When I try perform a Readback operation on any device except the first one in the JTAG chain, I see the following message:
'<position number>': No file name specified...
'<position number>': Readback terminated.
PROGRESS_END - End Operation.
Elapsed time = 0 sec.
This is a known issue and is resolved starting with iMPACT 10.1 Service Pack 3.
The work-around for current version is to use the iMPACT in Batch Mode in a command prompt. For example:
setCable -port auto
ReadbackToFile -p <position number> -file <FileName>.mcs
Another work-around is to go back to 9.2i or earlier.