TDA4VM: Some questions about LBIST

yuxin zheng

Part Number: TDA4VM

hi，

I would like to ask whether the final result of reading the hardware self-test state in the LBIST test in SDL is determined by the hardware or whether I can modify it by software

over 3 years ago

0 KB over 3 years ago

TI__Guru** 120721 points

Hi,

LBIST is a H/W diagnostic, that can be S/W initiated and have it's status checked via S/W,.

The build in self test, is documented at 4.4. LBIST : Logic Built-In Self-Test — Software Diagnostics Library (SDL) - J721E User Guide

The H/W results are checked at SDL_LBIST_selfTest.

Not following the request to "modify it by software". Is the intent to run a self test, on the LBIST test?

Thanks,

0 yuxin zheng over 3 years ago in reply to KB

Prodigy 70 points

hi KB,

I would like to ask if the objects tested in the LBIST test are the same in the hardware self-test and software test?

Thanks.

0 KB over 2 years ago in reply to yuxin zheng

TI__Guru** 120721 points

Hi,

I'm not able to follow what the question is asking. Could you please re-word, re-ask in a different manner, if question is not addressed below.

LIBST is a H/W diagnostic, which can be initiated by S/W (periodic / on-demand)

If question is regarding POST, DMSC LBIST and MCU LBIST would optionally be run on power up in hardware before the ROM code starts. The S/W initiated LBIST would be as described in SDL LBIST documentation.

Regards,

0 yuxin zheng over 2 years ago in reply to KB

Prodigy 70 points

Hi KB,

Does this mean that only DMSC and MCU R5 support hardware power-on self-check, and other instances can only be started by software? Does the LBIST of DMSC and MCU R5 support software startup?

Processors

Processors forum

TDA4VM: Some questions about LBIST