COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 40
July 21/17
Description and Operation
23–70−30
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
(TDM) Bus transmission to the MP. Discrete data from the AI are consolidated into
word format prior to TDM transmission.
Discrete data received over the TDM Bus from the Main Processor provides the
Built–In Test (BIT) control and with BIT fault status; fault status data are output to the
Aircraft interface PWA. Additionally, audio data reprocessed on the Main Processor
are output to the Aircraft Interface for audio monitoring. Power/ground and a mas-
ter reset are derived from the Main Processor PWA.
The Main Processor PWA interfaces with the Aircraft Interface . The MP/AI interface
comprises four audio input channels: an audio monitoring output channel, a serial
ARINC 429 GMT data input channel, and inputs for rotor speed frequency and dis-
crete control data. The MP/MP Interface consists of a serial TDM bus, a master
clock signal, a master reset, a test mode control bit, and power/ground interconnec-
tions.
8. SOFTWARE CONSIDERATIONS
A. Equipment Environment
The hardware environment for the Solid State Cockpit Voice Recorder is composed
of a pair of TMS320C50 Digital Signal Processors (DSPs), an external program
memory for each DSP that contains the executable program code, one external
NVRAM for non−crash critical data storage and a flash memory array located in a
Crash Survivable Memory Unit (CSMU). In addition there are external interfaces at-
tached to each DSP to allow external communication for testing purposes, interfaces
to allow the system to gather data for storage, and interfaces used to send and re-
ceive external control/state information.
B. Software Partitioning
Software for the Model FA5000 CVR Solid State Flight Recorders will be partitioned
into two parts. This is to accommodate the use of two DSPs. One DSP, called the
Flight Data Processor (FDP), is responsible for the collection, processing, and for-
warding of Data Link messages. The other processor, called the Storage Manage-
ment Processor (SMP), is responsible for the collection of audio data, the manage-
ment of the CSMU, and other ancillary functions. Communication between the two
processors will be over the device−specific TDM (time division multiplexing) serial
link.
C. Memory Requirements
The memory requirements for the Model FA5000 Cockpit Voice Recorders varies de-
pending on the specifics of the part number produced. The types of memory
present in the recorders are: RAM, which is built into the DSP chip; ROM, containing
the program image; NVRAM, which is used to store fault and start−up information;
The document reference is online, please check the correspondence between the online documentation and the printed version.
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