1.8.4 Using FHB

When FHB is enabled, an FHB instance is created on each clock domain of the design. Each FHB instance gates its associated clock domain. You can add a trigger signal (countB[0]) to a live probe and halt the design on the positive edge of the trigger.

When FHB is enabled, the following options are enabled on the Live Probes tab:

• Event Counter—Counts the transition of signals assigned to Channel A or Channel B through the Live Probe feature. This feature tracks events from the board. When the Event Counter is activated and a signal is assigned to Channel A, the counter starts counting the rising edge transitions. The counter must be stopped to get the final signal transition count. During the count, you cannot assign another signal to Channel A/Channel B or go to any other tab on the window.
• Frequency Monitor—Calculates the frequency of any signal in the design that can be assigned to Live Probe Channel A or Channel B. You can enter the duration of monitoring the signal. The accuracy of results increases as the monitor time increases. The unit of measurement is displayed in MegaHertz (MHz). During the run, progress is displayed.
• User Clock Frequencies—Shows the clock frequencies from the Clock Conditioning Circuit (CCC) block.

This section describes the following procedures:

• Use Event Counter
• Use Frequency Monitor
• Use User Clock Frequency
• Select FHB