Figure Q2 subtractor that is designed using full adder modules. Verilog code of adder module is given in Listing Q2(b). Input M controls the operation mode of the FBD. i. Determine the operation mode of the FBD when M = 0 and M = 1. Justify your answer. i. Determine S and c values, if M=0, A=10102, B = 11002.

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(b) Figure Q2(b) illustrates Functional Block Diagram (FBD) of a four-bit adder-
subtractor that is designed using full adder modules. Verilog code of the full
adder module is given in Listing Q2(b). Input M controls the operation mode of
the FBD.
i. Determine the operation mode of the FBD when M = 0 and M = 1. Justify
your answer.
ii. Determine S and c values, if M=0, A=10102, B = 11002.
Transcribed Image Text:(b) Figure Q2(b) illustrates Functional Block Diagram (FBD) of a four-bit adder- subtractor that is designed using full adder modules. Verilog code of the full adder module is given in Listing Q2(b). Input M controls the operation mode of the FBD. i. Determine the operation mode of the FBD when M = 0 and M = 1. Justify your answer. ii. Determine S and c values, if M=0, A=10102, B = 11002.
CA
B3 A3
Co
b
a
FA4
S
S3
C₁
C3
B₂ A₂
b
Co
a
FA3
S
S₂
C₁
C2
B₁
A₁
ba
FA2 C
S
S₁
Figure Q2(b)
Во
Listing Q2(b)
Ao
b a
FAI C
S
C1
20
So
module fulladd (ci, a, b, s, co);
input ci, a, b;
output s, co;
Co
assign s = a^b^ci;
assign co = (a&b) | (a&ci)| (b&ci);
endmodule
-M
Transcribed Image Text:CA B3 A3 Co b a FA4 S S3 C₁ C3 B₂ A₂ b Co a FA3 S S₂ C₁ C2 B₁ A₁ ba FA2 C S S₁ Figure Q2(b) Во Listing Q2(b) Ao b a FAI C S C1 20 So module fulladd (ci, a, b, s, co); input ci, a, b; output s, co; Co assign s = a^b^ci; assign co = (a&b) | (a&ci)| (b&ci); endmodule -M
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