create_generated_clock -name clk_div -source [get_ports clk] -divide_by 2 [get_pins rega/Q] 意思是在rega单元的Q引脚上的时钟信号clk_div是由clk经过2分频得到的生成时钟。 时钟源是引脚: create_generated_clock -name clk_div -source [get_pins rega/C] -divide_by 2 [get_pins rega/Q] 除...
create_generated_clock -name clk_div -source [get_ports clk] -divide_by 2 [get_pins rega/Q] 意思是在rega单元的Q引脚上的时钟信号clk_div是由clk经过2分频得到的生成时钟。 时钟源是引脚: create_generated_clock -name clk_div -source [get_pins rega/C] -divide_by 2 [get_pins rega/Q] 除...
此答复记录列出了 create_clock 约束和 create_generated_clock 约束的常见用例和常见问题。 Solution create_clock 常见用例 (答复记录 64340)Vivado 约束 - create_clock 约束的常见问题解答 (答复记录 59799)Vivado 约束 - 在限定范围的约束文件中使用 create_clock 约束时,如何避免覆盖时钟约束?
Generated clocks are driven inside the design by special cells called Clock Modifying Blocks (for example, an MMCM), or by some user logic. The XDC command "create_generated_clock" is used to create a generated clock object. Syntax:
69583 - Vivado Constraints - create_clock/create_generated_clock Master Answer Record Description This Answer Record lists the common use cases and common issues of create_clock and create_generated_clock constraints. Solution Common Use Cases of create_clock (Xilinx Answer 64340) Vivado Constraints ...
Workaround: Specify master_clock in the generated clock constraint. create_generated_clock -name lvds_clk -add -master_clock clk480 -source [get_pins U_lvds_out_x8/inst/clk_fwd/CLK] -multiply_by 1 [get_ports clkout_p] The issue has been fixed in Vivado 2017.1 and later versions. URL...
create_generated_clock -name clk_mux2_1 -source [get_ports clk1] -divide_by 1 -add -master_clockclk2[get_pins BUFGMUX_inst2/O] In this constraint, the master clock name (clk2) is incorrect, which does not match the clock source port (clk1). ...
36 Vivado约束设计基本流程 37 Vivado约束设计基本流程 XDC文件中的时序约束主要包括如下四 个部分: Create Clocks; 主时钟;create_clock 虚拟时钟;create_clock Input /Output Delays; 衍生时钟; create_generated_clock 错误路径;set_false_path Clock Groups and CDC; 时钟不确定性; 最大、...
>create_clock-name sysClk-period10[get_portsCLK0]>set_input_delay-clock sysClk4[get_portsDIN]>set_output_delay-clock sysClk1[get_portsDOUT] 例5:此示例指定相对于DDR时钟的输入延迟值。 代码语言:javascript 复制 >create_clock-name clk_ddr-period6[get_portsDDR_CLK_IN]>set_input_delay-clock...
X-Ref Target - Figure 1-3 Run Synthesis Review options & HDL code 第 1 章: 引言 report_clock_networks -> create_clock / create_generated_clock report_clock_interaction -> set_clock_groups / set_false_path check_timing -> I/O delays report_timing_summary -> Timing exceptions Define & ...