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Page Title:
In-Flight Performance Monitoring Channels |
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|  MIL-D-81347C(AS)
(4) The DMS shall be self-initializing, i.e. , when power is
applied to the DMS, no logic 1's shall be transmitted on the DMS Control lines to the computer and the
DMS shall be ready for normal operation.
(5) Provisions shall be made for the computer or the operator
using the MCP to initialize the DMS. On receipt of the Master Clear EF. 3.5.4.4.1.6. 2(3), initializing
signals shall be generated to the DMS, the ADL, and any internal (to Logic Unit 4) interface that may
be added to a DMS spare channel. Following these initializing signals, the subunits shall be ready for
normal operation.
Test Loops
3.5.4.4.1.4
In-Flight Performance Monitoring Channels - One DMS input
3.5.4.4.1.4.1
channel and one DMS output channel shall be designated as test channels. The setting of request lines
on these channels shall be controlled by the Computer program. The computer input data lines in the
IDR/IA data transfer mode shall be controlled directly by the computer output data lines. The DMS
shall transmit data from this channel to the computer and from the computer to this channel in the
same manner as it would for any other DMS channel. This loop operation, computer to DMS to com -
puter, will permit the computer to automatically monitor the performance of the DMS. In addition, it
will allow the computer to check a full 30 bit interface through a minimum amount of peripheral hard-
ware.
Diagnostic Test Loops - Provisions may be made in the DMS
3.5.4.4.1.4.2
for additional test loops to be used in diagnosing malfunctions in the DMS and in those DMS-to-
peripheral interfaces located within Logic Unit 4.
DMS Instruction Codes - The DMS Instruction Codes are four
3.5.4.4.1.5
bit positions (27 through 24) of the DMS Instruction E F, Word Format 3.5.4.4.1.6. 2(4). The follow-
ing describes the instruction functions.
DMS INSTRUCTION CODE
BINARY
OCTAL
27
26
25
24
No Op - No operation performed by the DMS.
00
0
0
0
0
Select Input - The DMS shall connect an input peripheral per
01
0
0
0
1
Field H to the computer input control and data lines. This
selected peripheral shall be able to input to the computer via
the IDR/IA data transfer mode.
Select Output - The DMS shall connect an output peripheral per
02
0
0
1
0
Field G to the computer output control lines. This selected
peripheral shall be able to receive data from the computer via
the ODR/OA and the EFR/EF data transfer modes.
Select Input and Output - The DMS shall perform both a Select
03
0
0
1
1
Input and a Select Output as described previously.
Enable Peripheral EI - The DMS shall enable. per Field F.
04
0
1
0
0
from one to eight of the input peripherals serviced by the DMS,
to access the computer via External Interrupt. This access
shall be independent of peripheral select code. The access
shall be via an External Interrupt, Word Format
3.5.4.4.1.6.1(2), generated by the DMS with a three-bit code
identifying the peripheral raising the EI and one bit identifying
this type of EI The remaining 26 bits of the word shall be
transferred directly from the peripheral to the computer.
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