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Transparent Galpat test algorithm

hi all,

i would like to use the transparent galpat for a ram test. the test is specified in the iec61508-7. there it says:

the first step of transparent galpat is to select a cell of an address and then calculate a signature s1 of the remaining cells. then the selected cell is inverted and another signature s2 is calculated. if s1 and s2 are equal, there is no failure.

my problem is the calculation of the signatures. Can anyone figure how this works?

Regards,
aei