What is the function of the exclusive-OR gates in an adder/subtracter circuit?

What is the function of the exclusive-OR gates in an adder/subtracter circuit?

 
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Why is frequency division necessary for many logic circuits?

Why is frequency division necessary for many logic circuits?

 
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Using Quartus II, or an equivalent VHDL entry program,

Using Quartus II, or an equivalent VHDL entry program, develop the text file and simulation for the 74LS194A

universal, bi-directional shift register. Attach the .vhd and simulation files.

 
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When designing a counter, the decision to make it an asynchronous or synchronous can depend on the frequency max.

When designing a counter, the decision to make it an asynchronous or synchronous can depend on the frequency max.

How is the frequency max different between asynchronous and synchronous?   Explain your rationale.

 
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