不是or3b2是or2b2，写错了！！！

OR2B2
Primitive: 2-Input OR Gate with Inverted Inputs
Introduction
OR functions of up to five inputs are available in any combination of inverting and non-inverting inputs. OR
functions of six to nine inputs, 12 inputs, and 16 inputs are available with only non-inverting inputs. To invert
some or all inputs, use external inverters. Because each input uses a CLB resource, replace functions with unused
inputs with functions having the necessary number of inputs.
Design Entry Method
This design element is only for use in schematics.
For More Information
See the Spartan-6 FPGA User Documentation (User Guides and Data Sheets).
Spartan-

这里面很全

在spartan6的文档中我没有看到！！！可以说的具体那个文档吗？

看看去。