Reliability, VHDL, Traceability and ESD Flashcards
Define FPGA
field-programmable gate array - an integrated circuit configured after manufacture
Define CLB
Configurable logic block which is a component in an FPGA
-allows user to implement any logic function
Define HDL and its purpose
Hardware description language - Describes a circuit so it can be physically replicated
Define VHDL
Very high speed integrated circuit HDL
Name 2 FPGA applications
computer vision systems
-search engine algorithms
How does VHDL describe circuits?
-the interface - what are the inputs and outputs
-the behaviour - what does it do
What are signals in VHDL
The “wires” in a circuit
In VHDL, what does X, -, and U mean
X - strongly driven unknown signal
‘-‘ - dont care
U - unitialised
Define MTBF
Mean time between failure - how long a device can go between repairs
Define MTTF
Mean time to failure - How long an unrepaired device can function before it fails
Define FIT
Failures in time - Number of failures expected per 10^9 hours of operation
How many parts does the bathtub failure rate curve have?
Infant mortality
-Random failure
-Wear-out failure
What variable does failure rate depend on?
Temperature
What does the Weibull Distribution show?
it models a range of random variables in the context of FIT and possible factors of failure
What does the Arrhenius equation show?
-the acceleration factor
-ratio between failure rates at different temperatures
