What is retention algorithm for memories?

[shakti_pattnaik]

I wanted to know about the retention algorithm used for memories. Can anyone give an idea on this as to how the memory is exercised and how the retention algorithm actually sees whether the memory retains a value?

 

[santhosh007]

retention test algorithm is similar to checkerboard except the waiting period. it verifis the that if the memory can retain the initial content for a period of time say 10-50ms depends on the process.
after a write, there is wait for retention and read back acn compare the content.