L3 FA2100 CVR Component Maintenance Manual With Illustrated Parts List page 119

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.
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
The document reference is online, please check the correspondence between the online documentation and the printed version.
AVIATION RECORDERS
COMPONENT MAINTENANCE MANUAL
FA2100CVR
23–70–04
Description and Operation
Rev. 15 Page 42
Apr. 14/16