https://community.nxp.com/t5/Powertrain-and-Electrification/Re-GD3162-BIST/m-p/2061333#M690 <P><SPAN>Hi Akshat,</SPAN></P> <P><SPAN>Yes, you should wait for the BIST to complete before reading the results.&nbsp;If you read the REQBIST register immediately after entering BIST mode, the test may still be running, causing the registers to return invalid or default values. So after setting the BIST bit, insert a 15ms delay in your code before reading the results.&nbsp;Or you can poll the BIST bit until it clears (indicating BIST has completed).</SPAN></P> <P><SPAN><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2025-03-13 141631.png" style="width: 593px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/327983iF34A3AE22B699D1F/image-dimensions/593x256?v=v2" width="593" height="256" role="button" title="Screenshot 2025-03-13 141631.png" alt="Screenshot 2025-03-13 141631.png" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">Screenshot 2025-03-13 141631.png</span></span></SPAN></P> <P><SPAN>BR, Tomas</SPAN></P> Thu, 13 Mar 2025 13:19:57 GMT TomasVaverka 2025-03-13T13:19:57Z https://community.nxp.com/t5/Powertrain-and-Electrification/Re-GD3162-BIST/m-p/2061126#M689 But is it needed to manually give a 15ms delay in the code after writing 1 to the BIST bit? Am I getting 3FF in all the GD registers data bits, because I'm reading the BIST results through REQBIST register just after entering into BIST mode? Could this be the reason? Thu, 13 Mar 2025 09:04:43 GMT https://community.nxp.com/t5/Powertrain-and-Electrification/Re-GD3162-BIST/m-p/2061126#M689 Akshat_VE02376 2025-03-13T09:04:43Z https://community.nxp.com/t5/Powertrain-and-Electrification/Re-GD3162-BIST/m-p/2061333#M690 <P><SPAN>Hi Akshat,</SPAN></P> <P><SPAN>Yes, you should wait for the BIST to complete before reading the results.&nbsp;If you read the REQBIST register immediately after entering BIST mode, the test may still be running, causing the registers to return invalid or default values. So after setting the BIST bit, insert a 15ms delay in your code before reading the results.&nbsp;Or you can poll the BIST bit until it clears (indicating BIST has completed).</SPAN></P> <P><SPAN><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2025-03-13 141631.png" style="width: 593px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/327983iF34A3AE22B699D1F/image-dimensions/593x256?v=v2" width="593" height="256" role="button" title="Screenshot 2025-03-13 141631.png" alt="Screenshot 2025-03-13 141631.png" /><span class="lia-inline-image-caption" onclick="event.preventDefault();">Screenshot 2025-03-13 141631.png</span></span></SPAN></P> <P><SPAN>BR, Tomas</SPAN></P> Thu, 13 Mar 2025 13:19:57 GMT https://community.nxp.com/t5/Powertrain-and-Electrification/Re-GD3162-BIST/m-p/2061333#M690 TomasVaverka 2025-03-13T13:19:57Z