cpu模型，除了时序和显示模块，有两个warning-A CPU module except downloading parts,such as SHIXU and XIANSHI.This version has 2 warning as below.But functional waveform shows

--a right execution of computing.　　　　　 --ZHANG Hongjie 2010.6.11　

--　　　　Warning: Inferred dual-clock RAM node "ram8~17" from synchronous design logic.　

--　　　　　　　　　　The read-during-write behavior of a dual-clock RAM is undefined and may not match the behavior of the original design.

--　　　　Warning: Inferred dual-clock RAM node "ram8~18" from synchronous design logic.　

--　　　　 　　　　　　The read-during-write behavior of a dual-clock RAM is undefined and may not match the behavior of the original design.