at present, i am doing a project using 0.09um process with the main frequency of 200MHz, how to decide the pair numbers of VDD and GND? the package type is PGA288. In VDSM chip design, if have some procedures to design the numbers??
For the I/O supplies, you will need to make a calculation based upon the number of simultaneously switching outputs (SSO). Whoever supplies your I/O library should have some documents that describe this.
For the core, have you estimated the current consumption? You'll then need to find out what the electromigration limits are for the supply pads, and make sure you have enough so that isn't exceeded. Again- the docs for your I/O library should details this.