DigitalClock API

The constructors are used to specify the parameters of the clock. Synchronous events are usually connected to edges in the DigitalClock. Increasing the clock frequency is a common operation used to check if the logic design still meets all the constraints.

All signals below the clock are considered to synchronous to this clock when adding pulses to other signals. Jitter is not functional at this time and should be set to 0.0. It will be be used to model the accuracy of a clock in ppms.

The Constructors

DigitalClock(TimingAnalyzer taApp, String name, double freq, int dutyCycle, double riseTime, double fallTime, double jitter, double startDelay, String startState)

The signal height and space above are set to the default values.

DigitalClock(TimingAnalyzer taApp, String name, double freq, String startState)

The rise time, fall time, start delay, duty cycle, signal height, and space above are set to the default values.

Adding Clocks

addDigitalClock(DigitalClock dclk)

Adds a DigitalClock to this timing diagram. The DigitalClock instance is required as the argument.

timDiagram.addDigitalClock(myClock)

addDigitalClock(String name, double frequency, String startState)

Adds a DigitalClock to this timing diagram. It creates a new instance of a DigitalClock object.

Returns a Digital Clock object.

dclk = timDiagram.addDigitalClock("CLK25",25e6,"H")

addDigitalClock(String name, double frequency, String startState, int dutyCycle)

Adds a DigitalClock to this timing diagram. It creates a new instance of a DigitalClock object.

Returns a Digital Clock object.

dclk = timDiagram.addDigitalClock("CLK25",25e6,"H",40)

Changing Clock Parameters

setFrequency(double frequency)

Set the Clock Frequency. This can be used to test faster clocks in systems to see if the design meets the defined timing constraints.

dclk.setFrequency(50e6)

getFrequency()

Returns a double that equals the Clock Frequency.

currentFrequency = dclk.getFrequency()

setDutyCycle(int dutycycle)

Set the Clock Duty Cycle.

dclk.setDutyCycle(40)

getDutyCycle()

Returns an integer that is the clock duty cycle.

dutyCycle = dclk.getDutyCycle()

setJitter(double jitter)

Set the Clock Jitter. This can be used to model the clock accuracy in ppms. Currently, this is not functional and should be set to 0.0

getJitter()

Returns a double that is the Clock Jitter.

clkJitter = dclk.getJitter()

setStartDelay(double startDelay)

Set the Clock Start Delay. This can be used to shift a clock in time, so you can make a clock that is out of phase with another clock. A feature coming will link the clocks together.

dclk.setStartDelay(25.0e-9)

getStartDelay()

Returns a double that is the Clock Start Delay.

startDelay = dclk.getStartDelay()