The SUMf output bit will be set if the number of input bits set to 1 is odd. Thus the SUMf output can be generated by a three-input Exclusive OR (XOR) gate.
The carry output (COf) bit will be set if two or all of the input bits are 1s. Then, a three-input majority voting logic circuit can be used for carry output.
Variables / Signal Names:
CI = Carry Input
AG = Augend
AD = Addend
SUMf = (Full adder) Sum
COf = (Full subtractor) Carry Output
For Full Subtractor:
https://www.multisim.com/content/TR3Ck3HsJXpwcZ3iuYQjzR/full-subtractor/
For Half Adder:
https://www.multisim.com/content/6dKQmpwSCnJ3naa3kf9JDD/half-adder/
For Full Adder Using Two Half Adders:
https://www.multisim.com/content/cu38wufkNopY7q3DbNxMhj/full-adder-using-two-half-adders/
For Configurable-Mode Full Subtractor/Adder:
https://www.multisim.com/content/gwds95xFpmG5tfsUC5GzeH/configurable-mode-full-subtractoradder/
For Simultaneous Dual Function Half Adder-Subtractor:
https://www.multisim.com/content/MoUhGPsqRXjNsmYbzrMahn/simultaneous-dual-function-half-adder-subtractor/
For Configurable-Mode Full Subtractor/Adder Using Half Subtractor/Adder And Half Adder:
https://www.multisim.com/content/7f3C4LtEzu8adz9gefm5yf/configurable-mode-full-subtractoradder-using-half-subtractoradder-and-half-adder/
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