Can Two 8-bit Adders Be Used to Construct a 16-bit 2's Complement Adder?

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SUMMARY

Two 8-bit adders can indeed be used to construct a 16-bit 2's complement adder. Each 8-bit adder processes two 8-bit operands along with a 1-bit carry input, producing an 8-bit sum and a 1-bit overflow output. By connecting the carry output of the first adder to the carry input of the second adder, the two adders can effectively handle the full 16-bit addition, accommodating the necessary carry propagation. This design allows for the seamless addition of 16-bit 2's complement numbers.

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16 bit 2's complement adder. Due tomorrow!

You are given two adders. Each adder has two 8-bit operand inputs
and a 1-bit carry input. Each adder calculates the sum of the two
8-bit 2's complement operands and the 1-bit carry and outputs an 8-bit
sum and a 1-bit 2's complement overflow bit. Can you use the two
adders to create a 16-bit 2's complement adder? If so, draw it (represent
the adders as boxes with clearly labeled inputs and outputs). If not,
explain why it is difficult.

Help please
 
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Yes. The drawing and wiring are left as an exercise to the student :-)

HINT:
1) What happens to the 10s place when you add 15 and 27? What happened to the 1s place?
2) What is the purpose of the carry INPUT?
 

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