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Piccolo F28023 cannot connect



Hi alls,

i have build my own Piccolo board with a Sample TMX320F28023 because there is no such control card available right now.

but when i try to connect the debugger i get the following error:

Error:
Error 0x20001020/-1135
Severe Error during: Execution, Target,
Unrecoverable emulation error

-i am using XDS510LC as JTAG Debugger

-i measured the supply voltage directly on the pins and it seems to be ok    

-i also have a Piccolo F28027 with docking station and control card available.  Here i have no problems connectig with the CCS-Debugger

any suggestions?

thanks in advance.