Intel® Cyclone® 10 GX Transceiver PHY User Guide

ID 683054
Date 4/14/2023
Document Table of Contents

2.8.2. Supported Features for CPRI

The CPRI protocol places stringent requirements on the amount of latency variation that is permissible through a link that implements these protocols.

CPRI (Auto) and CPRI (Manual) transceiver configuration rules are both available for CPRI designs. Both modes use the same functional blocks, but the configuration mode of the word aligner is different between the Auto and Manual modes. In CPRI (Auto) mode, the word aligner works in deterministic mode. In CPRI (Manual) mode, the word aligner works in manual mode.

To avoid transmission interference in time division multiplexed systems, every radio in a cell network requires accurate delay estimates with minimal delay uncertainty. Lower delay uncertainty is always desired for increased spectrum efficiency and bandwidth. The Cyclone® 10 GX devices are designed with features to minimize the delay uncertainty for both RECs and REs.