Measuring a control system response time

A logic device for measuring a control system response time of a second clock tree,

• wherein the second clock signal has been propagated from a first clock source through a second clock tree,
• wherein the second clock tree comprises a programmable delay line that induces a delay,
• wherein the first clock signal has been propagate from the first clock source through a first clock tree,
• wherein the logic device comprises a counter that is clocked by one of the first clock signal and the second clock signal,
• wherein the skew control unit measures a control system response time of the second clock tree and determining the second clock tree latency based on the control system response time,
• wherein measuring the control system response time of the second clock tree comprises measuring a skew between the second clock signal and the first clock signal and storing the skew,
• initiating a delay change of a delay induced by the programmable delay line and starting a time measurement,
• at least one iteration of
• measuring the skew between the second clock signal and the first clock signal;
• comparing the measured skew with the stored skew;
• based on the result of the comparison, stopping after a current iteration and stopping the time measurement, and
• wherein a result of the time measurement is the control system response time,
• wherein starting a time measurement comprises initializing and starting a counter, and
• wherein stopping a time measurement comprises stopping the counter.