When carrying out a Verify on a Spartan-6 FPGA in a chain with multiple devices I see messages similar to:
'4': Verifying device...INFO:iMPACT:2495 - Readback Size is 19623184.
INFO:iMPACT:396 - Readback to map unsuccessful.
INFO:iMPACT:395 - The number of difference is -1
'4': Verification terminated.
LCK_cycle = NoWait.
LCK cycle: NoWait
'4': Programming terminated due to errors.
My device is programmed correctly and DONE has gone high. Why do I see these messages?