It is important to ensure that the instrument being triggered has enough pre-trigger buffer memory to overcome this delay. We only want to trigger on read transactions targeted at address 9A. Figure 4 below is a representation of the intended trigger sequence as a flow chart. Enter the values 64FFand 0 as prompted. The diagram in Figure 1 depicts a common scenario for recording data with an external instrument.
This allows the AT1 or AT2 port on the front panel of the bus analyzer to be connected to the trigger input of an external instrument. Trigger template for single event repeated for N times consecutively Customize the trigger sequence We are now ready to customize the template for a specific requirement. This means the data byte must equal downpoad with a mask of FFh evaluate all bits on the data byte downllad position 0 the first data byte.
Trigger tab with completed conditions The original template was configured to evaluate 4 consecutive events, but we only need 3.
Figure 2 below shows two common trigger scenarios: From the menu, select Trace Trigger …. To access the templates, open the Trigger tab and click the New … button and a list of pre-made trigger sequences is available. Open the Trigger Interface Begin by opening the trigger definition interface. To open the trigger interface:.
Select the Monitor module by clicking the Monitor icon. Your browser does not support iframes. We are now ready to collect data to test the trigger!
Remember to use a generous pre-trigger buffer on external instruments The I2C Exerciser software is dependent on the non-real-time host PC OS to process the trigger sequence and send the trigger command back down to the bus analyzer hardware. The original template was configured to evaluate 4 consecutive events, but we only need 3.
For the second ELSEIF statement, we want the conditions to be met when the data byte does not equal 64hregardless of counter state. Define the conditions Now we should define our conditions. The next time the Monitor is run, the Trigger will be active. Click the Run icon to start the emulated devices. The Trigger tab should now resemble Figure 6 below.
Monitor window showing trigger event. How to Purchase Corelis Products. Trigger sequences are defined using an intuitive graphical user interface GUI composed of different conditional elements commonly familiar to engineers and technicians with logic analyzer and oscilloscope experience. The Trigger tab should resemble Figure 9 below.
arduino-info – LCD-Blue-I2C
This may be an intermediate state, a previous state, or the final trigger state. The signal will be driven to the inactive state at the beginning ;df the test, and then pulsed to the active state for approximately 0.
Make use of the master scripting function for testing your trigger Many events are infrequent, intermittent problems—if downloa event only happens every few days, it is important to test the trigger prior to gathering data.
Emulated master device definition. The window should resemble Figure 13 below. We will decrement the counter every time the desired set of conditions is tutoral.
The data byte needs to occur in sequence 3 times. Launch the I2C Exerciser software. Trigger tab with copied subtrees. For example, it may be useful to capture SERDES signals on a high speed scope or monitor a parallel bus using a logic analyzer after a specific event.
The tips below will help you get the most out of your bus analyzer. Depending on transaction load and host PC processing power, this may cause a delay between event and trigger. Load a template The software includes built-in templates for common trigger tasks. The list below covers the main components of the desired trigger sequence. Master emulation The CAS can be used to emulate the master that we will be evaluating—this is very useful for verifying the trigger script.