CPRI Intel® FPGA IP User Guide

ID 683595
Date 4/04/2022
Public

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3.2.1. Example CPRI Intel® FPGA IP Core Clock Connections in Different Clocking Modes

Figure 11. CPRI Slave IP Core in Hybrid Clocking ModeThe hybrid clocking mode option is not available in IP core variations that target an Intel Stratix 10 E-tile or Intel® Agilex™ E- tile device.


Note: You must calibrate the transceiver TX PLL used with the CPRI IP connections for optimal performance. If the TX PLL input reference clock is not present, stable, and the correct frequency when the FPGA is configured, it may not be correctly calibrated, In this case you must recalibrate it when the reference clock is correct. Refer to the Transceiver PLL Calibration for more information about the TX PLL calibration.
Figure 12. CPRI Master IP Core in Hybrid Clocking Mode
Figure 13.  CPRI Master IP Core in Internal Clocking Mode for Intel® Stratix® 10 L- tile, H-tile, Intel® Arria® 10, and V-series Device Variations
Figure 14.  CPRI Master IP Core in Internal Clocking Mode for Intel® Stratix® 10 E- tile and Intel® Agilex™ E- tile Device Variations
Figure 15.  CPRI Slave IP Core in Internal Clocking Mode for Intel® Stratix® 10 L- tile, H-tile, Intel® Arria® 10, and V-series Device Variations
Figure 16.  CPRI Slave IP Core in Internal Clocking Mode for Intel® Stratix® 10 E- tile and Intel® Agilex™ E- tile Device Variations
Figure 17.  CPRI Slave IP Core in External Clocking Mode for Intel® Stratix® 10 L- tile, H-tile, Intel® Arria® 10, and V-series Device Variations
Note: For some data rate, you can not connect tx_clkout to cpri_coreclk directly. Example: for 10.1376G data rate, the tx_clkout is 253.46MHz, while the cpri_coreclk requires 307.2MHz.
Figure 18.  CPRI Slave IP Core in External Clocking Mode for Intel® Stratix® 10 E-tile and Intel® Agilex™ E- tile Device Variations
Figure 19.  CPRI Master IP Core in External Clocking Mode for Intel® Stratix® 10 L- tile, H-tile, Intel® Arria® 10, and V-series Device Variations
Note: For some data rate, you can not connect tx_clkout to cpri_coreclk directly. Example: for 10.1376G data rate, the tx_clkout is 253.46MHz, while the cpri_coreclk requires 307.2MHz.
Figure 20.  CPRI Master IP Core in External Clocking Mode for Intel® Stratix® 10 E- tile and Intel® Agilex™ E- tile Device Variations
Figure 21.  CPRI Slave IP Core in External Clocking Mode with Single-Trip Delay Calibration Feature for Intel® Arria® 10 Device Variations Intel® provides the IOPLL and DPCU blocks with the CPRI IP. For correct single-trip delay calibration functionality, you must connect these blocks as shown.