Truth Table Inputs Selection

Input Overview

The inputs can be individually:

Internal Feedback Inputs (FEEDBACK)

When selected (INSELy = FEEDBACK in CCL.LUTnCTRLx), the Sequencer (SEQ) output is used as input for the corresponding LUT.

The output from an internal sequencer can be used as an input source for the LUT. See the figure below for an example for LUT0 and LUT1. The sequential selection for each LUT follows the formula:


With N representing the sequencer number, and i = 0, 1, 2 representing the LUT input index.

For more details, refer to Sequencer Logic.

Figure 1. Feedback Input Selection

Linked LUT (LINK)

When selecting the LINK input option, the next LUT’s direct output is used as the LUT input. In general, LUT[n+1] is linked to the input of LUT[n]. LUT0 is linked to the input of the last LUT.

Figure 2. Linked LUT Input Selection

Internal Events Inputs Selection (EVENT)

Asynchronous events from the Event System can be used as input to the LUT. Two event input lines (EVENT0 and EVENT1) are available and can be selected as LUT input. Configure the Event System before selecting the EVENT input option.

I/O Pin Inputs (I/O)

When selecting the I/O option, the LUT input will be connected to its corresponding I/O pin. Refer to the I/O Multiplexing section for more details about where the LUTnINy is located.

Figure 3. I/O Pin Input Selection


The different peripherals on the three input lines of each LUT are selected by writing to the respective LUT n Input y bit fields in the LUT n Control B and C registers: