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MIL-N-81207A(AS)
digital, serial form to interface with sundry computers used in
Navy aircraft.  The interface, computer to TACAN, is composed of
the four signals; READ, ADDRESS, DATA OUT, and SHIFT CLOCKS.  The
READ line is a single wire discrete.  The ADDRESS signal is
composed of two single wire discretes.  The SHIFT CLOCKS are
received by the TACAN as a differential output from the computer.
The DATA OUT shall be received by a double ended receiver.
The READ line shall be simplexed to the TACAN.  The ADDRESS lines
shall be valid a minimum of 0.5 microseconds prior to the raising
of the READ line.  The READ and ADDRESS lines shall be valid a
minimum of 0.5 microsecond prior to the transmission of SHIFT
CLOCKS .  A maximum of 200 nanoseconds after the READ line is
brought up, bit #l of data shall be available on the DATA OUT
lines.  The TACAN output register shall then be shifted once on
each of the 20 positive (voltage) transitions of the SHIFT CLOCK
provided by the Computer.
The data will be received from TACAN serially at a rate of 5 kHz
to 1 MHz.  At a minimum of one microsecond after the 20th SHIFT
CLOCK pulse from the computer, the READ line will be dropped.  The
raising of the READ line shall then be inhibited for a minimum of
10 microseconds after it has been dropped.  Minimum and Maximum
times shall be measured between the 90% point of the previous
transition and the 10% point of the subsequent transition.
43.

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