ACT15530CFB AEROFLEX [Aeroflex Circuit Technology], ACT15530CFB Datasheet - Page 6

• Manufacturer Part Number: ACT15530CFB
• Description: CMOS Manchester Encoder / Decoder
• Manufacturer: AEROFLEX [Aeroflex Circuit Technology]

Aeroflex Circuit Technology
Encoder Operation
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.
ENCODER ENABLE is high during a failing
edge of ENCODER SHIFT CLOCK
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
Encoder is ready to accept data, the SEND
DATA output will go high and remain high for
sixteen ENCODER SHIFT CLOCK periods
The Encoder requires a single clock with a
The
Encoder's
Serial Data In
Sync Select
Send Clock
Shift Clock
Send Data
Zero Out
Encoder
Encoder
One Out
Bipolar
Bipolar
Timing
Enable
cycle
Valid
1
begins
y
2
Sync Sync
. When the
Figure 9: Encoder Operation
Half Half
1st
0 1
x
2nd
. This
when
3
2
Don’t Care
Don’t Care
15 14 13 12
z
15 14 13 12 11
15 14 13 12 11
3
.
4
6
5
During these sixteen periods the data should be
clocked into the SERIAL DATA input with
every low-high transition of the ENCODER
SHIFT CLOCK
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
|
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.
6
. At any time a low in OUTPUT INHIBIT
11
7
10
3
15 16 17 18
3
3
2
2 1
2 1
1
z
0
-
SCD15530 REV B 7/28/99 Plainview NY [phone]
0
0
4
{
. After the sync and the
19
P
P
5