Combine your adder, adder/subtracter, and comparator from previous projects into a single ALU. Notice that you will not be implementing the ALU described in the textbook. Your ALU will have different operations and op codes.

Your ALU must perform the following 16-bit operations:

• Use this GitHub Classroom link to create a repository for the project.
• Use ALU_16bit.jls and don't rename any inputs or outputs.
• Set the Overflow output to 0 if overflow doesn't apply to the given operation. Specifically, Overflow should be 0 for all operations except signed addition and signed subtraction. (Interestingly enough, by definition, unsigned addition and unsigned subtraction do not overflow.)
• The not operator returns the negation of InputA. Ignore InputB.
• lui stands for load upper immediate. Take the lower 8 bits of InputA and place them in the upper 8 bits of the output. Ignore InputB.
• slt stands for set if less than. The output should be 1 if InputA is less than InputB and 0 otherwise. slt treats the inputs as signed integers, sltu treats the numbers as unsigned.
• Your entire ALU may contain one adder only. Your Adder/Subtractor from the previous project should already follow this design. You may need to slightly modify your comparator circuit so it uses your Adder/Subtractor.

Hints and shortcuts

• You may find this sample test script helpful: Sample16BitALUTest.java
• Remember, JLS inserts the code for sub-circuits directly into the circuits into which they are imported. Thus, changes to sub-circuits are not seen by the circuits that contain them. If you discover a bug in a sub-circuit, you must delete and re-import that sub-circuit into the parent. (Again, test your subcircuits thoroughly before importing them!)
• Remember that no software is perfect. This includes JLS and DLUnit. Commit and push often.

Grading

You are expected to revise your circuits and analysis documents until both (1) the automated tests pass, and (2) your circuit design and layout have earned a score of "E" or "M". Project "Late Days" will accumulate until both requirements have been satisfied. Remember: There are two separate sets of tests to run.

You can accumulate up to -1 Late Days if you project meets all requirements before the deadline. (Negative Late Days can be used to offset any Late Days acquired on other projects or labs.)

Deliverables

To submit your project:

1. Add a text box to your jls files that includes the names of everybody on the team.
2. Commit and push your code.
3. When your code passes all my tests, add [Grade Me] to the commit message.

Updated Monday, 4 October 2021, 1:39 PM