Honored Contributor
Honored ContributorAltera often use the same JTAG ID for multiple devices. This seems to be becoming more common with more device families and variants being brought to the market. Engineering samples often deliberately have different JTAG ID's to the production parts.
However, Altera don't use multiple JTAG ID's for the same device - what you're seeing. Can I assume you reliably read the same - incorrect - JTAG ID from the board? This isn't an intermittent issue? Perhaps the least likely explanation given the nature of the misread JTAG ID, but manufacturing faults do show up in strange ways. Could this be a device that failed manufacturing test? These devices have been known to make it onto the market. Follow up with the supplier that supplied the parts. Could these parts have come off the grey market? Is this design registered with Altera? If so, I'd get in touch with your local Altera FAE and ask them to follow up with Altera. In fact, I suggest you get in touch with them anyway. Cheers, Alex
