hi, i was trying 2 interface SST flash 39vf400a external flash located at 0x000000. however, while debugging i'm using a initialization file wherein i point PC to internal 8k SRAM address(0x10000000) it works fine.So i'm able to run programs where flash memory is not needed. But if want to erase sector of flash & try to "step through" the code which the SST flash site has provided i am not able to do so.if anybody could help me i would be very much greatful. Thanks & regards Renuka Prasad