Figure 9. Format of Input Word to Digital Input Multiplexer from Universal Keyset Logic

Page Title: Figure 9. Format of Input Word to Digital Input Multiplexer from Universal Keyset Logic
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MIL-D-81347C(AS)

(6) Selectively set or reset each of four flip-flops. Each flip-

flop controls the illumination of a colored background message on a Matrix Readout switch not con-

trolled by (5). An output from each of the flip-flops shall be supplied to the Universal Keyset.

(7) Reset the storage registers for PRO's 7-9.

(8) Enable one of the test loops contained in the UKL.

Each UKL shall be self initializing; i.e. , when power is applied

to a UKL, no spurious data shall be transmitted to the DIM and the UKL shall be ready for normal

operation.

Test Loops - Test Loops shall be designed into each UKL. The

3.5.1.4.4.4

test loops shall permit the computer program to exercise a UKL and monitor the performance for

possible logic malfunctions. The test loops shall be comprehensive: i. e. , the test loops shall exercise

every logic element in a UKL in all of its functions insofar as possible. The test loop shall be utilized

for in-flight performance monitoring (IFPM) and diagnostic programs.

Interface Requirements - Refer to the functional flow diagram

3.5.1.4.4.5

for the UKL Subunit, Figure 12.

Format of Input Word to Digital Input Multiplexer from Universal

3.5.1.4.4.5.1

Keyset Logic - Refer to Figure 9.

Figure 9. Format of Input Word to Digital Input Multiplexer from Universal Keyset Logic

(1) Field A - Identifies test loop operation data, i.e. , if bit 7

is a logical "l", the data contained in the remainder of the input word to the computer is not the result

of a switch depression on the Universal Keyset but is due to test loop operation of the UKL by the com-

puter program.

(2) Field B - Identifies the switch depressed or contains the

data resulting from test loop operation.

NOTE

Bits 0-5 and 7 of the input word to the DIM form

bits 0-5 and 7 of the input word from the DIM to

the computer.

3.5.1.4.4.5.2

Format of Output Word to Universal Keyset from the Digital

Output Multiplexer - Refer to Figure 10.

(1) Field A - Specifies which one of the following operations is to

be performed.

(a) Field C is a message combination selection code for the

Matrix Readout switches and shall be stored in the appropriate register.

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