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|  MIL-D-81347C(AS)
External Function) and allow the operator to simulate these data and control signals. The operator
shall be able to select either single step or continuous mode of simulated operation. The single step
mode shall allow the operator to transmit a single control signal of minimum duration (Output Acknow-
ledge or External Function) each time a particular switch is depressed. If the continuous mode is
selected, a control signal of minimum duration shall be transmitted each time the output peripheral
raises the associated control line (Output Data Request or External Function Request). A switch/
indicator shall be provided for each data bit of the computer word which can be simulated by the oper -
ator. If the operator wishes a particular data bit to be a logical "l", he may depress the switch/
indicator associated with the data bit; the indicator will light, verifying that the bit is in the logical
"1" state. The data bit shall continue to be transmitted as a logical "1" until the operator depresses
the Clear switch. The Clear switch shall reset all data bits to the logical "O" state.
(7) Provide any additional maintenance functions described in the
detailed requirements for the logic unit, or which may be needed to accomplish the Maintenance
Control Panel Tests.
3.5.1.4.9.3
Interface Requirements
Input
3.5.1.4.9.3.1
3.5.1.4.9.3.1.1
Subunit to Maintenance Control Panel Logic- Each subunit shall
v e r s f o r a l l i n p u t c o n t r o l a n d d a t a l i n e s . In addition, the input data and control lines (prior
to the control and data line drivers) shall be provided by the subunits to the MCPL for monitoring.
Monitoring shall be in the form of indicators.
All input communications to the computer shall be in accordance
with Appendix 1.
Computer to Maintenance Control Panel Logic - The MCPL shall
3.5.1.4.9.3.1.2
provide the input amplifiers for Input Acknowledge and Interrupt Enable for each subunit which is as-
signed an input channel. Data shall be provided to each subunit for both control lines.
output
3.5.1.4.9.3.2
Maintenance Control Panel Logic to Subunits - The MCPL shall
3.5.1.4.9.3.2.1
provide to each subunit, buffered (with input amplifiers) data signals for the output control and data
lines associated with that subunit. (Input amplifiers are described in Appendix II. )
In the off-line or maintenance mode, the MCPL shall provide to
the selected subunit, the data and control lines which simulate the signals supplied by the computer.
(Simulated control line signals shall be approximately the same pulse width as computer control line
signals. )
Computer to Maintenance Control Panel Logic - Signal levels
3.5.1.4.9.3.2.2
between the computer and the MCPL shall be in accordance with Appendix 1. All output communica-
tions between the computer and each subunit hall be via the MCPL.
Power Monitor - The MCPL shall monitor the output voltages
3.5.1 .4.9.3.3
from the power supply. When power is out-of-tolerance, not due to input power out-of-tolerance, a
Power Valid word shall be transmitted to the computer using an interrupt. This word small be sent
with every change of status.
Power Monitor Word Formats - The power monitoring word
3.5.1.4.9.3.3.1
formats for the four logic units are shown in Figure 53.
3.5.1.4.9.3.3.2
Computer Channel Assignments
Logic
Unit
1
-
Channel
0
Logic
Unit
2
-
Channel
8
Logic
Unit
3
-
Channel
7
-
Channel
13
Logic
Unit
4
94
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