How to use ipad Simulator for debugging?

I installed iphone_sdk_3.1.3_with_xcode_3.2.1_snow_leopard

But there is only iphone Simulator, but I want to do is ipad application, how to set up?
Reply:
ipad SDK 3.2 is only something, right? Installing a higher version of xcode it
Reply:
After downloading the sdk 3.2 bar, 3.1 does not provide ipad simulator, but you look at the application in iphone too, can run on the same after the release of ipad, the ipad is not visible in the simulator only real effect;