eCPRI Intel® FPGA IP User Guide

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ID 683685
Date 11/11/2021
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Document Table of Contents
Document Table of Contents x
1. Introduction 2. Getting Started 3. IP Parameters 4. Functional Description 5. Interface Overview 6. Registers 7. eCPRI Intel FPGA IP User Guide Archives 8. Document Revision History for eCPRI Intel® FPGA IP User Guide
1. Introduction x
1.1. Supported Features 1.2. Device Family Support 1.3. eCPRI Intel® FPGA IP Device Speed Grade Support 1.4. Resource Utilization 1.5. Intel® FPGA IP Core Verification 1.6. Release Information
2. Getting Started x
2.1. Installing and Licensing 2.2. Specifying the IP Core Parameters and Options 2.3. Generated File Structure 2.4. Simulating the IP Core 2.5. Compiling the Full Design and Programming the FPGA
2.2. Specifying the IP Core Parameters and Options x
2.2.1. Reference and System PLL Clock for your IP Design
4. Functional Description x
4.1. Interfaces 4.2. High Level Data Path Flow 4.3. Operation of the eCPRI IP Blocks
4.2. High Level Data Path Flow x
4.2.1. Transmit TX Path 4.2.2. Receive RX Path 4.2.3. Supported Ethernet Variants
4.3. Operation of the eCPRI IP Blocks x
4.3.1. Packet Classifier 4.3.2. Ethernet Header Insertion/Removal 4.3.3. Concatenation/De-concatenation 4.3.4. Header Mapper/De-Mapper 4.3.5. eCPRI IWF Type 0 4.3.6. eCPRI Message 5 Packet Parser 4.3.7. Packet Queue 4.3.8. eCPRI Message Type 4.3.9. Error Handling 4.3.10. RX Throttling
4.3.8. eCPRI Message Type x
4.3.8.1. eCPRI Message Type 0- IQ Data Transfer 4.3.8.2. eCPRI Message Type 1- Bit Sequence Transfer 4.3.8.3. eCPRI Message Type 2- Real Time Control Data 4.3.8.4. eCPRI Message Type 3- Generic Data Transfer 4.3.8.5. eCPRI Message Type 4- Remote Memory Access 4.3.8.6. eCPRI Message Type 5- One-Way Delay Measurement 4.3.8.7. eCPRI Message Type 6- Remote Reset 4.3.8.8. eCPRI Message Type 7- Event Indication 4.3.8.9. eCPRI Message Type 64- 255 Vendor Specific
5. Interface Overview x
5.1. Clock Signals 5.2. Power, Reset, and Firewalls Signals 5.3. TX Time of Day Interface 5.4. RX Time of Day Interface 5.5. Interrupt 5.6. Configuration Avalon-MM Interface 5.7. Ethernet MAC Source Interface 5.8. Ethernet MAC Sink Interface 5.9. External ST Source Interface 5.10. External ST Sink Interface 5.11. eCPRI IP Source Interface 5.12. eCPRI IP Sink Interface 5.13. Miscellaneous Interface Signals 5.14. IWF Type 0 eCPRI Interface 5.15. IWF Type 0 CPRI MAC Interface
5.2. Power, Reset, and Firewalls Signals x
5.2.1. Reset Control and Initialization Flows
5.7. Ethernet MAC Source Interface x
5.7.1. E-tile Hard IP for Ethernet 1588 PTP Signals 5.7.2. 25G Ethernet MAC 1588 PTP Signals 5.7.3. 10G Ethernet MAC 1588 PTP Signals
5.14. IWF Type 0 eCPRI Interface x
5.14.1. IWF Source Interface 5.14.2. IWF Sink Interface
5.15. IWF Type 0 CPRI MAC Interface x
5.15.1. CPRI 32-bit IQ Data TX Interface 5.15.2. CPRI 64-bit IQ Data TX Interface 5.15.3. CPRI 32-bit Ctrl_AxC TX Interface 5.15.4. CPRI 64-bit Ctrl_AxC TX Interface 5.15.5. CPRI 32-bit Vendor Specific TX Interface 5.15.6. CPRI 64-bit Vendor Specific TX Interface 5.15.7. CPRI 32-bit Real-time Vendor Specific TX Interface 5.15.8. CPRI 64-bit Real-time Vendor Specific TX Interface 5.15.9. CPRI Gigabit Media Independent Interface (GMII) 5.15.10. CPRI IP L1 Control and Status Interface
6. Registers x
6.1. eCPRI Version Register 6.2. eCPRI Scratch Register 6.3. eCPRI Common Control Register 6.4. eCPRI Message 5 Control Register 6.5. eCPRI TX Error Message Register 6.6. eCPRI RX Error Message Register 6.7. eCPRI Error Mask Message Register 6.8. eCPRI Error Log Message Register 6.9. eCPRI Error Message 5 Compensation Value 0 Register 6.10. eCPRI Error Message 5 Compensation Value 1 Register 6.11. eCPRI Transport Delay 0 Register 6.12. eCPRI Transport Delay 1 Register 6.13. eCPRI Transport Delay 2 Register 6.14. Ethernet Frame Scratch Register 6.15. Source MAC Address <i> Register, where i= 0, 1 6.16. Destination MAC n Address <i> Register, where n= 0, 1, 2, 3, 4, 5, 6, 7 and i= 0, 1 6.17. VLAN Tag Register <i>, where i= 0, 1, 2, 3, 4, 5, 6, 7 6.18. Ethertype Register 6.19. IPv4 Dw0 Register 6.20. IPv4 Dw1 Register 6.21. IPv4 Dw2 Register 6.22. IPv4 Source Address Register 6.23. IPv4 Destination Address Register 6.24. UDP Dw0 Register 6.25. UDP Port Register 6.26. MAC Packet Type Enable Register 6.27. RX Error Register
1. Introduction
2. Getting Started
3. IP Parameters
4. Functional Description
5. Interface Overview
6. Registers
7. eCPRI Intel FPGA IP User Guide Archives
8. Document Revision History for eCPRI Intel® FPGA IP User Guide

