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correct the ALU

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The ALU supports set on less than (slt) using just the sign bit of the adder. Let's try a set on less than operation using the values -7ten and 6ten. To make it simpler to follow the example, let's limit the binary representations to 4 bits: 1001two and 0110two. 1001two - 0110two = 1001two + 1010two = 0011two This result would suggest that -7 > 6, which is clearly wrong. Hence, we must factor in overflow in the decision. Modify the 1-bit ALU depicted below to handle slt correctly.

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The ALU supports set on less than (slt) using just the sign bit of the adder. Let's try a set on less than operation using the values -7ten and 6ten. This solution provides a detailed, step by step solution to the given problem.

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Solution provided by:
Sandeep Bardia, MBA
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  • BCom, SGTB Khalsa College, University of Delhi
  • MBA, Rochester Institute of Technology
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