eCPRI Intel® FPGA IP User Guide

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ID 683685
Date 2/22/2024
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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. IP 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® Memory-Mapped 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
1. Introduction
2. Getting Started
3. IP Parameters
4. Functional Description
5. Interface Overview
6. IP Registers
7. eCPRI Intel FPGA IP User Guide Archives
8. Document Revision History for eCPRI Intel® FPGA IP User Guide

4.3.9. Error Handling

Table 28.  Error Condition Behavior
Events Hardware Logging Mitigations
Invalid measurement ID received on eCPRI message type 5. Log last error measurement ID and action type in eCPRI RX error message register. None
Timeout no response for eCPRI message type 5. Log pending measurement ID and action type in eCPRI RX error message register. None
Timeout no end of concatenation message received. eCPRI TX error message register. Convert last message to C=0 and send out the messages.
Invalid eCPRI message types. The invalid message types are 8 to 63.

When you enable Pair with ORAN parameter, the IP only supports message type 0, 2 and 5. All other message types are invalid.

Log last error message type in eCPRI TX error message register eCPRI message drop.
Invalid message type 5 action types. eCPRI RX error message register None
Multiple message concatenation size is greater than MTU. eCPRI TX error message register. Split the messages into 2 or more PDU and send out the messages.
Single message concatenation size is greater than MTU. eCPRI RX error message register. eCPRI message drop.
Timeout no reset access response. eCPRI RX error message register. None
Timeout no memory access response Log last memory access ID and op code in eCPRI RX error message register. None
Missing SOP eCPRI TX/RX error message register. Incoming data drop.
Missing EOP eCPRI TX/RX error message register. Incoming data drop.

When the Ethernet frame size set to 9000 bytes, there is no message drop but the eCPRI IP sets Avalon® streaming interface source error.

Buffer overflow eCPRI TX/RX error message register. None
M20K ECC eCPRI TX/RX error message register. None
RX eCPRI payload length not match payload size. eCPRI RX error message register eCPRI error asserted only on the last packet of the concatenated packet and Avalon® streaming interface error asserted at EOP. That means earlier packet(s) have integrity issues.
RX eCPRI invalid concatenation bit. eCPRI Rx Error Message Register eCPRI error asserted only on the last packet of the concatenated packet and Avalon® streaming interface error asserted at EOP. That means earlier packet(s) have integrity issues.
TX Avalon® streaming interface does not follow the requirement.

The eCPRI IP performs this check only in streaming mode.

User Avalon® streaming interface error register eCPRI IP asserts mac_source_error at EOP.
TX Avalon® streaming interface packet size does not match with the user supply packet size

The eCPRI IP performs this check only in streaming mode.

Invalid eCPRI sink packet size register eCPRI IP asserts mac_source_error at EOP.
Receiving an error packet from the MAC for message type 5 RX message 5 error register Incoming packets drop.
The eCPRI IP behaves as follows upon observing timeout error due to multiple no memory access responses in receiver:
  • When first request timeout due to no response, first timeout counter stops counting and error interrupt triggered.
  • Second request timeout due to no response happen, second timeout counter stops counting as well. Now there are two errors pending in IP.
  • Software service the interrupt routine and determine the error is due to timeout no response. The software clears the error.
  • Interrupt is deasserted and then asserted again due to second error and software handling of error is repeated.

It is software responsibility to handle the timeout error to avoid software hang due to pending memory access response.

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