ISE在时序约束时详细步骤.针对高速时钟下的时序不满足时的设计.-ISE timing constraint in the detailed steps.

如何发现并解决FPGA设计中的时序问题OFFSET约束-How to find and solve the FPGA design OFFSET timing constraint problem

Xilinx时序约束文档，包括什么情况下使用时序约束、为什么要时序约束、如何进行时序约束等。-Xilinx timing constraint document, including under what circumstances the use of timing constraints, why should the timing constraints, how to carry out the timing constraint.