[TetraMAX] Empty box and black box in TMAX ATPG

[maulin sheth]

Hello All,
What is the difference between Black box and empty box terms which are used in TMAX ATPG?

Thanks & Regards,
Maulin Sheth

 

[rca]

From my remember, one ignore the pins direction.

 

[maulin sheth]

Hello rca, I can't get what you want to say...pl elaborate it..

 

[rushabh007]

Black box terminates the block inputs
and connects TIEX primitives to the outputs. Thus, the block outputs are unknown (X) for ATPG.
An empty box is the same as a black box, except that the outputs are connected to TIEZ rather
than TIEX primitives. Thus, the block outputs are assumed to be in the high-impedance (Z) state
for ATPG.

In certain cases, Black Box model can cause
contention, thereby preventing patterns from being generated for logic outside of the black box.
In these cases, the empty box model is a better choice.