Software Lab # XXXXXXXXXXPoints Two big circuits will be pieced together in this lab: (1) the Arithmetic Logic Unit (ALU) will be able to perform any of 16 functions on two 4-bit inputs and (2) the microprocessor (MP) will incorporate the ALU to read in values and write out the results. And, as usual, there are a couple fundamental building blocks to make first. File to create (4): Buffer_4.cct Reg_4.cct LOGIC_BLOCK.cct ALU.cct Microprocessor.cct Files to submit (1): Lab Report: S_Lab4_LastName_FirstName.pdf Task #1 – (5 Points) 4-bit Buffer Build a 4-bit buffer using 1-bit tri-state buffers (named “Buffer-1 T.S.” in LogicWorks). This buffer will be used to simply pass data directly from inputs to outputs when enabled or prevent the passing of data when not enabled. A tri-state device has three states: Low, High, and High Impedance (Z). You may have seen the Z previously in your circuit design when you had a broken wire in your circuit. This is the same as a High Impedance, or Open Circuit. This Z state will be useful for using devices connected to a common data bus where multiple devices are vying for the same data information. The 4-bit buffer must have two active-high enables which both must be high to enable the inputs to pass to the outputs. XXXXXXXXXXPage 11 Z A3 0 1 Z A2 0 BC 1 Z A1 0 1 Z A0 0 1 EN1 0 1 EN0 0 Build and test this circuit. Save it as a device symbol named BUFFER_4.cct. In your lab report include: ? A narrative description of how this circuit works ? Gate level implementation testing 0100 with an Enable low ? Device symbol implementation testing a hex input of 8 with both Enables HIGH. Buffer_4 XXXXXXXXXXA3 XXXXXXXXXXA2 Y3 8 9 A B A1 Y2 8 C D E F A0 Y1 EN1 Y0 EN0 1 0 1 0 ...
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