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|  MIL-D-81347C(AS)
receipt of an End of Data (EOD) code from the computer (last word in the display buffer). It shall re-
sume requests for data upon receipt of the 40 Hz sync signal from the MTL via the MCP. The time
between requests for sequential output data shall be in accordance with the timing constraints in the
following table. Computer output timing shall be as described for Normal Output Data in Appendix I.
MAXlMUM OPERATION TIMES PER WORD
Execution Time
Operation
24 sec nominal
Positioning
550 sec maximum
Circle
550 sec maximum
Vector
380 sec maximum
Character (regardless of mode)
5 sec maximum
End of Data
5 sec maximum
No Operation
Operating Requirements - The following is a description of the
3.5.3.4.2.3
operational requirements of the PDL.
Data Transmission - The PDL shall indicate its readiness to
3.5.3.4.2.3.1
accept data by means of the ODR line being set. Data is of several categories and thus has unique
timing controls for the various modes of operation. Typically, data shall be transmitted in two
sequential words:
(1) First Transmission -
(a) Four bits denoting Set Position Mode
(b) Two eight-bit fields containing X and Y positioning
(2) Second Transmission -
(a) Four bits denoting Operation Mode
(b) Two nine-bit fields containing Command Word Data
Function Codes - There are four general types of Function Codes:
3.5.3.4.2.3.2
(1) Set Position Word - Two eight-bit one's complement fields
for X and Y position.
(2) Circle Plot Word - Two eight-bit fields denoting the circle
radius.
(3) Vector or Azimuth Vector Word - Two nine-bit one's comple-
ment field X and Y vector components.
(4) Character Plot Word - Two six-bit fields employed to specify
two characters.
Diagnostics - The PDL shall provide diagnostic data which shall
3.5.3.4.2.3.3
be initiated by a Diagnostic Instruction word from the computer via the MTL.
Character Generator - The character generator shall utilize the
3.5.3.4.2.3.4
dot method to generate 47 possible characters. A six-bit counter shall generate a pattern of 8 by 8
dot positions through the use of two three-bit D/A converters. The six-bit counter also generates
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