Xilinx Virtex-6 Manual page 105

CFGLUT5
Primitive: 5-input Dynamically Reconfigurable Look-Up Table (LUT)
Introduction
This element is a runtime, dynamically reconfigurable, 5-input look-up table (LUT) that enables the changing
of the logical function of the LUT during circuit operation. Using the CDI pin, a new INIT value can be
synchronously shifted in serially to change the logical function. The O6 output pin produces the logical output
function, based on the current INIT value loaded into the LUT and the currently selected I0-I4 input pins.
Optionally, you can use the O5 output in combination with the O6 output to create two individual 4-input
functions sharing the same inputs or a 5-input function and a 4-input function that uses a subset of the 5-input
logic (see tables below). This component occupies one of the four LUT6 components within a Slice-M.
To cascade this element, connect the CDO pin from each element to the CDI input of the next element. This will
allow a single serial chain of data (32-bits per LUT) to reconfigure multiple LUTs.
Port Descriptions
Port Direction
O6 Output
O5 Output
I0, I1, I2, I3, I4 Input
CDO Output
CDI Input
CLK Input
CE Input
Virtex-6 Libraries Guide for HDL Designs
UG623 (v 14.5) March 20, 2013
Width Function
1 5-LUT output
1 4-LUT output
1 LUT inputs
1
Reconfiguration data cascaded output (optionally connect to the CDI input
of a subsequent LUT)
1 Reconfiguration data serial input
1 Reconfiguration clock
1 Active high reconfiguration clock enable
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Chapter 4: About Design Elements
105