Radio over Ethernet Framer v1.0 LogiCORE IP Product Brief

1 IP FactsThe Xilinx Radio over Ethernet Framer (RoE Framer ) core is part of a complete eCPRI and NextGeneration Fronthaul Interface (NGFI) subsystem solution developed on the Zynq UltraScale+ MPSoC, relying on both hardware and software to provide a comprehensive and efficientcomputing platform for the required protocols and features: eCPRI, IEEE (NGFI), IEEE1588, Synchronous Ethernet , and Node and Network OAM. The core enables Radio datatransmission through a packet-based transport network connecting Remote Radio Units (RRUs)to the centralized Baseband Unit (BBU).Additional DocumentationA Product Guide is available for this core.

2 Access to this material can be requested by clicking onthis registration link: Supports standard IEEE Ethernet packets, optionally including VLAN tags, as well asUDP over IPv4 or IPv6, over Ethernet . Automates in hardware the encapsulation and extraction of I/Q Radio samples in and from thetransported packets, formed according to either the eCPRI Specification (eCPRIS pecification ), or the IEEE IEEE Standard for Radio over EthernetEncapsulations and Mappings (IEEE ) specification. Supports different functional decompositions between RRUs and BBUs and can transporteither time domain or frequency domain I/Q samples, the latter together with real-timecontrol packets.

3 Compatible with xRAN Control, User and Synchronization Plane Specification (xRANS pecification ). At present, each complete XRAN message, being transported as an eCPRI payload, is transferred on the user interfaces as-is. Neither the parsing of XRAN sections, northe construction of proper XRAN data messages, is currently supported. Supports up to four 10 Gb/s or two 25 Gb/s Ethernet ports. Allows mapping of each I/Q data and real-time control stream on any of the instantiatedEthernet ports at run time. Each I/Q sample input and output port is implemented as a 64-bit AXI4-Stream interface andthe number of supported antenna-carrier interfaces can be either 1, 2, 4, 8, 16, or packet sizes and internal buffers are fully customizable.

4 Real-time control packets can be associated to each Radio data flow. The size and format ofcontrol packets can be programmed independently from data over Ethernet Framer ( ) December 5, 2018 LogiCORE IP Product BriefPB056 ( ) December 5, 2018 over Ethernet Framer 1 Send Feedback Programmable reception window allows you to store a convenient number of incomingpackets per stream, trading off latency with resilience against packet delay variation andreordering capability. Implementing time alignment using IEEE 1588, the subsystem can also keep the user clocklocked in frequency and align the generation and collection of I/Q samples to the 10 ms Startof Radio Frame pulse.

5 Supports all eCPRI message types, including one-way delay measurement based on PCS/PMAlevel timestamps, relying on API software. The Framer (uplink) auto-recovers after any Ethernet port fault and restarts each antenna-carrier FIFO in case it overflows. Each Ethernet and IP/UDP header field is fully programmable. Fully programmable filtering rules allow the hardware to identify and manage user planepackets. Configurable dimension of the basic payload data unit at the antenna-carrier interface (64 to16384 bytes). Configurable dimension of the maximum size of payload data to be inserted in a singleEthernet packet (64 to 8118 bytes).

6 Each basic PDU can be split into several Ethernet all the data and real-time control packets need to hold the same length. Each supported antenna-carrier flow can be associated to a programmable flow identifier, aswell as to a specific packet type and Ethernet port number. The configuration of the packet sequence number and its initial and increment values are fullyprogrammable. The state and latency of each available antenna-carrier user data buffer can be monitored,measured, and reported using the CPU interface. Two reference designs, an example design and a demonstration subsystem, are over Ethernet Framer ( ) December 5, 2018 over Ethernet Framer 2 Send FeedbackIP FactsLogiCORE IP Facts TableCore SpecificsSupported Device Family1 Zynq UltraScale+ MPSoC, Zynq UltraScale+ RFSoCSupported User InterfacesAXI4-StreamResourcesPerformanc e and Resource Use web page (registration required)Provided with CoreDesign FilesEncrypted RTLE xample DesignVerilogTest BenchVerilogConstraints FileXilinx Design Constraints (XDC)

7 Simulation ModelVerilogSupported S/W Driver2 LinuxTested Design Flows3 Design EntryVivado Design SuiteSimulationFor supported simulators, see the Xilinx Design Tools: Release Notes SynthesisSupportProvided by Xilinx at the Xilinx Support web pageNotes:1. For a complete list of supported devices, see the Vivado IP Linux OS and driver support information is available from the Xilinx Wiki For the supported versions of the tools, see the Xilinx Design Tools: Release Notes Radio over Ethernet Framer allows the development of a complete solution to support allthe features required by an advanced fronthaul interface.

8 In the LTE and 5G Radio mobilearchitectures, fronthaul is the transport network interconnecting the Remote Radio Units (RRUs)to the Baseband Units (BBUs) and relies on different topologies, such as point-to-point, point-to-multipoint, and ring. To match future requirements in efficiency and flexibility, the fronthaulnetwork is packet-based, relying either directly on the Ethernet network protocol or on a RoE Framer subsystem, shown in the following figure, built from the Radio over EthernetFramer and other Xilinx IP, is a computing platform designed to support the management of theuser, control, and synchronization planes, working as an intelligent and adaptable networkinterface submodule within an implementation of an RRU or over Ethernet Framer ( ) December 5, 2018 over Ethernet Framer 3 Send FeedbackFigure 1.

9 RoE Framer Top Level OverviewX21903-111318 Ethernet MAC 10/25G Optical InterfacePacket FilteringUser Plane AXI4-Streams (1 to 32)Control Plane AXI4-Streams (0 to 32)User Plane AXI4-Streams (1 to 32) Radio Frame to Ethernet EncoderEthernet to Radio Frame DecoderControl Plane AXI4-Streams (1 to 32)1588 Timing Synchronization LogicCustomDFEC ustomDFEADCDACMPSoC with RoE Framer SubsystemData CenterEthernetADC/DACZynq UltraScale+Management Plane AXI4-Stream to CPUO ptical Ethernet Pipe to Data CenterTo transfer user plane information using a packet-based fronthaul, different protocols have beenproposed, such as eCPRI (eCPRI Specification (eCPRI Specification )) and (IEEE IEEE Standard for Radio over Ethernet Encapsulations and Mappings(IEEE )).

10 The eCPRI protocol defines how to handle user data and real-time control packets, together withseveral other services used to control and monitor the remote unit. The IEEE standardsupports both native and legacy implementations, in which existing circuit-based links, such asthose relying on the CPRI protocol, are transported over an Ethernet packet network. The RoEFramer IP can be programmed to support either of the two protocols, configuring the dimensionsof the supported packet formats, setting the methods used to identify each user data flow, andchecking that the packet sequence is RoE Framer supplies IP, drivers, and software APIs to implement supported protocols.