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In CHKB you have to write 1's to the 1st location of memory, 0's to next location of the memory, 1's to the next location, 0's to the next.....Once you complete writing to the whole memory, go to the 1st location and write the opposite value i.e. 0's, 1's to the next and so on.
ICHKB is just the opposite of CHKB. In ICHKB, start with 0's to the 1st location, 1's the the next and so on..Again after the complete memory is filled go the 1st location and write 1's which is the opposite value. This way completely fill the memory.
It is way of testing out the memory cell by stoing a 10-10 pattern in the memory array, so as to induce maximum stress on the cell. With this kind of pattern a defective cell will have a charge loss or charge gain and the data on the cell might get altered which are caught during subsequent testing.