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Status Information From Computer via Digital Output Multiplexer |
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|  MIL-D-81347C(AS)
3.5.1.4.6.3.2
Timing for Input Data Words
(1) If a single status word changes (indicated by a permanent
change in voltage on one or more of the status' lines associated with the word), the Status Logic Subunit
shall raise the appropriate Enter line to the DIM and have status data available within 50 microseconds
after the status change.
(2) If a number of the status words change simultaneously, the
Enter line for the first status word shall be raised within 50 microseconds after the change. The Enter
line associated with each succeeding word shall be raised within 100 microseconds after the trailing
edge of the Channel Input Acknowledge signal for the previous word.
3.5.1.4.6.3.3
Status Information From Computer via Digital Output Multiplexer -
The Status Logic Subunit shall interpret the output word received from the DOM to perform one of the
following operations:
(1) Transmit any combination of the 1 to 5 status words, to the
computer via the DIM. When more than one word is requested, the words shall be transmitted in suc-
cession to the computer. The order of transmission of the words is not significant.
(2) Store 10 status bits for the Navigation System. The 10 status
bits are supplied as 10 lines to the Navigation System. Six lines shall drive relays and four lines shall
drive line receivers,
Self Initialization - The equipment shall be self-initializing.
3.5.1.4.6.3.4
When power is applied to the Status Logic subunit, no spurious data shall be transmitted to the computer
and the subunit shall be ready for normal operation. When DC voltages and data to the subunit have sta-
bilized, the subunit shall transmit either an interrupt on Channel 11 followed by five normal input status
words to the computer via DIM Channel 7 (status words 1 through 5), or, five status words with no
channel 11 interrupt.
Interface Requirements - Refer to the functional flow diagram for
3.5.1.4.6.4
the Status Logic Subunit (Figure 23).
Format of Input Word to Digital Input Multiplexer from Status
3.5.1.4.6.4.1
Logic for SAD Status Channel - Refer to Figure 22.
Format of Input Words to Digital Input -Multiplexer from Status
3.5.1.4.6.4.2
Loic - The five status words to the Digital Input Multiplexer from the Status Logic are shown in
Figures 24 through 28.
Format of Output Words from the Digital Output Multiplexer to
3.5.1.4.6.4.3
the Status Logic Subunit - The Output Words are shown in Figures 29, 30 and 31.
Status Logic Subunit to Digital Input Multiplexer - Communications
3.5.1.4.6.4.4
between the Logic Subunit and the DIM shall be in accordance with 3.5.1.4.1.
Digital Output Multiplexer to Status Logic Subunit - Communications
3.5. 1.4.6.4.5
between the Status Logic Subunit and the DOM shall be in accordance with 3.5.1.4.2.
Figure 22. Format of Input Word to Digital Input Multiplexer from Status Logic for
SAD Status Channel
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