在Example of clock-as-data中 ,第一条路径是从toggle_clk (INVERTED)到clk,第二条路径是从toggle_clk到clk。由于沿路径的上升和下降时间不同,两种情况下的时序裕量(slack)略有不同。Data Delay列报告~5 ps的差异。只需要考虑具有最低时序裕量(slack)值的路径。Timing Analyzer仅报告两者之间的最坏情况路径(...
The generated clock information is also used to compute the slacks in the specified clock domain that drive optimization tools such as place-and-route. Exceptions None Examples The following example creates a generated clock on pin U1/reg1:Q with a period twice as long as the period at the ...
Renaming Auto-derived Clock Example Same example in Use Case 1: XDC constraint: create_clock -name clkin -period 10.000 [get_ports clkin] #renaming auto-derived clock cpuClk create_generated_clock -name user_clk [get_pins clkip/mmcm0/CLKOUT] ...
Example Usage # Create a clock and a divide-by-2 generated clock create_clock -period 10 [get_ports clk] create_generated_clock -divide_by 2 -source [get_ports clk] -name clkdiv [get_registers clkdiv] # An equivalent generated clock create_generated_clock -edges {1 3 5} -source [ge...
In this Timing Analyzer example, follow these options and descriptions to learn how you can use the create_generated_clock command to create generated clocks.
For example, is there a way to simplify this: create_generated_clock -name output_clock_0 -source \[get_pins DDR|ddio_outa[0]|muxsel] [get_ports clk_out] create_generated_clock -name output_clock_1 -source \ [get_pins DDR|ddio_outa[1]|muxsel] [get_ports clk_out] create_...
I guess that this is an example of how powerful, yet dangerous, the internet can be if you take as accurate information that you find there - ooops. As a novice, I was looking for a way to divide my source clock into a number of sub-clocks for a Z80 based system that I ...
When you create a generated clock on a node that ultimately feeds the data input of a register, this creates a special case of “clock-as-data." The Timing Analyzer treats clock-as-data differently. For example, if you use clock-as-data with DDR, you must consider both the r...
Example of clock-as-data When you create a generated clock on a node that ultimately feeds the data input of a register, this creates a special case of “clock-as-data." The Timing Analyzer treats clock-as-data differently. For example, if you use clock-as-data with DDR, yo...
I guess that this is an example of how powerful, yet dangerous, the internet can be if you take as accurate information that you find there - ooops. As a novice, I was looking for a way to divide my source clock into a number of sub-clocks for a Z80 based system that I ...