COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
Model FA5000
Rev. 03 Page 234
Feb. 27/13
FDR Function Testing & Fault Isolation
23–70
−
40
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the restrictions on the cover page of this document.
Table 206. CSMU Troubleshooting Chart
Item ID
Function Type
Failure Mode
Local Effect
Next Effect
End Effect
0001A
−
FPGA
Watch Dog Timer;
CSMU Interface;
Rx/Tx; writes to
NVSDRAM; Bad
Block Manage-
ment; Wear Level-
ing; Data Verifica-
tion
Over/Under
Voltage
The FPGA does not
operate properly: It
does not initialize
some command ex-
ecutions
The CVDR
does not oper-
ate properly
The CVDR does not operate
properly: Some data may be
corrupt and may not be re-
corded, stored or copied
Watch Dog Timer;
CSMU Interface;
Rx/Tx; writes to
NVSDRAM; Bad
Block Manage-
ment; Wear Level-
ing; Data Verifica-
tion
Incorrect O/P
The FPGA does not
operate properly: It
does not initialize
some command ex-
ecutions
The CVDR
does not oper-
ate properly
The CVDR does not operate
properly: Some data may be
corrupt and may not be re-
corded, stored or copied
Watch Dog Timer;
CSMU Interface;
Rx/Tx; writes to
NVSDRAM; Bad
Block Manage-
ment; Wear Level-
ing; Data Verifica-
tion
Single Event
Upset (SEU)
The FPGA initially
does not operate: It
is in an undeter-
mined condition
The MP PWA
initially does not
operate
The CVDR initially does not
operate: Some data may be
corrupt, lost and/or may not
be recorded, stored or
copied NOTE: The corrup-
ted FPGA is erased and re-
placed
0002A
−
SDRAM
Non
−
Volatile
Memory
Loss of Power
All memory is lost:
The SRAM is unable
to execute the sys-
tem’s program
The CSMU fails
to operate
The CVDR fails to operate
Non
−
Volatile
Memory
Over/Under
Voltage
All memory is lost:
The SRAM is unable
to execute the sys-
tem’s program
The CSMU fails
to operate
The CVDR fails to operate
Non
−
Volatile
Memory
Electrical In-
terference
Software glitch flips
data bits, causing
data corruption such
as lost, missing or
scrambled data
The CSMU
does not oper-
ate properly:
Some data may
be corrupt and
may not be
copied
The CVDR initially does not
operate: Some data may be
corrupt, lost and/or may not
be recorded, stored or
copied NOTE: The
SDRAM resets and is able
to copy data
0003A
−
Flash
Memory
Non
−
Volatile
Memory
Loss of Power
The Flash Memory
fails: unable to store
data and the
SDRAM is unable to
copy data
The CSMU fails
to operate prop-
erly
The CVDR does not operate
properly: Some data may be
corrupt and may not be re-
corded, stored or copied
Rev.04 Page 234
Mar. 21/14
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