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|  MIL-D-81347C(AS)
3.5.3.4.4
Master Timing Logic
Functional Description - The Master Timing Logic (MTL) shall
3.5.3.4.4.1
provide the timing and control signals necessary to "line-lock" (sync) display operations to the air-
craft's 400 Hz power source. It shall also provide diagnostic control for Logic Unit 3.
Figure 127 is a functional flow diagram of the MTL.
3.5.3.4.4.2
Interface Requirements
3.5.3.4.4.2.1
General
Signa1 S to Master Timing Logic - The MTL shall receive sig-
3.5.3.4.4.2.1..1
nals shown in Figure 127 from both the MPD 1 Logic, MPD 2 Logic, the PDL, the FGL, the power
supply, the MCP and the computer.
Signals from MPD 1 Logic - The signals received from the MPD
3.5.3.4.4.2.1.1.1
1 Logic shall be as follows:
(1) Radar Scan Converter Enable - When this signal is present,
the MTL shall transmit the RADAR S. C. Enable signal to both the Radar Scan Converter and MPD 1
Logic, and the RADAR Unblank to MPD 1.
(2) Spare Scan Converter Enable - When this signal is present,
the MTL shall transmit the SPARE S. C. Enable signal to both the Spare Scan Converter and MPD 1
Logic.
(3) LLLTV Active - When this signal is a logic "1", the MTL
shall cause the sync pulse to be generated at a 57.1 HZ rate. When this Signal is a logic "0", the
MTL shall cause the sync pulse to be generated at a 40 Hz rate.
(4) Diagnostic Data - When so instructed MPDL 1 shall trans-
mit 24 bits of diagnostic data and a diagnostic sync to the MTL.
Signals from MPD 2 Logic - The signals received from the MPD
3.5.3.4.4.2.1.1.2
2 Logic shall be as follows:
(1) Radar Scan Converter Enable - When this signal is present,
the MTL shall transmit the RADAR S.C. Enable signal to both the Radar Scan Converter and MPD 2
Logic, and the Radar Unblank to MPD 2.
(2) Spare Scan Converter Enable - When this signal is present,
the MTL shall transmit the SPARE S. C. Enable signal to both the Spare Scan Converter and MPD 2
Logic.
(3) LLLTV Active - When this signal is a logical "l", the MTL
shall cause the Sync pulse to be generated at a 57. 1 Hz rate. When this signal is a logical "O", the
MTL shall cause-the `sync pulse to be, generated at a 40 Hz rate.
Diagnostic Data - When so instructed the MPDL 2 shall
transmit 24 bits of diagnostic data and a diagnostic sync to the MTL.
Signals from Power Supply - The MTL shall receive from the
3.5.3.4.4.2.1.1.3
power supply a 400 Hz 10% sine wave which is synchronized to the aircraft primary power source.
Signals from Function Generator Logic - When instructed the
3.5.3.4.4.2.1.1.4
FGL shall transmit 12 bits of diagnostic data and a diagnostic sync to the MTL.
Signals from Pilot Display Logic - When so instructed the PDL
3.5.3.4.4.2.1.1.5
shall transmit 12 bits of diagnostic data and a diagnostic sync to the MTL.
217
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