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Which gate can be used as a bit comparator?
Comparators are used in central processing units (CPUs) and microcontrollers (MCUs). Examples of digital comparator include the CMOS 4063 and 4585 and the TTL 7485 and 74682. Note: An XNOR gate is a basic comparator, because its output is “1” only if its two input bits are equal.
How does a 4-bit comparator work?
A comparator used to compare two binary numbers each of four bits is called a 4-bit magnitude comparator. It consists of eight inputs each for two four bit numbers and three outputs to generate less than, equal to and greater than between two binary numbers.
How to create a 4-bit comparator based on 2-bit logic?
Firstly, a 2-bit comparator is implemented based on the logic expressions from the truth table of each output. Next, likewise, it generates a 4-bit comparator by instantiating two models of the 2-bit comparators and some extra logic gates.
Which is the truth table of a 4-bit comparator?
Comparing to the truth table of a 2-bit comparator, a 4-bit comparator will be used 4-bit in input A and 4-bit in input B. Therefore, the truth table of the 4-bit comparator is the following table below. From the table above, the logic expressions of each output are:
How to create a 4 bit comparator in Verilog?
By combining all knowledge learned so far, the source code of the 4-bit comparator in Verilog is: Then, it can generate a schematic of the 4-bit comparator when clicking “Open Elaborated Design” in Flow Navigator on the left side.
How to write a 1 bit comparator equation?
A 1-bit comparator compares two single bits. Let’s apply a shortcut to find the equations for each of the cases. Normally, we can use a K-map. But this shortcut is efficient and handy when you understand it. For A>B, there is only one case when the output is high when A=1 and B=0. Let’s call this X. We can write the equation as follows