COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Page 39
Nov. 01/98
Description and Operation
23–70–04
The Acquisition Processor interfaces with three internal functional modules: Aircraft
Interface, Audio Compressor, and CSMU. Additionally, is an external interface to the
Ground Support Equipment (GSE).
(1) Aircraft Interface
The Aircraft Interface (AI) Interface involves the following external power inputs
and outputs:
(a) External power input +39 Vdc storage supply, +15 V, and +5 V (storage)
from the Aircraft Interface PWA.
(b) External power output +18 V preamp power, +5 V, and $12 V to the Air-
craft Interface PWA.
(2) Audio Compressor
The Audio Compressor (AC) Interface consists mainly of the Time Division Mul-
tiplexing (TDM) bus. Audio data is transmitted by the AC via the TDM bus to
the Store Manager Processor (SMP). Additionally, an 8.192 MHz clock is out-
put to the AC to be used as the time base for audio sampling. AC Reset and
Test mode as well as operating voltages of $5 V are also routed through this
interface.
(3) Crash Survivable Memory Unit
The Crash Survivable Memory Unit (CSMU) Interface consists mainly of the
buffered high speed serial bus of the SMP. Command and data messages are
transmitted by the Acquisition Processor (AP) to the CSMU. These messages
involve the various data types to be stored in the flash memory of the CSMU.
The CSMU transmits data messages to the AP only in response to commands
issued by the AP. Additionally, +5 V and +12 V power for the CSMU and
CSMU reset are routed through this interface.
(4) Ground Support Equipment Interface
The Ground Support Equipment (GSE) Interface consists of the buffered TDM
bus, the multiplexed/buffered high–speed serial buses, multiplexer control in-
put, test mode control input, program flash power/control input, and 39 Vdc cur-
rent limited (GSE pwr, 4–watt available), and +5 V (prgm vpp ap). This inter-
face allows external equipment to monitor microprocessor data transfers within
the recorder, copy the contents of flash memory from the CSMU, download/
upload application software to/from the SMP, and perform functional testing of
the recorders.
May 21/1
Rev. 11 Page 39
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