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TMS320F2800157-Q1: TMS320F2800157-Q1 JTEG disconnection issue

Part Number: TMS320F2800157-Q1

Tool/software:

 I am using a TMS320F2800157EVM launch pad to connect to a TMS320F2800157-Q1 on a motor controller. JTEG is getting disconnect when I go to higher supply voltages from 24V to 48V.

Up to 30V it's working fine but for 48V I am not able to debug JTEG is getting disconnected.

We have tried 4 wire JTEG and  2 Wire JTEG, also tried with low TCK frequency, but still not able to resolve this issue. Please suggest. 

I monitored the reset pin XRSn during debugging