Modifying Device Designs › Device User Source › Understanding Device User Source

Understanding Device User Source

The term device user source refers to both:

• An EXCUSRSRC function that contains device language statements that can be applied to a device function to customize the associated device design
• The user-defined device language statements contained in the EXCUSRSRC function

User source attached to a device function is automatically reapplied each time the device function is regenerated.

Since DDS is the most commonly used device language, you can also use the more specific term DDS user source to refer to the EXCUSRSRC function and the user-defined DDS.

User-defined device code must use the same device language used by the device function to which it is applied. In addition, it is your responsibility to ensure that it follows the syntax rules of the device language.

The device EXCUSRSRC function may also contain special instructions called merger commands that specify how device user source is added to or substituted for automatically generated source for the device design.

The user-defined device source is stored as a separate member of the source file associated with the device language; for example, QDDSSRC in the generation library.