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TMS320F2810 Locks Out Programming - Anyone else seen this problem?

Other Parts Discussed in Thread: TMS320F2810

We've programmed many of these boards, but twice we have had the processor lock us out from programming.  It's a hard problem to reproduce, but we'd like to find the root cause.   Anyone else seen this issue on a TMS320F2810?

I'm using the XDS510USB from spectrum digital with Code Composer.

Here is the error message:

C28xx: Flash Programmer: Error erasing Flash memory

C28xx: Flash Programmer: Device is locked or not connected. Operation cancelled

C28xx: Trouble Writing Memory Block at 0xf6579 on page 0 of Length 0x13a

C28xx: GEL: File: application.out : Load Failed.

C28xx: Error: (Error -1041 @ 0xFFFFFF4C) The Emulator reported and error. Confirm
             emulator configuration and connections, reset the emulator, and retry the operation.
             (Emulation package 5.0.520.0)

C28xx: Trouble Halting Target CPU: (Error – 2062 @0x0) Unable to hald device. Reset the
             Device, and retry the operation. If error persists, confirm configuration, Power-Cycle

           the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation
             package 5.0.520.0)

C28xx: Power Failure on Target CPU

C28xx: Failed to remove the debug state from the target before disconnecting. There may
             still be breakpoint op-codes embedded in program memory. It is recommended that

           you reset the emulator before you connect and reload your program before you
             continue debugging.

Any ideas?