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Program Control Instruction Format |
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|  MIL-N-81497A(AS)
Average Multiply Time - 200 SEC maximum
3.5.5.9.2
Program Control Instruction Format - The arithmetic
3.5.5.10
and control logic shall execute the Computer, Navigation program
using 5 bit byte instructions. Instructions shall be 1, 2, 3, or 4
bytes in length.
Input/Output (I/O)- The 1/0 section shall handle
3.5.5.11
pulse train inputs and outputs, discretes inputs and outputs, serial
and parallel inputs and output channels in addition to controlling
analog to digital (A/D) and digital to analog (D/A) conversions. The
Computer, Navigation I/0 shall consist of, including A/D and D/A con-
version, only solid state components. All inputs and outputs shall
be conditioned in the 1/0 section of the computer for processing with
the Computer, Navigation or transfer to other equipments with the
exception of the serial output data to the external central data pro-
cessor. Data to the central data processor shall be shifted directly
out of Computer, Navigation Memory.
A/D and D/A Converters - The A/D and D/A converters
3.5.5.11.1
shall be asynchronous peripheral devices using the 26V, 400 Hz, single
phase excitation as reference.
Resolver A/D conversion shall be accomplished
(1)
in two phases, octant conversion phase and
angle magnitude phase. The conversion register
shall have 13 bits of data. The first 3 bits
shall contain octant information and the
remaining 10 bits shall contain a linear
The A/D
representation of tan or cot
converter shall contain 3 analog data input
channels plus 2 test channels.
D/A Conversion - The D/A conversion shall
(2)
output analog signals in the form of 3 wire
synchro signals from a 13 bit D/A register
with output data continuously available.
The converter shall accept 10 bits of tan
or cot information and 3 bits of octant
information for conversion.
Conversion Rates -
(3)
(a) The conversion rate of each channel shall
occur within three cycles of the 400 Hz
excitation reference. The conversion time
following a computer command shall not
exceed 10 MS per input channel.
Interface - The Computer, Navigation shall provide
3.5.5.12
for the following input and output signals:
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