altpll function

It shows the clock to be assigned to pin W33. now when I check the datasheet for the location of W33, I cannot find the pin number. Is it a flaw in the datasheet?

The assignment for input signal is shown to be at AA33 which according to datasheet is a USB controller input pin.

When I try to set the assignment of input signal to a location I want that according to the manual supports LVDS input and has a SERDES circuitry, I receive the following error:

Error: Can't place differential I/O receiver pin inp in location B25 -- differential I/O pin requires dedicated I/O SERDES, but location does not have differential I/O receiver SERDES available

I am now confused how to assign the pins, and whether to trust the user manual of the fpga, or not