COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 53
Apr. 14/16
Description and Operation
23–70–04
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
8.
SOFTWARE CONSIDERATIONS (P/NS: 2100
−
1X25/1X26/1X27
−
( )
and 2100
−
1X20
−
( ) MOD
−
DOT#7)
A.
Equipment Environment
The hardware environment for the 2100
−
1X25/1X26/1X27
−
( ) and 2100
−
1X20
−
( )
MOD
−
DOT #7
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 Surviv-
able Memory Unit (CSMU). In addition there are external interfaces attached 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 receive ex-
ternal control/state information.
B.
Software Partitioning
Software for the Model FA2100 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 forwarding
of Data Link messages. The other processor, called the Storage Management Proc-
essor (SMP), is responsible for the collection of audio data, the management 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 FA2100 Cockpit Voice Recorders varies de-
pending on the specifics of the part number produced. The types of memory pres-
ent 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; and
Flash memory within the CSMU, that is used to store Data Link and audio data.
Each DSP has a total of 10k words of built
−
in RAM. Each DSP has access to 64k of
ROM for the executable program image. The system contains one NVRAM with a
minimum of 2k words being required.
D.
Interfaces
The system level inputs dedicated to the CVR functions are:
F
Audio Data Input
F
Audio Frame Synch Input
F
Bulk Erase Input
F
Channel Tone Select Output
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