In some iSTART’s memory testing algorithms, they allow memories to do retention testing. For example,
March-RET algorithm is <(wb) (SLP) <(rb) >(wa) (SLP) >(ra)
Where (SLP) is sleep 1T.
If want to extend the retention time more than 1T, designer can assign the time to parameter “retention_time” in BFL’s BIST group settings.
For example,
BFL define{BIST}
……..
set retention_time = ##.##
…….
End define{BIST}
Where ##.## unit is micro second(us), for example 1.0 represent retention time is 1 us