FPGAmath

Building math circuits

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The article Building Math Circuits describes how elementary math operations, such as addition/subtraction, multiplication/division and square root, can be done using logic circuits.

The repository contains HTML simulations used in the article, as well as Verilog HDL implementations of

  • Adder
    • ripple carry
    • look ahead
    • look ahead with 2 levels
  • Subtractor
    • ripple borrow
  • Multiplier
    • array
    • carry save
  • Divider
    • attempt subtraction

Demo

But what good are fast math circuits, if you can’t show them off? We decided to make a test setup to both demonstrate and verify the implementation of the circuits.

In the demo, an Arduino reads the operands from rotary encoders and shows them on 7-segment displays. It sends the operands along with the desired operation to the FPGA. That then returns the result to the Arduino, that shows it on the display.

math_demo_video

Details of the demonstation setup can be found here.

Feedback

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GitHub

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