An 8-bit carry-select adder is given below. If the propagation delay for a gate is 2 nsec, how long does it take for the complete result [s7:s0] of an 8-bit addition to appear? Assume a full adder incurs a 2-gate delay to generate the sum and a 3-gate delay to generate the carry out.

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter4: Processor Technology And Architecture
Section: Chapter Questions
Problem 23VE: A(n) _____ operation transforms a 0 bit value to 1 and a 1 bit value to 0.
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An 8-bit carry-select adder is given below. If the propagation delay for a gate is 2 nsec, how long does it take for the complete result [s7:s0] of an 8-bit addition to appear? Assume a full adder incurs a 2-gate delay to generate the sum and a 3-gate delay to generate the carry out. 

8-bit Carry-Se lect Adder
CO
A0
c in
SO
BO
Cout
C1
A1
Cin
S1
В1
Cout
C2
A2
Cin
S2
B2
Cout
C3
A3
C in
S3
B3
Cout
MUX
C4
S4
A4
A4
C in
504
S14
В4
В4
C Out
C5
C5
A5
AS
MUX
c in
S05
S15
SS
B5
85
Cout
C6
C6
A6
A6
S06
S16
MUX
B6
S6
B6
C7
A7
S17
A7
S07
MUX
87
B7
Ccut
57
C8
C8
十
Transcribed Image Text:8-bit Carry-Se lect Adder CO A0 c in SO BO Cout C1 A1 Cin S1 В1 Cout C2 A2 Cin S2 B2 Cout C3 A3 C in S3 B3 Cout MUX C4 S4 A4 A4 C in 504 S14 В4 В4 C Out C5 C5 A5 AS MUX c in S05 S15 SS B5 85 Cout C6 C6 A6 A6 S06 S16 MUX B6 S6 B6 C7 A7 S17 A7 S07 MUX 87 B7 Ccut 57 C8 C8 十
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Publisher:
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