Glossary
Application software within the software executed by
Device, the part that ensures functionality of End user's
application and integrates safety functions
CCF common cause failure
CM continuous mode
Compliant item any item subject to claim with respect
to the clauses of IEC 61508 series of standards
COTS commercial off-the-shelf
CoU conditions of use
CPU central processing unit
CRC cyclic redundancy check
DC diagnostic coverage
Device depending on context, any single or all of the
silicon products
DMA direct memory access
DTI diagnostic test interval
ECM engine control module
ECU electronic control unit
End user individual person or company who
integrates Device in their application, such as an
electronic control board
EUC equipment under control
FIT failure in time
FMEA failure mode effect analysis
FMEDA failure mode effect diagnostic analysis
HD high-demand
HFT hardware fault tolerance
HW hardware
ITRS international technology roadmap for
semiconductors
LD low-demand
MCU microcontroller unit
MPU memory protection unit
MTBF mean time between failures
MTTFd mean time to dangerous failure
PDS(SR) safety-related power drive system
PEc programmable electronics - core
PEd programmable electronics - diagnostic
PFD probability of dangerous failure on demand
PFH probability of failure per hour
PL performance level
PST process safety time
SFF safe failure fraction
SIL safety integrity level
SILCL safety integrity level claim limit
SRCF safety-related control function
SRECS safety-related electrical control systems
SRP/CS safety-related parts of machinery control
systems
UM2305
Glossary
UM2305 - Rev 10
page 102/110
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