What's the checksum method used to test??

Question

FPLA, ROM, EEPROM or RAM

Answer 1

Checksum is a crude way to verify that the data received is the same data sent.  The sum of the 1s or 0s is added up and the total sent along with the data.  If they match, the data is good.

There are better ways that correct the data if it is defective, but that takes a lot more overhead.

Answer 2

usually used to check that data arrived correctly,

Checksum, Parity bit, and CRCC are all methods, some better than others, used to check data.

Checksum is usually the sum of a bunch of data words. The Checksum is precalculated and sent along with the data. At the receiving end, the checksum is recalculated and compared with the transmitted value. If they are equal, then you have good assurance (but not perfect) that the data arrived correctly.

Checks of some sort or other are used on all internet transmissions, on CD and DVD data, for just a few examples.

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