Low-loss compression of CPRI baseband data
This paper describes a method of using Mu-Law compression for Gaussian-like waveforms – for example, baseband IQ data, as used in CPRI interfaces.
Vendor:
Lattice Semiconductor Corp.
Category:
CPRI
Common Public Radio Interface - IP Core
This document provides technical information about the Lattice Common Public Radio Interface (CPRI) IP core.
Overview
This document provides technical information about the Lattice Common Public Radio Interface (CPRI) IP core. This IP core together with SERDES and Physical Coding Sublayer (PCS) functionality integrated in the LatticeECP3™ and ECP5™ LFE5UM FPGAs implements the physical layer of the CPRI specification and interleaves IQ data with synchronization, control and management information. It can be used to connect Radio Equipment Control (REC) and Radio Equipment (RE) modules.
The CPRI IP core implements not only all of the capabilities required to support the physical layer of the CPRI specification (basic function), but also specific requirements related to link delay accuracy (low latency character).
One CPRI core configuration for 5G version (4.9152 Gbps) is also supported. It is similar to the "low latency" one for 3G version except the data rate.
The CPRI IP core implements not only all of the capabilities required to support the physical layer of the CPRI specification (basic function), but also specific requirements related to link delay accuracy (low latency character).
One CPRI core configuration for 5G version (4.9152 Gbps) is also supported. It is similar to the "low latency" one for 3G version except the data rate.
Key features
- Supports the physical link layer (Layer 1) of the CPRI specification
- Supports three standard bit rates of the CPRI specification
- 614.4 Mbps
- 1228.8 Mbps
- 2457.6 Mbps
- 3072 Mbps
- Supports 8b/10b encoding/decoding performed in the PCS/SERDES
- Supports code-violation detection performed in the PCS/SERDES
- Performs CPRI Hyperframe Framing
- Performs interleaving of IQ data, sync, C&M data, and vendor specific information
- Provides an 8-, 16-, or 32-bit parallel interface for IQ data
- Performs subchannel mapping:
- Supports a slow C&M channel based on a serial HDLC interface at standard bit rates (240 Kbps, 480 Kbps,960 Kbps, and 1920 Kbps). The HDLC framer, if needed, must be provided as a separate IP core.
- Supports a fast C&M channel based on a serial Ethernet interface (84.48 Mbps max.) to the user logic, anon-standard rate MII Ethernet interface to a MAC, or a 100 Mbps MII interface to a PHY device. Accepts a user-selected pointer to the CPRI subchannel where the Ethernet link starts. The Ethernet MAC function isprovided as a separate IP core.
Block Diagram
CPRI block diagram
Specifications
Identity
Part Number
CPRI
Vendor
Lattice Semiconductor Corp.
Type
Silicon IP
Files
Note: some files may require an NDA depending on provider policy.
Provider
HQ:
USA
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Frequently asked questions about CPRI IP cores
What is Common Public Radio Interface - IP Core?
Common Public Radio Interface - IP Core is a CPRI IP core from Lattice Semiconductor Corp. listed on Semi IP Hub.
How should engineers evaluate this CPRI?
Engineers should review the overview, key features, supported foundries and nodes, maturity, deliverables, and provider information before shortlisting this CPRI IP.
Can this semiconductor IP be compared with similar products?
Yes. Buyers can compare this product with similar semiconductor IP cores or IP families based on category, provider, process options, and structured technical specifications.