Error in connecting ezDSP F2812

Which version of CCS are you using? And how are you setting up the CCS connection to target - via eZdsp onboard emulation or external JTAG emulator?

This wiki page has some details and tips on troubleshooting common JTAG connection issues such as the one you are experiencing. Please take a look at this as well and see if it helps: http://processors.wiki.ti.com/index.php/Debugging_JTAG_Connectivity_Problems

Thank you for your valuable reply.

I am using CCSv3.3. I am using Spectrum Digital's eZDSP which is having on-board JTAG emulation with parallel cable.

The following is the configuration of target eZdsp with CCS:

1.First configure Parallel Port in EPP mode in BIOS settings.

2.On desktop opening SDConfig shortcut and select 378 series and then set Emulator port mode as EPP mode.

3. Adding eZdsp F2812 in setup CCS 3.3version.

If the JTAG IR scan test fails and you cannot verify the connection with the SD Config tool then it should be something related to the emulator cable or eZdsp. See the FAQ on Spectrum Digital's website for more suggestions: http://support.spectrumdigital.com/guides/JTAG_Emulator_guide. You might also want to check with Spectrum Digital in case they have other suggestions for things to check.

If the device is in a socket, check that it is seated properly and some pins didn't become disconnected.

If you have another board to test can you confirm that it isnt the cable that is faulty?

You mentioned this set up working before. What, if anything, changed between then and when it stopped working?

The device in the socket is seated perfectly. I also checked the same board in another PC then also its not working. That means their is no fault in Cable/Software/Chip. I doubted on the board itself. 

I told you that earlier its working. When its working I am arranging the PWM pins to connect to Digital Storage Oscilloscope (DSO), I think that time the PWM pins are shorted. Any way I used a opto-coupler circuit at the output of PWM pins. Since I observed the output of opto-coupler on DSO, I think even if their is a short at the output of opto-coupler circuit that will not effect the board PWM pins. But I also checked the ADCs input on DSO. Do you think this created any problem fails to JTAG IR scan test.

Thank you.

I am not a hardware expert, but it is possible that the board itself has somehow become faulty. If you wish, you can start a new post in the C2000 forum to see if the experts there might have additional suggestions for checking if the board itself is faulty.