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Error in erasing flash

Other Parts Discussed in Thread: TMS320F28026, UNIFLASH

Hi!

I am working on TMS320F28026/27. We have made one application specific board.

I am trying to Load the program in the chip. But while programing I am getting an error as:

Flash Programmer: Error erasing Flash memory.
Flash operation timed out waiting for the algorithm to complete. Operation cancelled.
Trouble Writing Memory Block at 0x3f6000 on Page 0 of Length 0xcef  Cannot write to target.

I have checked the target settings and XDS100 USB Docket station.

The first stage of Connecting to the target is executed very fast and some times it is erasing the sector A of the flash memory , but after that I am getting the error mentioned above.

It is difficult for us to make out that error is from the H/W or because of the missing any step during programming.

Please help me to sort our the issue if somebody is having any clue.

Regards and Thanks in advance,

Richa