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  • Author Author: timswift
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4 Bit ALU

timswift

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This is my 4 bit test ALU.

It has 6 functions, Add with carry, Subtract with carry, Shift Right with carry fill, AND, OR, and XOR.

 

While assembling the ALU I made some errors two of them being with the adder carry chain being wired backwards (MSB to LSB)

And the same with the shifter; wired to left shift instead of right shift.

 

It uses 181 transistor's and I am currently constructing the full 8 bit ALU which will contain 346 transistor's.

 

A photograph with labels:

         image

   The small Mux is to select the carry out from ether the adder, shifter, or the carry In.

   The inverter mux selects between invert or pass (used to select subtraction/addition).

 

 

Tim

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