Define retention time
Posted: 21 Apr 2021, 08:32
In some EZ-BIST’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) indicates sleep time and unit is 1T.
If want to extend the SLP time more than 1T, designer can specify the retention 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 represents retention time is 1 us
March-RET algorithm is <(wb) (SLP) <(rb) >(wa) (SLP) >(ra)
Where (SLP) indicates sleep time and unit is 1T.
If want to extend the SLP time more than 1T, designer can specify the retention 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 represents retention time is 1 us