What is checksum ??

[arunb]

Hi,

What is a checksum ?? and what is it used for ???

thanks
arun
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This message was ported from CCS's old forum
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[Sherpa Doug]

:=Hi,
:=
:=What is a checksum ?? and what is it used for ???
:=
:=thanks
:=arun

In its simplest form it is the sum of all the preceeding data, usually modulo 1 byte. There are also other methods more sophisticated then simple summation such as CRC.

The purpose is to check the integrity of the preceeding data. When data is sent from one place to another, such as between computers or between a CPU and RAM, the transmitter can generate a checksum and append it to the data. The receiver then generates its own checksum as the data arrives and compares its checksum with that sent with the data. If the two do not agree there must have been an error in transmission.

To find more do a search on checksum, parity, CRC, and ECC.


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