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

3.3. CPRI Intel® FPGA IP Core Reset Requirements

To reset the entire CPRI IP core, you must assert the reset signals to the IP core and to the required external reset controller logic. The external reset controller logic resets only the transceiver. If you instantiate a duplex CPRI IP core, you must instantiate two PHY Reset Controllers to implement this logic, one for the TX data path and one for the RX data path. The two reset signals reset_tx_n and reset_rx_n each cause the reset logic to reset the relevant data path of the IP core. If you connect these two reset signals to the corresponding PHY Reset Controllers, each one also causes the transceiver in that data path to reset.

In the case of a duplex CPRI IP core , you can assert the reset_n signal instead of asserting the two reset signals reset_tx_n and reset_rx_n. However, unless you also connect the reset_n signal to the external reset controllers, the transceivers do not reset in this case.

In addition, some individual interfaces to the IP core have their own reset signals to reset only the associated interface and logic.

Table 22.   CPRI Intel® FPGA IP Core Input Reset SignalsYou can assert all reset signals asynchronously to any clock. However, you must hold each reset signal asserted for one full clock period of its associated clock, to ensure it is captured by the IP. Intel recommends using the transceiver PHY reset controller IP to drive the following signals:
CPRI Reset Signal Polarity Associated Clock Information
xcvr_tx_analogreset Active high — Analog reset to transmitter from external reset controller.
xcvr_tx_digitalreset Active high — Digital reset to transmitter from external reset controller.
xcvr_rx_analogreset Active high —

Analog reset to receiver from external reset controller.

xcvr_rx_digitalreset Active high — Digital reset to receiver from external reset controller.
reset_n Active low reconfig_clk Asynchronous global reset signal. Resets the IP core soft logic. This signal does not reset the CSR registers, the extended delay measurement settings, or the transceivers.

To reset the CSR registers, you must assert the cpu_reset_n signal. To reset the extended delay measurement settings, you must assert the ex_delay_reset_n signal.

To reset the transceiver you must drive the reset input port of the required PHY Reset Controllers.

ehip_rst_n Active low — Asynchronous reset signal that resets the CPRI PHY TX/RX soft logic and the PCS. This signal connects to i_sl_tx_rst_n and i_sl_rx_rst_n of the CPRI PHY.

This reset signal is only present in the Intel® Stratix® 10 E-tile and Intel Agilex® 7 E- tile device variations.

ehip_rst_csr_n Active low — Asynchronous reset signal that resets the TX/RX soft logic and the PCS, subset of the PMA functions and PCS/PMA CSRs. This signal connects to i_sl_csr_rst_n of the CPRI PHY.
reset_tx_n Active low reconfig_clk Asynchronous global reset signal that resets the TX path of the CPRI IP core. Resets the IP core soft logic. To reset the transceiver you must drive the reset input port of the required PHY Reset Controller.
reset_rx_n Active low reconfig_clk Asynchronous global reset signal that resets the RX path of the CPRI IP core. Resets the IP core soft logic. To reset the transceiver you must drive the reset input port of the required PHY Reset Controller.
ex_delay_reset_n Active low ex_delay_clk Resets the extended delay measurement block.
latency_sreset_n Active low latency_sclk Resets the Intel® Stratix® 10 hard FIFO delay measurement soft logic.
reconfig_reset Active high reconfig_clk Asynchronous reset signal. Resets the CPRI Intel® Arria® 10 or Intel® Stratix® 10 or Intel Agilex® 7 transceiver reconfiguration interface and all of the registers to which it provides access.

In IP cores that target a V-series (28-nm) device, this signal is involved in rate switching and auto-rate negotiation.

In Intel® Arria® 10, Intel® Stratix® 10 and Intel Agilex® 7 variations, this signal is not present if you turn off all of Enable start-up sequence state machine, Enable Native PHY Debug Master Endpoint(NPDME), transceiver capability, control and status registers access, and parameters only available in Intel® Arria® 10 variations, Enable line bit rate auto-negotiation, Enable single-trip delay calibration.

In variations that target other devices, this signal is not present if you turn off all of Enable line bit rate auto-negotiation, Enable start-up sequence state machine.

cpu_reset_n Active low cpu_clk Resets the CPRI CPU interface and all of the registers to which it provides access.
mii_txreset_n Active low mii_txclk Resets the MII transmitter interface and FIFO write logic.
mii_rxreset_n Active low mii_rxclk Resets the MII receiver interface and FIFO read logic.
gmii_txreset_n Active low gmii_txclk Resets the GMII transmitter interface and FIFO write logic.
gmii_rxreset_n Active low gmii_rxclk Resets the GMII receiver interface and FIFO read logic.
Figure 24. Required External BlocksAn example showing how you could connect required components to a single CPRI Intel® FPGA IP core that target V-series, Intel® Arria® 10 and Intel® Stratix® 10 L- and H-tile devices.

To reset the CPRI IP core, you must assert the active low reset_tx_n, reset_rx_n, reset_tx_n and reset_rx_n, or reset_n signals, as appropriate.

To reset the transceiver, you must trigger the reset controller logic. If you make the optional connection to drive the reset_rx_n or reset_n port from the same source as the reset signal for the RX side Reset Controller, asserting the active low reset_rx_n or reset_n signal also triggers the reset controller logic. If you make the optional connection to drive the reset_tx_n or reset_n port from the same source as the reset signal for the TX side Reset Controller, asserting the active low reset_tx_n or reset_n signal also triggers the TX reset controller logic.

When you trigger the reset controllers, they should deassert the xcvr_reset_tx_ready and xcvr_reset_rx_ready input ready signals to the IP core. After each reset controller completes resetting the transceiver and IP core data path, it should assert the relevant ready signal.

For information about resetting the Intel® Stratix® 10 E- tile and Intel Agilex® 7 E- tile transceiver, refer to the Resetting Transceiver Channels.

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