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时钟关系如下图所示:
cts按正常flow做的,没有做什么特殊设置,但是做完后发现各个clock之间并没有balance,于是使用命令
balance_inter_clock_delay -clock_trees [clk_800M clk_Ch1_400M clk_Ch2_400M clk_Ph1_ch2_200M clk_Ph2_ch2_200M clk_Ch1_400M_sub_32_64_128_256_512_1024] -max_target_delay 0.4
得到的结果除了800M时钟,其余各个时钟都平衡了,如下:
Scenario : func_wc_cmax
Clock: clk_800M
Scenario: func_wc_cmax
Clock Pin Latency CRP Skew
----------------------------------------------------------------------------
u_clk/clk_Ch2_400M_reg/CLK 0.0234 wrp-+
u_clk/clk_Ch2_400M_reg/CLK 0.0222 -0.0000 0.0012 wrp-+
----------------------------------------------------------------------------
Clock: clk_Ch1_400M
Scenario: func_wc_cmax
Clock Pin Latency CRP Skew
----------------------------------------------------------------------------
u_tical_cal_Data1_reg_1_/CLK 0.9007 wrp-+
u_tical_cal_output1_reg_1_/CLK 0.8035 -0.0263 0.0708 wrp-+
----------------------------------------------------------------------------
Clock: clk_Ch1_400M_sub_32_64_128_256_512_1024
Scenario: func_wc_cmax
Clock Pin Latency CRP Skew
----------------------------------------------------------------------------
u_main_sys_Count_reg_14_/CLK 0.8507 wrp-+
u_main_timing_ctl_finish_reg/CLK 0.7788 -0.0270 0.0449 wrp-+
----------------------------------------------------------------------------
Clock: clk_Ch2_400M
Scenario: func_wc_cmax
Clock Pin Latency CRP Skew
----------------------------------------------------------------------------
u_tical_data_Gain_ch2_reg_4_/CLK 0.8930 wrp-+
u_tical_abs_Data_ch2_reg_47_/CLK 0.8072 -0.0276 0.0581 wrp-+
----------------------------------------------------------------------------
Clock: clk_Ph1_ch2_200M
Scenario: func_wc_cmax
Clock Pin Latency CRP Skew
----------------------------------------------------------------------------
u_tical_mul_1/dout_reg_28_/CLK 0.8388 wrp-+
u_tical_data_Gain_ch2_a_reg_32_/CLK 0.7483 -0.0244 0.0660 wrp-+
----------------------------------------------------------------------------
Clock: clk_Ph2_ch2_200M
Scenario: func_wc_cmax
Clock Pin Latency CRP Skew
----------------------------------------------------------------------------
u_tical_cal_Gain_b_reg_0_/CLK 0.7440 wrp-+
u_tical_mul_2/cof_reg_27_/CLK 0.6527 -0.0271 0.0642 wrp-+
----------------------------------------------------------------------------
请问这是为什么啊 |
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