Pls look at the Altera EPM7128SQC100-10N part marking
Should there be the marking from the bottom side?
And the topside and the bottomside marking are defferent.
Best regards and thank U
As SooYL mentioned, Intel doesn't support part marking verification on Altera products. I'm sorry about that. You'll need to take it back to the place you purchased it. I did a search on the company name on your receipt, and "Altera International Limited" is NOT the same as Altera International, Inc. or Altera Corporation. It is a privately held company and Intel has no affiliation with them. I hope that helps.