SPRUJ28F November 2021 – August 2025 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
During LBIST run-time execution, the block under test by LBIST must be isolated from the remainder of the design so as not to negatively impact the operation of other areas of the SoC. This is accomplished by logically isolating the block under test. LBIST requires that the block inputs be isolated for LBIST macro operation (i.e. the inputs need to be in a deterministic state to obtain coverage). The block outputs need to be isolated so that the LBIST operation does not corrupt other logic in the SoC dependent on the outputs of the block being LBISTed.