Developer Guide

Contents

Register

A register is the most basic storage element in an FPGA. It has an input (
in
), an output (
out
), and a clock signal (
clk
). It is synchronous, that is, it synchronizes output changes to a clock. In an ALM, a register may store the output of the LUT.
The following figure illustrates a register:
Register
Register
The clock signal is implied and not shown in some figures.
The following figure illustrates the waveform of register signals:
Waveform of Register Signals
Register Waveform
The input data propagates to the output on every clock cycle. The output remains unchanged between clock cycles.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.