SPRUJ28F November 2021 – August 2025 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The Logic BIST Controller contains a Pseudo Random Pattern Generator (PRPG) and a Multiple Input Signature Register (MISR). The PRPG creates pseudo-random scan in data to drive the block’s scan chains, and the MISR captures the scan out data and creates a signature based on this data. At the end of the test, the signature is compared with the expected signature value to determine if the test has passed or failed.
Each H/W module with Logic BIST has a standard Logic BIST Interface that is connected to the central Logic BIST MMR block. Control signals from the central MMR block fan out to all of the sub-chips, and status signals from the sub-chips back to the central MMR block connect to dedicated ports on the MMR block.
Logic BIST execution can be controlled by writing and reading registers in the MMR block. In a secure device, this MMR access will be limited by the SMS. An interrupt (generated by the MMR block) is sent back to the system when the LBIST execution is complete. The system processor can then use the MMRs to read the LBIST MISR signature and verify that the LBIST execution passed
Figure 12-515 shows the details of submodules with LBIST.
Figure 12-515 LBIST Submodules