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Digital Hardware Design
Sequential machines can be designed in two different ways: (i) Mealy Machine & (ii) Moore Machine Considering Mealy or Moore for the designing of sequential machine, it’s actually difficult to draw a hard line where one machine is always better than the other. Depending on the application requirement one may dominate the other. It is…
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Design of sequential circuit can be composed of designing combinational circuit and state register. Sequential circuits are implemented in two different ways: We can represent a sequential machine as M = <I,O,S,f,g>; where I: Input setO: Output setS: State spacef: A function mapping IxS = Og: A function mapping IxS = S Let’s understand both…
Verilog language has the capability of designing a module in several coding styles. Depending on the needs of a design, internals of each module can be defined at four level of abstractions. Irrespective of the internal abstraction level, the module would behave exactly in the similar way to the external environment. Following are the four…
This post contains some very interesting interview questions asked by Synopsys the EDA giant in its interview. The questions are based on Verilog Synthesis and Simulation. Though I have included the answers; I would encourage the reader to experiment himself or herself and then discuss these in the forum. 1. How a latch gets inferred…
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Case and Conditional Statements are available in both VHDL and Verilog. These are considered as significant features of behavioral modelling, be it in VHDL or Verilog. Behavioral modelling provides high level abstraction so that the circuit can be designed by programming its functionality. Let’s say, we have to design a circuit that selects a particular…
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Problem Statement: Design a circuit for an edge triggered 4-bit binary up counter (0000 to 1111). When it reaches “1111”, it should revert back to “0000” after the next edge. Use positive edge triggered D flip-flop (shown in the below figure) to design the circuit. Pin Input / Output Description D Input Data Input CLK…
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Flip-Flop (FF) and Latch are digital electronic circuits that are used to store information in bits as they have two stable states. One FF or latch can store 1 bit of information. FF is a circuit that can be made to change its state by applying signals to one or more control inputs and will have…
Combinational and Sequential circuits are the most essential concepts to be understood in digital electronics. Sequential logic is a type of logic circuit whose output depends not only on the present value of its input signals but on the sequence of past inputs. Combinational Logic Circuits Sequential Logic Circuits Output is a function of the…
Read More “Difference between Combinational and Sequential logic circuits.” »
These are some simple steps which can be used to do the power analysis of a design using Xpower Analyzer which comes readily available in the ISE free web pack. ## Make sure your circuit can be synthesized. Then under the implement design option in the project navigator, Place and Route the design. ## The…
Verilog and VHDL are Hardware Description languages (HDL) that are used to describe the behavior and structure of electronic systems. HDL languages are different form software language like ‘C’, as they use concurrency constructs to simulate circuit behavior. HDL includes a means of describing propagation time and signal strength. Verilog Vs. VHDL