ARX2412 Просмотр технического описания (PDF) - Aeroflex Corporation
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ARX2412 Datasheet PDF : 7 Pages
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SELF TEST COMPATABILITY
Self test may be accomplished using a wraparound
mode. This is done by switching TX DATA and TX
DATA through external multiplexers into RX DATA
and RX DATA. During this operation the transceiver
must be inhibited to avoid extraneous transmission
on the bus.
Decoder Operation
RECEIVER DATA (RX DATA) and (RX DATA)
Inputs from a compatible transceiver in
complementary serial biphase form.
RECEIVER BUSY (RCVR BUSY)
Outputs status of received information when data is
being transferred into the receiver data buffer
registers after a valid sync has been received. The
line will go high when busy and remain so until the
completion of the receive cycle.
RECEIVER SYNC TYPE
Outputs the sync field polarity of each input word
and is valid when (RCVR BUSY) signal is high. A
high indicates command or status sync; a low
indicates data sync.
VALID WORD
Transitions from high to low after receipt of a valid
sync, 16 data bits and an odd parity bit. Transition
back to high indicates that data is now available in
the three state output register.
Encoder Operation
OUTPUT SELECT (OSEL)
Logic low transfers input data into internal buffer
registers for processing.
SYNC SELECT
Prior to initiation of a transmission this line should
be set high. Retention of high establishes a
command or status sync and a low will produce a
data sync. The line should be brought low prior to
the high to low transition of the TRANSMITTER
BUSY line. For successive transmissions refer to
the Transmitter Section Timing Diagram.
ENCODER ENABLE
A logic high starts an encoder cycle. Retention of
high permits successive transmissions, which can
be avoided by transitioning, to low at least lµsec
before XMTR BUSY transition.
TRANSMITTER BUSY (XMTR BUSY)
High is busy indicating that data is being shifted
from the input data buffer to the encoder.
TRANSMIT DATA (TX DATA) and (TX DATA)
Output from the encoder in complementary serial
form. Positive and negative excursions represent
digital "1"s and "0"s.
SYSTEM ACKNOWLEDGE (SACK)
An input transistion from high to low enables
readout transfer from output registers onto the
parallel data output lines. Duration should be
approximately 2µsec. The leading edge transition
resets VALID WORD and VU INT to high, permitting
a new receive cycle.
VALID ADDRESS (VU INT)
Output goes low only upon validation of input word
and recognition of its internal terminal address.
COMMAND SYNC CLEAR:
This input low must be provided 2µsec after each
RECEIVER SYNC TYPE low to high transition, and
must be no wider than 1µsec.
Aeroflex Circuit Technology
4
SCD2412 REV C 10/19/98 Plainview NY (516) 694-6700
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