create_generated_clock 是用来说明generated clock与source clock的相位(边沿)关系。同时根据source clock找到master clock以及source clock 和master clock的关系, 最终会确定generated clock和master clock的相位(边沿)关系。 在genereated clock的时候一定要明确generated clock与master clock的相位关系(rise->rise or ris...
create_generated_clock 需要指定源时钟(master clock)的master_pin,在CTS时,默认会去balance这两个时钟(即generated clock 和 master clock),让skew尽可能小。 而且在计算generated clock的clock latency时,会把从master clock pin 到generated clock pin之间的delay也考虑在内。 在工具中report_timing的时候,通过选项...
Create Generate Clock(create_generated_clock)约束使您能够定义设计中内部生成的时钟的属性和约束。您可以指定Clock name(-name),时钟派生的Sourcenode (-source)和Relationship to the source属性。对为修改时钟信号属性的任何节点定义生成的时钟,包括修改相位,频率,偏移或占空比。
create_generated_clock [-name clock_name] : 当不起名时,默认使用source第一port或pin做名字 [-add]:当同一个Port或pin需要增加两个时钟源时 port_pin_list: 此clock扇出的port pin -source master_pin : 相当于generated clock的input clock [-master_clock clock]: 当这个generated clock有多个时钟扇入时,...
.DIVCLK_DIVIDE(1), // Master division value (1-56) // REF_JITTER: Reference input jitter in UI (0.000-0.999). .REF_JITTER1(0.0), .REF_JITTER2(0.0), .STARTUP_WAIT("FALSE") // Delay DONE until PLL Locks, ("TRUE"/"FALSE") ...
create_generated_clock-name gen_clkin2-source[get_ports clk1]-multiply_by2-add-master_clock clk1_port[get_portsCLKIN2] 如果生成时钟的主时钟非实际主时钟,在Tcl Console窗口将会有如下告警提示,下方还有相应的解决方法Resolution CRITICAL WARNING: [Timing 38-249] Generated clock gen_clkin2 has no logic...
create_generated_clock -name {<constraint name>} [get_pins {<pin name>}] -source [get_pins {<opin name>}] -divide_by {1} -multiply_by {1} -add -master_clock [get_clocks {cnvr_fpga_bt_clk_switch_out}] What is the meaning of -master_clock [get_clocks {<clock name>}] in ...
create_generated_clock -name clks -source [get_ports CLK_FAST] -divide_by 32 [get_pins generate_ic_clocks/CLK_SLOW_reg/Q] Innovus gave me these errors when I do placeDesign: **ERROR: (TA-152): A latency path from the 'Rise' edge of the master ...
create_generated_clock -name <name> -source <source> -divide_by <ratio: 2,4,8, ...> -duty_cycle 50.00 <generated_clk> <name> a name assigned to the generate clock to be used in TQ analysis <source> the reference to your master clock <generated_clk> in your case this...
In the following example, the ODDR instance in the source device is used to generate the forwarding clock for the Source Synchronous interface. A user-defined generated clock needs to be created for the forwarding clock in order to be used in the set_output_delay constraint for the Source Syn...