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Name | Description |
-add | Allows to specify multiple clocks on the same source for simultaneous analysis with different clock waveforms. Not supported by Nxmap |
-name clock_name | Specifies the name of the clock. |
-period float | Specifies the length of the clock period. |
-waveform | Specifies the rise and fall edge times of the clock waveform over one clock period. The first value corresponds to the first rising transition after time zero. The numbers should represent one full clock period. |
source | The query which specifies how to get a clock related point. A valid query can be: |
Examples:
The following example creates two clocks on ports clk1 and clk2 with a period of 8, a rising edge at 0, and a falling edge at 4:
...
[-divide_by integer]
[-duty_cycle integer float]
[-edge_shift integer float list]
[-edges integer list]
...
[-source {port | pin}]
<target>
Arguments:
Name | Description | ||
-add | Allows to specify multiple clocks on the same source for simultaneous analysis with different clock waveforms. Not supported by NXmap | ||
-master_clock | Derives the generated (target) clock from the specified clock. Must be used with | ||
-divide_by | Determines the frequency of the new clock by dividing the frequency of the source clock by this factor. The value must be greater or equal to 1. Default value is 1 | ||
-duty_cycle | Specifies the duty cycle (high pulse width) as a percentage of the clock period. The range must be between 1 and 99. Default value is 50.0 | ||
-edge_shift | Specifies how much each edge specified with the | ||
-edges | Selects a list of edges from the source clock that form the edges of the derived clock. You must specify an odd number of edges. The last edge represents the first edge of the next clock period.
| ||
-invert | Inverts the resulting waveform of the generated clock. | ||
-multiply_by | Determines the frequency of the new clock by multiplying the frequency of the source clock with this factor. The value must be greater or equal to 1. Default value is 1 | ||
-name | Specifies the name of the generated clock. | ||
-offset | Specifies the offset for the rising edge. | ||
-phase | Specifies the phase of the generated clock. The range must be from 0 to 359 | ||
-source | Specifies the name of the pin from which the clock must be derived. A valid argument can be: | ||
target | Specifies how to get a clock related point. A valid argument can be: |
Examples:
The following example creates a generated clock on pin register_1 with a period twice as long as the period at the reference port clock
| Code Block |
|---|
create_generated_clock –divide_by 2 –source [get_ports {clock}] [get_registers {register_1}] |
The following example creates a generated clock at the pin ck with a period ¾ of the period at the reference port clock
| Code Block |
|---|
create_generated_clock –divide_by 3 –multiply_by 4 -source [get_ports {clock}] [get_nets {ck}] |