Low Latency Ethernet 10G MAC Intel® Arria® 10 FPGA IP Design Example User Guide
                    
                        ID
                        683063
                    
                
                
                    Date
                    1/11/2022
                
                
                    Public
                
            
                
                    
                        1. Quick Start Guide
                    
                    
                
                    
                        2. 10M/100M/1G/10G Ethernet Design Example for Intel® Arria® 10 Devices
                    
                    
                
                    
                        3. 1G/10G Ethernet Design Example for Intel® Arria® 10 Devices
                    
                    
                
                    
                        4. 10GBASE-R Ethernet Design Example for Intel® Arria® 10 Devices
                    
                    
                
                    
                        5. 1G/2.5G Ethernet Design Example for Intel® Arria® 10 Devices
                    
                    
                
                    
                        6. 1G/2.5G/10G Ethernet Design Example for Intel® Arria® 10 Devices
                    
                    
                
                    
                        7. 10M/100M/1G/2.5G/5G/10G (USXGMII) Ethernet Design Example for Intel® Arria® 10 Devices
                    
                    
                
                    
                        8. Interface Signals Description
                    
                    
                
                    
                        9. Configuration Registers Description
                    
                    
                
                    
                    
                        10. Low Latency Ethernet 10G MAC Intel® Arria® 10 FPGA IP Design Example User Guide Archives
                    
                
                    
                    
                        11. Document Revision History for the Low Latency Ethernet 10G MAC Intel® Arria® 10 FPGA IP Design Example User Guide
                    
                
            
        3.3.2. Clocking Scheme
The following diagrams show the clocking scheme for the design example.
   Figure 19. Clocking Scheme for Ethernet Design Example with IEEE 1588v2 Feature 
     
     
  
 
  
     Note: The IOPLL input reference clock is sourcing from input clock through the global clock network. Sourcing reference clock from a cascaded PLL output, global clock or core clock network may introduce additional jitter to the ATX/FPLL/IOPLL output. Refer to this KDB Answer for a workaround you should apply to the IP core in your design. 
    
 
   
   Figure 20. Clocking Scheme for Ethernet Design Example without IEEE 1588v2 Feature 
     
     
  
 
 
     Note: The IOPLL input reference clock is sourcing from input clock through the global clock network. Sourcing reference clock from a cascaded PLL output, global clock or core clock network may introduce additional jitter to the ATX/FPLL/IOPLL output. Refer to this KDB Answer for a workaround you should apply to the IP core in your design.