9’s compliment is nothing but subracting the given no from 9.So using a 4 bit binary adder we can just subract the given binary no from 1001(i.e. 9).Here we can use the 2’s compliment method addition.
9’s compliment of a BCD number
Published
ASIC IP FPGA RTL CHIP DIGITAL HARDWARE
ASIC FPGA Digital Design 