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AD9371 Recommended for New Designs
The AD9371 is a highly integrated, wideband RF transceiver offering dual channel transmitters and receivers, integrated synthesizers, and digital signal...
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Issue with the SPI for ADRV9371 Board on a VCU108

		
	
				

			

									
					    L.Christin
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jan 29, 2026 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user is experiencing issues with SPI communication on the AD9371 evaluation board when using a VCU108 FPGA. The SPI signals are present but the response voltage level is too low. The solution involves ensuring the VADJ voltage is set correctly to 2.5V, as it affects the SPI interface voltage levels. The user also confirmed that the issue is resolved on a ZC706 board, suggesting a configuration difference between the two platforms.
                        	    

                
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Hello,

 
We are working with the ADRV9371, but we get an issue when we try to communicate by the SPI. We use the Xilinx SPI IP on a VCU108, with a Micro blaze MCU to implement the Mykonos code.

 
We put both Resetb and FMC_clk_resetb to one, and we have something coming out from the FPGA SPI, we checked it with a probe and everything is going through the FMC connector as it should be.

 
But at the moment we can’t get any response coming back from the Analog device board, but it’s working with the TES software on a ZC706. We compared the frame shape and they match (clock polarity and phases are good).

 
 

 
    
  
  1. Did we forgot something that is essential for the AD9371 evaluation board?
    2. 
  
  2. Also what is the purpose of the HAL_initSpi() in CMB_setSPIOptions() because we don´t have any information about this, what do we need to do to replace it? It is used to change the register of the AD9371 SPI or only for the FPGA?
    3. 
  
  3. In the constraint file we can´t use the IOSTANDARD LVCMOS25 we can only use LVCMOS18, can we have issue due to that with the High level?
    4. 
 

 
Best regards.

			

			
									
		                                 
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                 ad9371
                
                                                    
                 Wideband Transceiver IC
                
                                                    
                 RF Integrated Transceivers
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Dec 14, 2023 8:15 AM
            
            
												
						in reply to DaveTacoma
					
										
			            		
    
		
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    There is no bug with the eval board reset. The eval board was released few years back and this is the first time we hear an issue with reset.
    

    Reset not proper should not damage the SPI interface.
    

    Reset is pulled up with 10K to 1.8V VDD_IF voltage and this voltage will come up after all the supplies are brought up .
    

    In any case , because of the reset pin SPI interface doesn't go bad and no customers have reported this issue earlier . 
    

    Was this board working before and what change caused this failure ?
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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