Flashcards
previous exam questions
Cards in this deck (8)
- 1outline the main rules to be observed when designing fundamental mode circuits1) only one input signal is allowed to change at a time
2) before the next input signal is allowed to change, the circuit must be given time to enter astable state. - 2under what circumstance does a race condition occur within an asynchronous logic circuit?when two or more state variables are supposed to change at the same time due to a change in the input
- 3explain with diagrams the difference between sequential and combinational logic circuitscombinational output relies only on the present state
sequential output relies on present state and historical states, it contains memory
(draw them, same as other flashcards) - 4explain the difference between synchronous and asynchronous counters*synchronous counters all use a single external clock, they are faster
*asynchronous clocks are fed from the output of the previous flipflop, known as ripple counters - 5Explain the differences between Mealy and Moore state machines
- 6Perform the following arithmetic operation using BCD system +27 +46 =73
- 7what is a decoder?its function is to detect the presence of a specific combination
- 8what is an encoder?its function is to convert inputs into boolean logic
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- Level 5 Digital and Embedded systems Flashcards on previous exam questions , created by Steven Pearson on 08/05/2018.
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- Steven Pearson
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