L- and H-Tile Transceiver PHY User Guide

ID 683621
Date 7/20/2022
Public
Document Table of Contents

2.5.4.3. 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 in the Native PHY IP core. 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 Intel® Stratix® 10 transceivers are designed with features to minimize the delay uncertainty for both RECs and REs.

Refer to the Word Aligner in Deterministic Latency Mode section for more information.

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