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Page Title:
Input/Output Signal Characteristics |
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|  MIL-D-81347C(AS)
(12) Vector Slope - The MPD Logic shall transmit to the MPD a
nine-bit parallel word which contains the vector's major axis length.
(13) Major Axis - The MPD Logic shall transmit to the MPD a
signal that informs the MPD whether the X or Y axis is the major axis of the conic.
(14) X and Y Sign - The MPD Logic shall transmit to the MPD
two parallel bits which inform the MPD of the sign of the X and Y axis in a vector figure.
(15) Sweep Enable - The MPD Logic shall transmit to the MPD
an enable signal used to release the sweep generator in the MPD.
(16) Sync Signals - The MPD Logic shall transmit to the MPD
two sync signals.
(a) Frame sync
(b) Word sync
Function Generator - Signals between the MPD Logic and
3.5.3.4.1.4.1.4
Function Generator shall be as follows:
(1) Conic Words - The MPD Logic shall transmit to the
Function Generator two 20-bit parallel words. These words shall define to the Function Generator
the specific ellipse, circle, or straight line to be displayed on the MPD.
(2) Function Generator Test - The MPD Logic shall transmit to
the Function Generator signals which allow for the Off-Line testing of the Function Generator.
(3) Control 1 and 2 - The MPD Logic shall transmit to the
Function Generator two parallel lines that inform the Function Generator which word is presently
being transmitted.
3.5.3.4.1.4.2
Input/Output Signal Characteristics
3.5.3.4.1.4.2.1
Maintenance Control Panel, Master Timing Logic and Function
Generator - All internal signals between the MPD Logic and the Maintenance Control Panel, Master
Timing Logic, and Function Generator shall be transmitted over single ended lines where logical
"O" = O + O. 5 -0.0 volts and logical "l" = +5 1.5 volts. The 30 input and 30 output data lines and
control signals are available from the Maintenance Control Panel.
Multipurpose Display Logic - The MPD Logic Input/Output
3.5.3.4.1.4.2.2
Signals to and from the MPD shall be as follows:
(1) Twisted Pair Transmissions - The following transmissions
shall be via twisted pair cable with line driver circuits as referenced in WR -101 Part II. Each pair
shall be terminated by an input amplifier as defined in Appendix II or its electrical equivalent. The
cable shall be limited to 100 feet maximum.
(a) Vertical Position -9 pairs
(b) Horizontal Position - 9 pairs
(c) Character Selection -6 pairs
(d) Character and Cursor Unblank -2 pairs
(e) Focus -3 pairs
(f) Enable Analog Deflection -4 pairs
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