...
Name | Description | ||
-name | Specifies the name of the clock. | ||
-period | 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: | ||
|
...
| Code Block |
|---|
create_clock –period 7 –waveform {2 4} [get_ports {clk3}] |
| Note |
|---|
Please not note that virtual clocks are not handled by NX flowNxmap. |
create_generated_clock
Creates a new clock signal from the clock waveform of a given pin in the design.
...
Name | Description | ||
-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: | ||
|
...
Name | Description | ||
asynchronous | Defines clock group with asynchronous clocks. Asynchronous clocks have no specified phase relationship. | ||
exclusive | Defines clock group with clocks that cannot exist in the design at the same time. | ||
group | Specifies a group of clocks. | ||
|
Examples:
| Code Block |
|---|
create_clock -period 10 -name "clk1" [get_ports clk_1] create_clock -period 12 -name "clk2" [get_ports clk_2] create_clock -period 15 -name "clk3" [get_ports clk_3] set_clock_groups -asynchronous -group [get_clocks clk1] -group [get_clocks clk2] set_clock_groups -exclusive -group [get_clocks clk1] -group [get_clocks clk3] |
...
Name | Description | ||
|---|---|---|---|
from | Specifies how to get a timing path starting points. A valid timing starting point is an input port or a register. A valid argument can be: | ||
to | Specifies how to get a timing path ending points. A valid timing ending point is an output port or a register. A valid argument can be: | ||
group | Specifies a group of clocks. Specify at least two clocks. | ||
|
...
Name | Description | ||
|---|---|---|---|
clock | Specifies the clock reference to which the specified input delay is related. This is a mandatory argument. | ||
clock_fall | Specifies that input delay is relative to the falling edge of the clock. When it is not set, the delay is applied on the rising edge of the clock. | ||
max | Applies value as minimum data delay, it refers to the longest path. The default value is max if the max is defined, otherwise it is set to 0. | ||
min | Applies value as minimum data delay, it refers to the longest path. The default value is max if the max is defined, otherwise it is set to 0. | ||
delay | Specifies the arrival time in nanoseconds or picoseconds that represents the amount of time for which the signal is available at the specified input after a clock edge. | ||
ports | Provides a list of input ports in the current design to which | ||
|
...
Name | Description | ||
|---|---|---|---|
clock | Specifies the clock reference to which the specified input delay is related. This is a mandatory argument. | ||
clock_fall | Specifies that input delay is relative to the falling edge of the clock. When it is not set, the delay is applied on the rising edge of the clock. | ||
max | Applies value as minimum data delay, it refers to the longest path. The default value is max if the max is defined, otherwise it is set to 0. | ||
min | Applies value as minimum data delay, it refers to the longest path. The default value is max if the max is defined, otherwise it is set to 0. | ||
delay | Specifies the arrival time in nanoseconds or picoseconds that represents the amount of time for which the signal is available at the specified input after a clock edge. | ||
ports | Provides a list of output ports in the current design to which | ||
|
...
Name | Description | ||
|---|---|---|---|
from | The argument which specifies how to get a timing path starting points. A valid timing starting point can be either an input port or a register. A valid argument can be: | ||
to | The argument which specifies how to get a timing path ending points. A valid timing ending point can be either an output port or a register. A valid argument can be: | ||
delay | The required minimum delay value in ns for specified paths. | ||
|
...
Name | Description | ||
|---|---|---|---|
from | The argument which specifies how to get a timing path starting points. A valid timing starting point can be either an input port or a register. A valid argument can be: | ||
to | The argument which specifies how to get a timing path ending points. A valid timing ending point can be either an output port or a register. A valid argument can be: | ||
delay | The required maximum delay value in ns for specified paths. | ||
|
...
Name | Description | ||
|---|---|---|---|
from | Specifies how to get a timing path starting points. A valid timing starting point is a register. A valid argument can be | ||
to | Specifies how to get a timing path ending points. A valid timing ending point is a register. A valid argument can be | ||
delay | The required maximum delay value in ns for specified paths. | ||
|
...