''defparam u_counter_seg.u_clk_gen.CLK_200HZ_CNT_MAX = 17'd24;"

tb中的这句话有什么作用？

为啥编译能通过，到仿真就不行了？

 # ** Error: (vsim-3043) C:/my FPGA peojects/count_seg/sim/testbench/counter_seg_tb.v(21): Unresolved reference to 'CLK_200HZ_CNT_MAX' in u_counter_seg.u_clk_gen.CLK_200HZ_CNT_MAX.
#         Region: /counter_seg_tb