...
In order to match with all registers, it is possible to specify empty string ('') for parameters from_list or to_listsource or target SHOULD be set to empty.
setFalsePath(source = ‘source', target = 'target’)
...
In order to match with all registers, source or target can SHOULD be set to empty.
setInputDelay(clock, clock_mode, minimum_delay, maximum_delay, port_list)
...
This method gives the shortest and the longest delays of a path. This constraint is used by timing driven algorithms and static timing analysis.
Timing log files will only contain paths found between sources and targets from these queries.
Arguments:
Name | Type | Description |
|---|---|---|
source_reg | string | Specifies the starting points of the timing paths to be analyzed. A valid argument can only be a register : |
target_reg | string | Specifies the ending points or destination objects of timing paths to be analyzed. A valid argument can be: |
...
This method is used before launching a Static Timing Analysis or using TimingDriven:
| Code Block |
|---|
p.createClock(target=getClockNet('clk1'),name='clk1',period=20.000,rising=0,falling=10.000) #Clk1 is created with 50 MHz frequency
p.removeDesignConstraint(1)
p.createClock(target=getClockNet('clk1'),name='clk1',period=40.000,rising=0,falling=20.000) #Clk1 is now with 25 MHz frequency |
...
This method is used before launching a Static Timing Analysis or using TimingDriven:
| Code Block |
|---|
p.createClock(target=getClockNet('clk1'),name='clk1',period=20.000,rising=0,falling=10.000) #Clk1 is created with 50 MHz frequency
p.resetTimingConstraints() |
addReportPath(source = ‘source_reg', target = 'target_reg’)
This method gives the shortest and the longest delays of a path. This constraint is used by timing driven algorithms and static timing analysis.
Timing log files will still contain all paths. In addition, A file is create with shortest and longest paths found between sources and targets from each query.
Arguments:
Name | Type | Description |
|---|---|---|
source_reg | string | Specifies the starting points of the timing paths to be analyzed. A valid argument can only be a register : |
target_reg | string | Specifies the ending points or destination objects of timing paths to be analyzed. A valid argument can be: |
Example:
This method should be launched after creating an Analyzer, as follow :
| Code Block |
|---|
Timing_analysis = p.createAnalyzer()
Timing_analysis.addReportPath(source = 'getRegister(i_cpt_0|s_cpt_out_reg[1])', target ='getRegister(i_cpt_1|s_cpt_out_reg[2])')
Timing_analysis.launch() |