previous exam questions

Question	Answer
outline the main rules to be observed when designing fundamental mode circuits	1) 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.
under 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
explain with diagrams the difference between sequential and combinational logic circuits	combinational 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)
explain 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
Explain the differences between Mealy and Moore state machines	Image: Compare M And M (binary/octet-stream)
Perform the following arithmetic operation using BCD system +27 +46 =73	Image: Img 20180508 1422008 (binary/octet-stream)
what is a decoder?	its function is to detect the presence of a specific combination Image: Picture1 (binary/octet-stream)
what is an encoder?	its function is to convert inputs into boolean logic Image: Picture2 (binary/octet-stream)

Resource summary

	Created by Steven Pearson over 6 years ago