"Connect to PRSC failed" error with CCSv4.2

Amitkumar,

Which version of CCS you are using? Also, are these boards all EVMs or custom boards? Also, which emulators are you using to connect to these boards?

PRSC is a DLL that loaded and used by the TI emulation software that provides parent status for a processor.  In certain devices it requires to read some registers from the emulation circuitry inside the device. If it failed to read the registers or the registers contained unexpected values then that could cause the error message you are seeing. 

Per your description it seems the connection to the emulator is not entirely stable, since you can connect to the target at certain times.

Therefore I would check the General IDE and the Debugger troubleshooting steps in the page below to be sure:

http://processors.wiki.ti.com/index.php/Troubleshooting_CCS

The next step I would do is reduce the speed of the JTAG clock. Check the quick tip below that shows how to do this:

http://software-dl.ti.com/dsps/dsps_public_sw/sdo_ccstudio/CCSv4/Demos/ccs4-setup2_b5.htm

Also, you can try to connect to each core individually and check its status via the ICEPICK device. Check the quick guide and the page below for details:

http://software-dl.ti.com/sdo/sdo_apps_public_sw/CCSv4/Demos/Using_ICEPICK/Using_ICEPICK.html

http://processors.wiki.ti.com/index.php/CCSv4_Getting_Started_Guide#Advanced_target_configurations

If nothing helps, we may need to obtain additional log information.

Best regards,

Rafael