CPRI Intel® FPGA IP User Guide

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ID 683595
Date 7/01/2022
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Document Table of Contents
Document Table of Contents x
1. About the CPRI Intel® FPGA IP Core 2. Getting Started with the CPRI Intel® FPGA IP Core 3. Functional Description 4. CPRI Intel® FPGA IP Core Signals 5. CPRI Intel® FPGA IP Core Registers A. Additional Information
1. About the CPRI Intel® FPGA IP Core x
1.1. CPRI Intel® FPGA IP Core Supported Features 1.2. CPRI Intel® FPGA IP Core Device Family and Speed Grade Support 1.3. Intel® FPGA IP Core Verification 1.4. Resource Utilization for CPRI Intel® FPGA IP Core 1.5. Release Information
1.2. CPRI Intel® FPGA IP Core Device Family and Speed Grade Support x
1.2.1. Device Family Support 1.2.2. CPRI Intel® FPGA IP Core Performance: Device and Transceiver Speed Grade Support
2. Getting Started with the CPRI Intel® FPGA IP Core x
2.1. Installation and Licensing 2.2. Generating CPRI Intel® FPGA IP Core 2.3. CPRI Intel® FPGA IP File Structure 2.4. CPRI Intel® FPGA IP Core Parameters 2.5. Integrating Your Intel® FPGA IP Core in Your Design: Required External Blocks 2.6. Simulating Intel FPGA IP Cores 2.7. Understanding the Testbench 2.8. Running the Design Example 2.9. Compiling the Full Design and Programming the FPGA
2.1. Installation and Licensing x
2.1.1. Intel® FPGA IP Evaluation Mode
2.5. Integrating Your Intel® FPGA IP Core in Your Design: Required External Blocks x
2.5.1. Adding the Transceiver TX PLL IP Core 2.5.2. Adding the Reset Controller 2.5.3. Adding the Transceiver Reconfiguration Controller 2.5.4. Adding the Off-Chip Clean-Up PLL 2.5.5. Adding and Connecting the Single-Trip Delay Calibration Blocks 2.5.6. Transceiver PLL Calibration 2.5.7. Reference and System PLL Clock for your IP Design
3. Functional Description x
3.1. Interfaces Overview 3.2. CPRI Intel® FPGA IP Core Clocking Structure 3.3. CPRI Intel® FPGA IP Core Reset Requirements 3.4. Start-Up Sequence Following Reset 3.5. AUX Interface 3.6. Direct IQ Interface 3.7. Ctrl_AxC Interface 3.8. Direct Vendor Specific Access Interface 3.9. Real-Time Vendor Specific Interface 3.10. Direct HDLC Serial Interface 3.11. Direct L1 Control and Status Interface 3.12. L1 Debug Interface 3.13. Media Independent Interface (MII) to External Ethernet Block 3.14. Gigabit Media Independent Interface (GMII) to External Ethernet Block 3.15. CPU Interface to CPRI Intel® FPGA IP Registers 3.16. Auto-Rate Negotiation 3.17. Extended Delay Measurement 3.18. Deterministic Latency and Delay Measurement and Calibration 3.19. CPRI Intel® FPGA IP Transceiver and Transceiver Management Interfaces 3.20. Testing Features
3.2. CPRI Intel® FPGA IP Core Clocking Structure x
3.2.1. Example CPRI Intel® FPGA IP Core Clock Connections in Different Clocking Modes
3.4. Start-Up Sequence Following Reset x
3.4.1. Start-Up Sequence Interface Signals
3.5. AUX Interface x
3.5.1. AUX Interface Signals 3.5.2. AUX Interface Synchronization 3.5.3. Auxiliary Latency Cycles 3.5.4. Direct Interface CPRI Frame Data Format
3.15. CPU Interface to CPRI Intel® FPGA IP Registers x
3.15.1. CPU Interface Signals 3.15.2. Accessing the Hyperframe Control Words
3.15.2. Accessing the Hyperframe Control Words x
3.15.2.1. Specifying the Control Word 3.15.2.2. Specifying the Position in the Control Word 3.15.2.3. Retrieving the Hyperframe Control Words 3.15.2.4. Writing the Hyperframe Control Words
3.17. Extended Delay Measurement x
3.17.1. Extended Delay Measurement for Soft Internal Buffers 3.17.2. Extended Delay Measurement for Intel® Stratix® 10 Hard FIFOs 3.17.3. Extended Delay Measurement Interface
3.18. Deterministic Latency and Delay Measurement and Calibration x
3.18.1. Delay Measurement and Calibration Features 3.18.2. Delay Requirements 3.18.3. Single-Hop Delay Measurement 3.18.4. Multi-Hop Delay Measurement 3.18.5. Delay Calibration Features
3.18.3. Single-Hop Delay Measurement x
3.18.3.1. Rx Path Delay 3.18.3.2. Tx Path Delay 3.18.3.3. Round-Trip Delay
3.18.5. Delay Calibration Features x
3.18.5.1. Single-Trip Delay Calibration 3.18.5.2. Round-Trip Delay Calibration 3.18.5.3. Tx Bitslip Delay
3.18.5.1. Single-Trip Delay Calibration x
3.18.5.1.1. Single-Trip Latency Measurement and Calibration Interface Signals
3.19. CPRI Intel® FPGA IP Transceiver and Transceiver Management Interfaces x
3.19.1. CPRI Link 3.19.2. Main Transceiver Clock and Reset Signals 3.19.3. Arria V, Arria V GZ, Cyclone V, and Stratix V Transceiver Reconfiguration Interface 3.19.4. Intel® Arria® 10, Intel® Stratix® 10, and Intel® Agilex™ Transceiver Reconfiguration Interface 3.19.5. RS-FEC Interface 3.19.6. Interface to the External Reset Controller 3.19.7. Interface to the External PLL 3.19.8. Transceiver Debug Interface
3.20. Testing Features x
3.20.1. CPRI Intel® FPGA IP Core Loopback Modes 3.20.2. CPRI Intel® FPGA IP Core Self-Synchronization Feature
4. CPRI Intel® FPGA IP Core Signals x
4.1. CPRI Intel® FPGA IP Core L2 Interface 4.2. CPRI Intel® FPGA IP Core L1 Direct Access Interfaces 4.3. CPRI Intel® FPGA IP Core Management Interfaces 4.4. CPRI Intel® FPGA IP Core Transceiver and Transceiver Management Signals
A. Additional Information x
A.1. CPRI Intel® FPGA IP User Guide Archives A.2. Document Revision History for the CPRI Intel® FPGA IP User Guide
1. About the CPRI Intel® FPGA IP Core
2. Getting Started with the CPRI Intel® FPGA IP Core
3. Functional Description
4. CPRI Intel® FPGA IP Core Signals
5. CPRI Intel® FPGA IP Core Registers
A. Additional Information

