CPRI Intel® FPGA IP User Guide

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ID 683595
Date 10/07/2022
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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 6. CPRI Intel® FPGA IP User Guide Archives 7. Document Revision History for the CPRI Intel® FPGA IP User Guide
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. System PLL Connections for the Intel® Agilex™ F-tile Variations 2.5.3. Adding the Reset Controller 2.5.4. Adding the Transceiver Reconfiguration Controller 2.5.5. Adding the Off-Chip Clean-Up PLL 2.5.6. Adding and Connecting the Single-Trip Delay Calibration Blocks 2.5.7. Transceiver PLL Calibration 2.5.8. 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 Control Word Writing Example when Data path width is set to 32: Control Word Writing Example when Data path width is set to 64: Control Word Transmission Example
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
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
6. CPRI Intel® FPGA IP User Guide Archives
7. Document Revision History for the CPRI Intel® FPGA IP User Guide

3.15.2.4. Writing the Hyperframe Control Words

A control transmit table contains one entry for each of the 256 control words in the current hyperframe. Each control transmit table entry contains a control word and an enable bit. As the frame is created, if a control word entry is enabled, and the global tx_ctrl_insert_en bit in the L1_CONFIG register is set, the IP core writes the appropriate control transmit table entry to the CPRI frame's control word.

Control Word Writing Example when Data path width is set to 32:

You write to a control transmit table entry through the TX_CTRL register. This register access method requires that you write the control word in 32-bit sections. Use the tx_ctrl_seq field of the CTRL_INDEX register to specify the 32-bit section you are currently writing to the TX_CTRL register.

To write a control word in the control transmit table, perform the following steps after frame synchronization (state_l1_synch is 3’h6) is achieved. When you write to a specific field of a register, do not clear other bits.

  1. Write the control word number X to the tx_ctrl_x field of the CTRL_INDEX register.
  2. Reset the tx_ctrl_seq field of the CTRL_INDEX register to the value of zero.
  3. Write the first 32-bit section of the next intended #Z.X control word to the TX_CTRL register.
  4. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  5. If the CPRI line bit rate is greater than 2.4576 Gbps, increment the tx_ctrl_seq field of the CTRL_INDEX register to the value of 1 and write the second 32-bit section of the next intended #Z.X control word to the TX_CTRL register.
  6. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  7. If the CPRI line bit rate is greater than 4.9152 Gbps, increment the tx_ctrl_seq field of the CTRL_INDEX register to the value of 2 and write the third 32-bit section of the next intended #Z.X control word to the TX_CTRL register.
  8. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  9. If the CPRI line bit rate is greater than 6.144 Gbps, increment the tx_ctrl_seq field of the CTRL_INDEX register to the value of 3 and write the fourth 32-bit section of the next intended #Z.X control word to the TX_CTRL register.
  10. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  11. If the CPRI line bit rate is 10.1376 Gbps, increment the tx_ctrl_seq field of the CTRL_INDEX register to the value of 4 and write the fifth 32-bit section of the next intended #Z.X control word (the real-time vendor specific bytes) to the TX_CTRL register.
  12. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  13. After you update the control transmit table, set the tx_ctrl_insert_en bit of the L1_CONFIG register to enable the CPRI IP core to write the values from the control transmit table to the control words in the outgoing CPRI frame.

Control Word Writing Example when Data path width is set to 64:

To write a control word in the control transmit table, perform the following steps after frame synchronization (state_l1_synch is 3’h6) is achieved. When you write to a specific field of a register, do not clear other bits.

  1. Write the control word number X to the tx_ctrl_x field of the CTRL_INDEX register.
  2. Reset the tx_ctrl_seq field of the CTRL_INDEX register to the value of zero.
  3. Write the first 32-bit section of the next intended #Z.X control word to the TX_CTRL register.
  4. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  5. If the CPRI line bit rate is greater than 2.4576 Gbps, increment the tx_ctrl_wpos field of the CTRL_INDEX register to the value of 1 and read the second 32-bit section of the next intended #Z.X control word to the TX_CTRL register.
  6. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  7. If the CPRI line bit rate is greater than 4.9152 Gbps, increment the tx_ctrl_seq and clear the rx_ctrl_wpos fields of the CTRL_INDEX register to the value of 1 and 0 respectively and read the 32-bit section of the next intended #Z.X control word to the TX_CTRL register.
  8. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  9. If the CPRI line bit rate is greater than 6.144 Gbps, increment the tx_ctrl_wpos field of the CTRL_INDEX register to the value of 1 and read the fourth 32-bit section of the next intended #Z.X control word to the RX_CTRL register.
  10. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  11. If the CPRI line bit rate is greater than 9.8304 Gbps, increment the tx_ctrl_seq and clear the tx_ctrl_wpos field of the CTRL_INDEX register to the value of 2 and 0 respectively and write the fifth 32-bit section of the next intended #Z.X control word to the TX_CTRL register.
  12. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  13. If the CPRI line bit rate is 10.1376 Gbps, increment the tx_ctrl_wpos field of the CTRL_INDEX register to the value of 1 and write the sixth 32-bit section of the next intended #Z.X control word (the real-time vendor specific bytes) to the TX_CTRL register.
  14. Set the tx_ctrl_insert bit of the CTRL_INDEX register to the value of 1.
  15. If the CPRI line bit rate is 24.33024 Gbps, increment the tx_ctrl_seq/tx_ctrl_wpos in a similar pattern to transmit subsequent 32-bit section to the TX_CTRL register.

The tx_control_insert bit of the CTRL_INDEX register enables or disables the transmission of the corresponding control transmit table entry in the CPRI frame. The tx_ctrl_insert_en bit of the L1_CONFIG register is the master enable: when it is set, the CPRI IP core writes all table entries with the tx_ctrl_insert bit set into the CPRI frame.

Control Word Transmission Example

To write the vendor-specific portion of the control word in a transmitted hyperframe, perform the following steps:

  1. Identify the indices for the vendor-specific portion of the transmit control table, using the formula X = Ns + 64 * Xs.

    In the example, Ns = 16 and Xs = 0, 1, 2, and 3. Therefore, the indices to be read are 16, 80, 144, and 208.

  2. For each value X in 16, 80, 144, and 208, perform the sequence of steps listed above.

    After you update the control transmit table with the control bytes, to insert the data in the next outgoing CPRI frame, make sure that you set thetx_ctrl_insert_en bit of the L1_CONFIG register to the value of 1 as specified in the instructions.

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