What does summation EVEN and summation ODD exactly mean in truth table of IC 74180 which is used as a parity generator and parity checker?

Question

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.

don't forget that the IC is a parity bit generator ... so the output is a parity bit for the input bits — jsotola, Oct 02 '21 at 18:03

score 0 · Answer 1 · answered Oct 03 '21 at 19:43

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.

What does summation EVEN and summation ODD exactly mean in truth table of IC 74180 which is used as a parity generator and parity checker?

1 Answers1