2.7. Understanding the Testbench

Intel® provides a demonstration testbench with the CPRI Intel® FPGA IP.

If you click Generate Example Design in the CPRI parameter editor, the Quartus® Prime software generates the demonstration testbench. The parameter editor prompts you for the desired location of the testbench.

The testbench performs the following sequence of actions with the static DUT

  1. Start up CPRI rate.
  2. Enables transmission on the CPRI link by setting the tx_enable bit (bit [0]) of the CPRI IP core L1_CONFIG register at offset 0x8 (and resetting all other fields of the register)>
  3. Configures the DUT at the highest possible HDLC bit rate for the CPRI line bit rate, by setting the tx_slow_cm_rate field of the CPRI CM_CONFIG register at offset 0x1C to the appropriate value.
  4. Reads the CM_CONFIG register to confirm settings.
  5. BFN number resynchronization if the resynchronization of CPRI radio frame number to a desired value is enabled.
  6. After the DUT and the testbench achieve frame synchronization, executes the following transactions (Only when you turn on corresponding interface in IP parameter editor):
    1. Startup Sequence Finite-State Machine (FSM) with Protocol Version and C&M Auto-Negotiation.
    2. Performs several write transactions to the IQ interface and confirms the testbench receives them on the CPRI link.
    3. Performs several write transactions to the AUX interface and confirms the testbench receives them on the CPRI link.
    4. Performs several write transactions to the Ctrl_AxC interface and confirms the testbench receives them from the DUT on the CPRI link.
    5. Performs several write transactions to the VS interface and confirms the testbench receives them from the DUT on the CPRI link.
    6. Performs several write transactions to the RTVS interface for the 10G variant, and confirms the testbench receives them form the DUT on the CPRI link.
    7. Performs several HDLC transactions and confirms the testbench receives them from the DUT on the CPRI link.
    8. Performs several write transactions to the MI or GMI interface and confirms the testbench receives them from the DUT on the CPRI link.
    9. Rate negotiation to new CPRI rate (Switches to the next lower bit rate if available, otherwise test ends at the lowest bit rate).
    10. Repeat steps b to i.
Table 17.  Interface Signals
Signal Name Direction Type Description
clk_100 Input 1-Bit Logic 100MHz used for clocking test components, CSR and reset controls.
sampling_refclk Input 1-Bit Logic Reference clock for Intel® Agilex™ F-Tile IOPLL (Only for Intel® Agilex™ F-Tile devices).
cdr_refclk Input 1-Bit Logic Reference clock for Core IOPLL, Extended Delay Measurement PLL, and Transceiver.
cdr_refclk1 Input 1-Bit Logic Secondary reference clock for Core IOPLL, Extended Delay Measurement PLL, and Transceiver when rate negotiation is enabled (Only for Intel® Stratix® 10 H-Tile or Intel® Arria® 10 Devices).
ehip_ref_clk Input 1-Bit Logic Reference clock used to generate high speed serial clocks and data path parallel clocks in CPRI IP (Only for F-Tile and E-Tile devices).
ehip_ref_clk1 Input 1-Bit Logic Secondary reference clock used to generate high speed serial clocks and data path parallel clocks in CPRI IP when rate negotiation is enabled (Only for F-Tile / E-Tile devices).
aib_pll_refclk Input 1-Bit Logic Reference clock for Intel® Agilex™ F-tile and E-Tile or Intel® Stratix® 10 E-Tile AIB PLL (Only for F-Tile and E-Tile devices).
reset_n Input 1-Bit Logic Global active-low reset.
rx_serial Input 1-Bit Logic Receiver serial port.
tx_serial Output 1-Bit Logic Transmitter serial port.
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