Have posted the below response to your other post.
You have the option to give an address to the officer at landing. If you do not have a permanent address at that time, then the immigration officer will advise you on how to provide it later.
You have to provide an address within 180 days. If for any reason you do not supply an address after 180 days, the PR card application will be cancelled (application only - not your PR status), and you will need to re-apply for a new PR Card and pay the fees for this (currently $100 if I remember correctly).