In this circuit 8-input XOR and XNOR gates generate even and odd parity for the 8-bit data D7-D0. When the data has an odd number of 1s the output of the XOR gate is 1 while the output of the XNOR gate is 0. When the data has an even number of 1s the output of the XOR gate is 0 while the output of the XNOR gate is 1.
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