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Truth Table of IC 74180 as given on ti.com

I was trying to implement parity generator for 8 bit message using IC 74180. I understand the purpose of all the pins but don't what do those two output pins namely summation(Even) and summation(odd) mean? I couldn't find any clear explanation anywhere else.

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  • $\begingroup$ it is sum ... the sum of 1 bits $\endgroup$
    – jsotola
    Oct 2 at 17:54
  • $\begingroup$ don't forget that the IC is a parity bit generator ... so the output is a parity bit for the input bits $\endgroup$
    – jsotola
    Oct 2 at 18:03
  • $\begingroup$ Doesn't the truth table give it to you? $\endgroup$ Oct 3 at 19:31
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The word-length capability is easily expanded by cascading.

Even and Odd come from a previous 74180 to allow more than 8 bits of parity.

∑Even will be true if all 8 bits AND Even are an even number. Even true + 00000000 means ∑Even is true.

Even false + 00000001 means ∑Even is true. Odd parity from previous sections and odd parity in this section means even parity.

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