4.2.1. Transmit TX Path

There are two sets of Avalon-ST source and sink interface signals available to the incoming packets on the transmit TX path. Avalon-ST source/sink interface connects to the eCPRI IP and external source/sink interface connects to external user logic. The incoming eCPRI packets passes through Ethernet header insertion block to insert Ethernet header, optionally with different VLAN tags, IPv4, and UDP headers configured during configuration time.

You can send different types of packets through the external source/sink interface signal (For example, C&M and synchronization packets) which arbitrates with eCPRI packets and the IP sends packets with the higher priority to Ethernet MAC for transmission. The incoming external user packets are expected to arrive with Ethernet MAC header inserted on the packets.

The priority of the packets send to Ethernet MAC is listed as below, with highest priority order from top to bottom:
  • PTP synchronization packet
  • eCPRI packet
  • C&M packets and remaining type of packets

The C&M and PTP synchronization packets are send/receive through external source/sink interface signal. The C&M and PTP synchronization packets are generally low bandwidth traffic. When there is collision between external PTP synchronization packets and eCPRI packets, backpressure to the eCPRI IP occurs to stop eCPRI packets from transmitting. The eCPRI IP implements a counter to track the number of eCPRI packets and PTP packets granted and raise the priority of the C&M packet when the counter reaches a programmable threshold to allow the C&M packet transmission to Ethernet MAC and avoid starvation.

Ensure the bandwidth of external source/sink interface signal won't starve the overall bandwidth and cause interruption on eCPRI traffics. The grant ratio between C&M packets versus eCPRI/PTP packets is 10:1. The bandwidth allocated to C&M packets is 2.5G or 1G. The maximum C&M/PTP FIFO depth is 256 or 2048 bytes for eCPRI IP. The C&M/PTP FIFO should not be kept full beyond 2062.5 * (mac_clk_tx) clock period, to allow for enough read margin prior to the arrival of the new packets.

When you set the Ethernet frame size to 9000 bytes, data from Avalon-ST sink interface directly pass through and does not required buffering. You must assert avst_sink_valid continuously between the assertions of avst_sink_sop and avst_sink_eop. The only exception is when avst_sink_ready signal deasserts, and you are required to deassert avst_sink_valid for three cycles of READY_LATENCY.

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