AMD Physical Design Engineer interview questions

Applied online, get contacted by email, phone arranged in 1 day. Basic question of resume and simple logic and layout questions. What is your relevant technical experience in this area? Setup hold time, transistor size, glitch reduction

Applied through a former co-worker. Got a call from hiring manager. It was a quick 30 min phone interview. After this, got invited to on-site interview. On-site interview was not tough, except for few difficult ( for me ) technical questions. I could answer 80=90 %. But sometimes I found it hard to understand why some interviewing persons tone was as if you have done something wrong, just because you went there to get interviewed, and they are the boss of you now. I found it hard to understand why a candidate must be treated as if he/she is inferior person than person at AMD. I felt sometimes that tone of person interviewing was hostile without any provocation. At least to me it seemed odd. But once I got over it, it was ok. Also some people and AMD were very good in treating you with common courtesy/good manners.