Chapter 3

Understanding Attributes

This chapter covers data values syntax and the most common LogiBLOX attributes. Data values are a combination of radices and numeric values that you assign to some LogiBLOX attributes. Attributes are used to customize LogiBLOX modules.

This chapter contains the following sections.

• “Data Values” explains the use of numeric values for some module attributes.
  
  
• “Implementation Styles” explains the different ways that some LogiBLOX modules can be implemented, depending on the device family.
  
  
• “Inverting and Decoding Masks for Gated Modules” explains the use of inversion masks and decode masks on Simple Gates modules.
  
  
• “Synchronous and Asynchronous Control” explains the use of synchronous and asynchronous pins and attributes in many of the LogiBLOX modules.
  
  
• “Location Attributes” explains the use of the Location attribute to place I/O modules in a specific IOB location.
  
  
• “OE Phase” explains the use of the OE Phase attribute to control the function of the Output Enable pin.
  
  
• “Constraining LogiBLOX Modules” explains how to constrain LogiBLOX modules by using the Floorplanner, or by attaching RLOC_ORIGIN and RLOC_RANGE constraints to them.