at the DECODER CLOCK input. The

Manchester II coded data can be presented to the

Decoder in one of two ways. The BIPOLAR

ONE and BIPOLAR ZERO inputs will accept

data from a comparator sensed transformer

coupled bus as specified in MIL-STD-1553. The

UNIPOLAR DATA input can only accept

non-inverted Manchester II coded data (e.g.from

BIPOLAR ZERO OUT of an Encoder).

The Decoder is free running and continuously

monitors its data input lines for a valid sync

character and two valid Manchester data bits to

start an output cycle.. When a valid sync is

recognized

x, the type of sync is indicated on

COMMAND/DATA SYNC output. if the sync

character was a command sync, this output will

go high

y and remain high for sixteen

DECODER

SHIFT

CLOCK

periods

otherwise it will remain low. The TAKE DATA

output will go high and remain high

y - z

while the Decoder is transmitting the decoded

data through SERIAL DATA OUT. The decoded

data available at SERIAL DATA OUT is in a

NRZ format. The DECODER SHIFT CLOCK is

provided so that the decoded bits can get shifted

into an external register on every low-to-high

transition of this clock

y - z.

After all sixteen decoded bits have been

transmitted

z the data is checked for odd parity.

A high on VALID WORD output

{ indicates a

successful reception of a word without any

Manchester or parity errors. At this time the

Decoder is looking for a new sync character to

start another output sequence.

At any time in the above sequence, a high

input

DECODER

RESET

during

low-to-high transition of DECODER SHIFT

CLOCK will abort transmission and initialize

the Decoder to start looking for a new sync

character.

Timing

Decoder

Shift Clock

Bipolar

One In

Bipolar

Zero In

Command/Data

Sync

(From Previous

Reception)

Take Data

Serial Data Out

Valid Word

Half Half

Sync Sync

1 2

16 17 18 19

15 14 13 12 11 10

2nd

1st

15 14 13 12 11 10

15 14 13 12

Undefined

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