Categorising Devices – Automatic Suggestions

You have seen that XJDeveloper was able to suggest the correct model to use when categorising the resistors in the previous step. The nature of these devices meant that the same model could be used for all the devices in each suggestion group. Because this project contains BOM information, XJDeveloper can not only make suggestions about which category devices should be put in, but in many cases it can also suggest which models from the installed libraries should be used to describe those devices.

XJDeveloper will now display the Suggested Categorisation dialog.

The Suggested Categorisation dialog shows the following columns:

• Reference – lists the components that have been matched with a device model. If a model is not found for a component then the device will not be listed. Because you selected to display the BOM Part Number, each component also displays that information next to the reference (in parentheses).
• Assign As – displays the category the device will be put into. The dropdown list can also be used to mark the device as Ignored or Unfitted.
• Definition – displays the model that the device has matched. If the device matches multiple device models then Select will be displayed with the cell highlighted, and the dropdown list will allow you to select the correct match.
• Configuration – allows you to set device specific configuration options. In this case, XJDeveloper has preselected configuration options for most devices based on the information available from the BOM file. You will need to manually configure the options for U12.
• Assign – shows which devices are to be categorised when OK is clicked. If a definition has not been selected then the checkbox for that device will not be enabled.

U12 can operate in SPI or I²C so you need to set the configuration values to let the system know which mode should be used.

You can see that the board has been designed to use the I²C interface, so the configuration must be set to let XJDeveloper know this.

The device U11 is an I²C device with an address set by the values on the relevant pins. The configuration required for the XJDemo board has helpfully been written on the schematic.

With all of the configuration values now set you can make the assignments that have been suggested.

When you accept the device suggestions, XJTAG will make a copy of the models being used from the libraries and save them to files in your project directory. This will allow you to view and edit them if you wish, and means that if you transfer the project to another PC with a different version of the XJEase library, the project will work in exactly the same way.

Additional Uncategorised Devices

Among the 21 devices which have still not been categorised is the resistor R40. This was not present in the list until now, but categorising the logic devices in the circuit has now given XJDeveloper knowledge of how to access this component. It is quite normal that categorising devices will sometimes result in more devices that need to be categorised.

The remaining devices will be categorised in the following steps of the tutorial. Although the assignment suggestions are very helpful, you will almost certainly be required to manually categorise at least some devices when you are setting up XJTAG projects, and so in order to demonstrate this process you will manually assign the rest of the accessible devices.

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Reviewing Test Coverage

Not only has the number of pins being tested increased, but the total number of pins has actually decreased. This decrease is caused by the devices that have been categorised as Unfitted Devices. The increase in the number of Tested pins has come from two sources:

• The Connection Test can now include more nets as it now knows about all devices on those nets.
• The files used to categorise Test Devices contain information about the coverage that is added by running the tests they provide.

The number of Tested pins will increase further as the remaining devices are also categorised in the following section of the tutorial.