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1. In Digital, open the "4-bit subtractor" circuit (RCS4.dig) 2. You should see inputs and outputs similar to the 4-bit RCA. 3. Create something similar to your 4-bit RCA circuit (see image below) but now, pass each bit of the subtrahend (operand B) through the logic gate that flips it. (You already know which logic gate - you answered the question earlier!) 4. Rotate the gate so that it faces SOUTH. 5. Make sure to set the correct carry-in bit to the correct value! It should look something like this: O Cin AB Cin AB Cir AB Cin B Cin Full Adder Full Adder Full Adder Full Adder Cout SUM Cout SUM Cout SUM Cout SUM Cout Does your subtractor circuit work? Try to input A= -5 and B = -3 as operands. Be mindful of which bits correspond to A3A2A1A0 and B3B2B¡Bo! What answer did you get? Input your answer in bits, and remember to consider only S3S2S1S0, i.e. discard Cout. Answer: O A3 O B3 O A1 S1 O B1 O A0 O BO

1. In Digital, open the "4-bit subtractor" circuit (RCS4.dig) 2. You should see inputs and outputs similar to the 4-bit RCA. 3. Create something similar to your 4-bit RCA circuit (see image below) but now, pass each bit of the subtrahend (operand B) through the logic gate that flips it. (You already know which logic gate - you answered the question earlier!) 4. Rotate the gate so that it faces SOUTH. 5. Make sure to set the correct carry-in bit to the correct value! It should look something like this: O Cin AB Cin AB Cir AB Cin B Cin Full Adder Full Adder Full Adder Full Adder Cout SUM Cout SUM Cout SUM Cout SUM Cout Does your subtractor circuit work? Try to input A= -5 and B = -3 as operands. Be mindful of which bits correspond to A3A2A1A0 and B3B2B¡Bo! What answer did you get? Input your answer in bits, and remember to consider only S3S2S1S0, i.e. discard Cout. Answer: O A3 O B3 O A1 S1 O B1 O A0 O BO

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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1. In Digital, open the "4-bit subtractor" circuit (RCS4.dig) 2. You should see inputs and outputs similar to the 4-bit RCA. 3. Create something similar to your 4-bit RCA circuit (see image below) but now, pass each bit of the subtrahend (operand B) through the logic gate that flips it. (You already know which logic gate - you answered the question earlier!) 4. Rotate the gate so that it faces SOUTH. 5. Make sure to set the correct carry-in bit to the correct value! It should look something like this: O Cin AB Cir AB Cin B Cin B Cin Full Adder Full Adder Full Adder Full Adder Cout SUM Cout SUM Cout SUM Cout SUM Cout Does your subtractor circuit work? Try to input A= -5 and B = -3 as operands. Be mindful of which bits correspond to A3A2A1A0 and B3B2B1Bo! What answer did you get? Input your answer in bits, and remember to consider only S3S2S1S0, i.e. discard Cout. Answer: 08 O Ov O 18 O S1 O A1 za O O A2
Transcribed Image Text:1. In Digital, open the "4-bit subtractor" circuit (RCS4.dig) 2. You should see inputs and outputs similar to the 4-bit RCA. 3. Create something similar to your 4-bit RCA circuit (see image below) but now, pass each bit of the subtrahend (operand B) through the logic gate that flips it. (You already know which logic gate - you answered the question earlier!) 4. Rotate the gate so that it faces SOUTH. 5. Make sure to set the correct carry-in bit to the correct value! It should look something like this: O Cin AB Cir AB Cin B Cin B Cin Full Adder Full Adder Full Adder Full Adder Cout SUM Cout SUM Cout SUM Cout SUM Cout Does your subtractor circuit work? Try to input A= -5 and B = -3 as operands. Be mindful of which bits correspond to A3A2A1A0 and B3B2B1Bo! What answer did you get? Input your answer in bits, and remember to consider only S3S2S1S0, i.e. discard Cout. Answer: 08 O Ov O 18 O S1 O A1 za O O A2
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