COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 149
July 21/17
Testing & Fault Isolation
23–70−30
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
9. CRASH-SURVIVABLE MEMORY UNIT (CSMU)
Table 104. 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 Management;
Wear Leveling;
Data Verification
Over/Under
Voltage
The FPGA does not
operate properly: It
does not initialize
some command exe-
cutions
The CVDR does
not operate
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 Management;
Wear Leveling;
Data Verification
Incorrect O/P The FPGA does not
operate properly: It
does not initialize
some command exe-
cutions
The CVDR does
not operate
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 Management;
Wear Leveling;
Data Verification
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 Inter-
ference
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
The document reference is online, please check the correspondence between the online documentation and the printed version.
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