Anti-fuses seem to be difficult to read even with electron microscopes. http://chipdesignmag.com/display.php?articleId=5045 http://chipdesignmag.com/display.php

Anti-fuses seem to be difficult to read even with electron microscopes. http://chipdesignmag.com/display.php?articleId=5045 http://chipdesignmag.com/display.php?articleId=5045