create_clock -period 10.0 [get_ports sysclk] 这条命令定义了一个周期为10ns的主时钟,该时钟连接到名为sysclk的端口。 2. 定义生成时钟(Generated Clock) 生成时钟是在设计内部由特殊单元(如MMCM、PLL)或用户逻辑生成的时钟。 xdc create_generated_clock -name clk_div2 -source [get_ports sysclk] -...
生成时钟 (generated clock) 是从称为主时钟 (master clock) 的另一个现有时钟衍生的。它通常用于描述逻辑块对主时钟执行的波形变换。由于生成时钟定义取决于主时钟特性,因此必须首先定义主时钟。为显式定义生成时钟,必须使用create_generated_clock 命令。 自动衍生时钟 大部分生成时钟都是由 Vivado 时序引擎自动衍生...
create_generated_clock -name clk0mux -divide_by 1 \ -source [get_pins mux/I0] [get_pins mux/O] create_generated_clock -name clk1mux -divide_by 1 \ -add -master_clock clk1 \ -source [get_pins mux/I1] [get_pins mux/O] set_clock_groups -physically_exclusive -group clk0mux -...
create_generated_clock -name clk_sck -source [get_pins -hierarchical *axi_quad_spi_0/ext_spi_clk] [get_pins STARTUP/CCLK] -edges {3 5 7} set_input_delay -clock clk_sck -max 7 [get_pins STARTUP/DATA_IN[*]] -clock_fall set_input_delay -clock clk_sck -min 1 [get_pins START...
create_generated_clock -name Clkout -source [get_pins ODDR_inst/C] -combinational [get_pins ODDR_inst/Q] random postings from Xilinx forums Leave a reply This finds all the cells of a certain type but it doesn’t check if the CE is connected to VCC ...
I'd like to be able to program a clock signal to be used internally for clocking other RTL blocks inside a Stratix FPGA. I have a 500 MHz system clock generated by an internal PLL and would like to use this clock to generate a slower clock based on the user-input value (...
parameterN2 =2;parameterN3 =1;parameterN4 =2;//-- Wire with base clock signal: the output of prescaler 0wireclk_base;//-- Base prescaler. Connected to the input clock signal//-- Its output is for clk_base//-- It's N0 bits wideprescaler#(.N(N0))Pres0(.clk_in(clk_in),.clk_...
moduletoplevel(clock,reset);inputclock;inputreset;regflop1;regflop2;always@(posedgeresetorposedgeclock)if(reset)beginflop1<=0;flop2<=1;endelsebeginflop1<=flop2;flop2<=flop1;endendmodule 运算符“⇐” 在Verilog中体现了与普通的程序语言不同的地方,它被称为“非阻塞赋值”.每一个赋值与其在程序...
1. Create a top module that has clk and reset as input and has two outputs call them clk_out1 and clk_out2. The module creates two instances of the clock module clk_div that we created above. One will divide the clock by 10 and other will divide it by 20. Create test bench to ...
(posedge clock)); initial structures may also not be converted. If you do not specify the bit width of the number, the system may default it to a larger value (such as 32 bits), which may result in a very large logic gate-level netlist, some of which are unnecessary, which will ...