Ti95 XLR Cell

The eXchangeable Logic and Routing (XLR) cell is the basic building block of the Quantum® architecture. The Efinix® XLR cell combines logic and routing and supports both functions. This unique innovation greatly enhances the transistor flexibility and utilization rate, thereby reducing transistor counts and silicon area significantly.

Notice: For more detailed on the advantages the XLR cell brings to Titanium™ FPGAs, read the Why the XLR Cell is a Big Deal White Paper.
The XLR cell functions as:
  • A 4-input LUT that supports any combinational logic function with four inputs.
  • A simple full adder.
  • An 8-bit shift register that can be cascaded.
  • A fracturable LUT or full adder.
The logic cell includes an optional flipflop. You can configure multiple logic cells to implement arithmetic functions such as adders, subtractors, and counters.

Ti95 XLR cells have enhanced functionality to improve the quality of results during compilation. For all XLR cell functions you can drive the flipflop without going through the LUT first, which helps to reduce the amount of logic required. This feature helps designs that are logic limited. Additionally, the XLR has an improved routing structure that increases the routability of hard-to-route designs.

Figure 1. Logic Cell Functions
Notice: Refer to the Quantum® Titanium Primitives User Guide for details on the Titanium™ logic cell primitives.