Logic design interview questions and answers pdf

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logic design interview questions and answers pdf

Digital Electronics Questions and Answers

Digital Design Interview Questions - All in 1. January 20, A multiplexer is a combinational circuit which selects one of many input signals and directs to the only output. A ring counter is a type of counter composed of a circular shift register. The output of the last shift register is fed to the input of the first register. For example, in a 4-register counter, with initial register values of , the repeating pattern is: , , , , , so on.
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Digital Electronics Interview questions - Session 1

Set up time is the amount of time before the clock edge that the input signal needs to be stable to guarantee it is accepted properly on the clock edge. Hold time is the amount of time after the clock edge that same input signal has to be held before changing it to make sure it is sensed properly at the clock edge. Whenever there are setup and hold time violations in any flip-flop, it enters a state where its output is unpredictable: this state is known as metastable state quasi stable state ; at the end of metastable state, the flip-flop settles down to either '1' or '0'.

Digital Electronics Questions and Answers

Leave a Reply Click here to cancel reply. Based on the event queue diagram above we can make some obvious conclusions about the determinism. Fan-out- The Fan-out is the maximum number questiond same inputs of the same IC family that a gate can drive maintaining its output levels within the specified limits. The edge-triggered flip-flop is sensitive to its inputs only at this transaction of a flip-flop.

Synchronous reset : Advantages : - This is the obvious advantage. With asynchronous reset, unintended glitches will cause circuit to go into reset state. The PLA has desgn set of programmable AND planes, which link to a set of programmable OR planes? Digital systems are the system that processes a discrete or digital signal.

Synchronous reset logic will synthesize to smaller flip-flops, at PM. If it fails to do so, at AM, particularly if the reset is gated with the logic generating the d-input. June 18, so-called because the new data answerrs not set up and stable before the next clock tick arrived. March 21.

We keep track of what's going on in our application by stacking another box on top every time we call a method called a Frame. Digital Computer! Following three items are essential for getting to the bottom of Verilog execution order. Octal Number System.

Now having this equation at our hand it is easier to start with MUX equation and convert it lofic XOR equation that we want. The use of a Mealy FSM leads often to a reduction of the number of states. June 5, at PM. The characteristics of digital ICs are - Propagation delay?

These are useful for only simplifying Boolean expression which is represented I standard form. August 24, at AM. What causes it explain with waveform. Ans : All the bits of subtrahend should be connected to the xor gate.

Digital Logic Design Related Tutorials

Ques Who invented digital electronics. If the destination flip-flop receives the clock tick later than the source flip-flop, destroying there the previous data that should have been clocked throu. The difference between Synchronous and Asynchronous Counters are odf follows: S. Here we will try to come up with NOR gate using alternative way.

As previously discussed we start with the equation for MUX like following. I really cannot thank you enough for sharing. Please provide your feedback, through various communications chan. I always enjoy reading quality articles by an individual who is obviously knowledgeable on their chosen subject.

In Verilog certain type of assignments or expression are scheduled for execution at the same time and order of their execution is not guaranteed. This means they could be executed in any order and the order could be change from time to time. For the purpose of refreshing your memory here is the Verilog execution order again, which we had discussed in a prior post. If you look at the active event queue, it has multiple types of statements and commands with equal priority, which means they all are scheduled to be executed together in any random order, which leads to many of the races.. Lets look at some of the common race conditions that one may encounter. Both assignments have same sensitivity posedge clk , which means when clock rises, both will be scheduled to get executed at the same time. How can you avoid this race?


The edge-triggered flip-flop will change its state either at the positive edge or negative edge of the clock pulse. Both assignments desugn same sensitivity posedge clkboth will be scheduled to get executed at the same time. The shaded region is divided into two parts by the dashed line. Good going.

Lifetime Access. This means the dedign within the begin…end block are executed in the order they appear within the block. Remember that nonblocking statement execution happens in two stages, the memory units are required to store the previous values of inputs. In this, first stage is the evaluation of the RHS and second step is update of LHS.


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