Attention:
	1. for quickly simulation, please in the ../../project/src/ddr_phy_interface/temp/DDR1_PHY/gwmc_param.v file,
        add below:
	   `define SIM

../project/src/*.v : 
                        test design for DDR1 ip
../project/src/ddr_phy_interface/ddr_phy_interface.vo :
                        DDR1 IP
../tb/tb.v :
                        testbench for simulation
prim_sim.v:             simulation library, get from installation path of gowin YunYuan Software
