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R  are output in case of initialisation and if an output status must 
R  change. 
R  The received ARINC 429 parameters are multiplexed and stored in the 
R  respective memory, controlled by input port, label and SDI. The ARINC 
R  429 transmitter sends the BITE data from the DFDRS to the CFDIU. The 
R  recorder data for the DFDR is generated by the microprocessor and 
R  output through the harvard biphase ralated bipolar RZ interface. 
R  The time reference for the Cockpit Voice Recorder (CVR) through AMU 
R  is generated and synchronized by the DFDR and output as an audio 
R  signal (frequence shift 4193 Hz = logic 0, 3607 Hz = logic 1). 
R  The microprocessor generates the output formats for the DFDR and 
R  controls the RS 232 interface. The processor updates the data frames 
R  according to the received parameters. The whole data processing and 
R  interface control is managed on the processor board and the I/O board 
R  assembly. 
R  **ON A/C 001-049, 051-099, 101-105, 151-158, 201-209,
 Post SB 31-1154 For A/C 151-154,201-207,
 (4) FDIU Functions
 The software controlled functions of the FDIU are as given below:
 - discrete parameter selection,
 - selection of parameters from ARINC 429 buses,
 - formatting of DFDR/QAR data output,
 - processing of DFDR playback,
 - Built-In Test Equipment (BITE),
 - serving the RS 232 tester interface.
 - DFDR-CVR synchronization
 The processor circuitry is supplied with discrete and ARINC 429
 parameters. The inputs are protected against overvoltage and wiring
 inversion. The processor circuits also filter, amplify, isolate and
 convert the input signals.
 The discrete input data are mutiplexed (1 receiver) and the status of
 these signals is stored and updated in the memory. The discrete
 output data is available through the output interface. These signals
 are output in case of initialisation and if an output status must
 change.
 The received ARINC 429 parameters are multiplexed and stored in the
 respective memory, controlled by input port, label and SDI. The ARINC
 429 transmitter sends the BITE data from the DFDRS to the CFDIU. The
 recorder data for the DFDR and QAR are generated by the 

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-33-00Page 57 1201-210, 1May 01/05 1 1 1CES 1 microprocessor and output through the harvard biphase related bipolar RZ interface. The time reference for the Cockpit Voice Recorder (CVR) through AMU is generated and synchronized by the DFDR and output as an audio signal (frequence shift 4193 Hz = logic 0, 3607 Hz = logic 1). The microprocessor generates the output formats for the DFDR/QAR and controls the RS 232 interface. The processor updates the data frames according to the received parameters. The whole data processing and interface control is managed on the processor board and the I/O board assembly.

 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,
 (5)
 Verification of DFDR Playback Data To verify the recorded data, the FDIU receives the playback data via a serial data bus. The sync word is checked every 64th/128th input for the proper sync pattern. If a defective sync pattern is detected, the DFDR PLAYBACK fault flag will be written into the fault memory of the FDIU. The FDIU also accepts DFDR data without playback.

 (6)
 Identification of Location The FDIU recognizes its location on different aircraft by decoding the aircraft identification and aircraft type, the fleet and the DFDR format version. Parameter selection and data processing depends on this identification code. This information is input to the FDIU through 68 discrete input lines.

 

R **ON A/C 106-149, 211-299, 301-399, 401-499,
 (5)
 Verification of DFDR Playback Data To verify the recorded data, the FDIMU (FDIU-part) receives playback data from the DFDR via a serial data bus. The sync word is checked every 64th/128th/256th input for the proper sync pattern. If a defective sync pattern is detected, the DFDR PLAYBACK fault flag will be written into the fault memory of the FDIMU (FDIU-part). The FDIMU also accepts DFDR data without playback.

 (6)
 Identification of Location The FDIMU recognizes its location on different aircraft by decoding the aircraft identification and aircraft type, the fleet and the DFDR format version. Parameter selection and data processing depends on this identification code. This information is input to the FDIMU through 54 discrete input lines.
　
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