CPRI Intel® FPGA IP User Guide

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ID 683595
Date 5/19/2023
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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® 7 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
3.14. Gigabit Media Independent Interface (GMII) to External Ethernet Block x
3.14.1. GMII Normal Mode 3.14.2. Ethernet PCS Bypass Mode 3.14.3. Ethernet PCS Run-Time Switching
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® 7 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

2.5.6. Adding and Connecting the Single-Trip Delay Calibration Blocks

If you turn on Enable single-trip delay calibration in the CPRI parameter editor, and Synchronization mode is set to Slave, the CPRI Intel® FPGA IP core requires that you connect the IOPLL (pll_core block) and the Dynamic Phase Control Unit (DPCU) (pll_dpcu block). You must generate a device core PLL to create the IOPLL. Intel® provides the DPCU block with the CPRI IP, but you must connect it, and the IOPLL, in your design. A single IOPLL block and a single DPCU block can connect to multiple CPRI IP cores.

Figure 10. Connecting a Single DPCU Block and Single IOPLL Block to Multiple CPRI Intel® FPGA IP Cores

You must generate a non-transceiver PLL IP core to create the IOPLL block. You can use the IP Catalog to generate the external PLL IP core that configures a core PLL on the device. In the IP Catalog, select an IP core that configures an appropriate PLL on your target device.

For your Intel® Arria® 10 design, you must select Arria 10 FPLL in the IP Catalog.

In the parameter editor for the fPLL IP core, you must set the following parameter values:

  • Set fPLL Mode to Core.
  • Set the PLL output frequency to the expected input frequency for the CPRI IP cpri_coreclk input signal.
  • Turn on Enable access to dynamic phase shift ports.

You must connect the IOPLL and DPCU signals to the CPRI IP core signals according to the following rules. Refer to Example CPRI Intel FPGA IP Core Clock Connections in Different Clocking Modes for an illustration of the clock connections.

Table 15.  Required Connections to and From IOPLL Block in CPRI Design With Single-Trip Delay Calibration
IOPLL Block Signal Connect to
cntsel (input) DPCU pll_cntsel output signal
num_phase_shifts (input) DPCU pll_num_phase_shifts output signal
outclk_0 (output) CPRI Intel® FPGA IP cpri_coreclk input clock signal
phase_done (output) DPCU pll_phase_done input signal
phase_en (input) DPCU pll_phase_en output signal
refclk (input) CPRI Intel® FPGA IP tx_clkout output signal or output from the off-chip clean-up PLL
rst (input) Drive with the inverse of the CPRI Intel® FPGA IP reset_n input signal
scanclk (input) DPCU pll_scanclk output signal
updn (input) DPCU pll_updn output signal
Table 16.  Required Connections to and From DPCU Block in CPRI Design With Single-Trip Delay Calibration
DPCU Block Signal Connect to
clk Drive in the frequency range of 100–150 MHz.
Note: Intel® recommends that you drive this DPCU input clock with the source for the reconfig_clk.
reset_n (input) CPRI IP reset_n input signal
csr_bit_rate (input) If you turned on Enable line bit rate auto-negotiation in the CPRI parameter editor, connect to the CPRI IP nego_bitrate_out[5:0] output signal.

If autorate negotiation is not turned on, hardwire the DPCU csr_bit_rate signal to the encoded value for the CPRI line bit rate:

  • 6'b000001: 0.6144 Gbps
  • 6'b000010: 1.2288 Gbps
  • 6'b000100: 2.4576 Gbps
  • 6'b000101: 3.0720 Gbps
  • 6'b001000: 4.9150 Gbps
  • 6'b001010: 6.1440 Gbps
  • 6'b010110: 8.11008 Gbps
  • 6'b010000: 9.8304 Gbps
  • 6'b010100: 10.1376 Gbps
  • 6b'011000: 12.16512 Gbps
  • 6'b110000 : 24.33024 Gbps
cal_status (output) CPRI IP cal_status input signal
cal_ctrl (input) CPRI IP cal_ctrl output signal
pll_cntsel (output) IOPLL cntsel input signal
pll_num_phase_shifts (output) IOPLL num_phase_shifts input signal
pll_phase_done (input) IOPLL phase_done output signal
pll_phase_en (output) IOPLL phase_en input signal
pll_scanclk (output) IOPLL scanclk input signal
pll_updn (output) IOPLL updn input signal

User logic must provide the connections. Refer to the Figure: CPRI Slave IP Core in External Clocking Mode with Single-Trip Delay Calibration Feature

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