Memsic DMU380SA Series, User Manual

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DMU380SA Series
User’s Manual
________________________________________________________________________
Doc# 7430-0026 Rev. 01 Page 70
9 Advanced BIT
Built In Test (BIT) and Status Fields 9.1
Internal health and status are monitored and communicated in both hardware and
software. The ultimate indication of a fatal problem is a hardware BIT signal on the user
connector which is mirrored in the software BIT field as the masterFail flag. This flag is
thrown as a result of a number of instantly fatal conditions (known as a “hard” failure) or
a per
sistent serious problem (known as a “soft” failure).
Soft errors are those which must
be triggered multiple times within a specified time window to be considered fatal. Soft
errors are managed using a digital high-pass error counter with a trigger threshold.
The masterStatus flag is a configurable indication as determined by the user. This flag is
asserted as a result of any asserted alert signals which the user has enabled.
The hierarchy of BIT and Status fields and signals is depicted here:

BITstatus Field

masterFail

hardwareError

hardwareBIT Field

powerError

hardwarePowerBIT Field

inpPower

inpCurrent

inpVoltage

fiveVolt

threeVolt

twoVolt

twoFiveRef

sixVolt

grdRef

environmentalError

hardwareEnvironmentalBIT Field

pcbTemp

comError

comBIT Field

serialAError

comSerialABIT Field

transmitBufferOverflow

receiveBufferOverflow

framingError

breakDetect