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AD9957 Recommended for New Designs
The AD9957 functions as a universal I/Q modulator and agile upconverter for communications systems where cost, size, power consumption, and dynamic performance...
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How to write successfully user data to RAM in AD9957

		
	
				

			

									
					    bsalski
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Dec 5, 2016 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
Hi,

 
It seems that this issue has already been raised at this forum. Unfortunately, even though I tried to follow exactly the suggested steps I couldn't get the data successfully delivered to the memory in AD9957. In particular, I'm not sure how to organize the sequence of signals during RAM loading. I tried as follows:

 
1. CS = low

 
2. Send RAM address (0x16)

 
3. Send N 32-bit words one after another (with I/O_Update issued after each of them)

 
4. CS = high

 
Sometimes, I see that the first bit is changed but all the other are unaffected by the above procedure.

 
I will appreciate any suggestions.

 
Bartek

			

			
									
		                             
                        

    

                                            
                 Quadrature Digital Up Converters (QDUC)
                
                                                    
                 High Speed D/A Converters =30MSPS
                
                                                    
                 ad9957
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			








	
	
	
	



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                on Dec 6, 2016 11:31 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Thanks for the prompt reaction on my inquiry. However, I tried to follow your suggestions without success. Let me just mention that:
    
 
    1. single tone works ok
    
 
    2. in the interpolating DAC mode, any changes of RAM size affects periodicity of the generated signal but the content is incorrect (noisy)
    
 
    Let me share with all my sequence hoping you will find some mistakes:
    
 
    /CS = 1
    SCLK = 1
    MASTER_RESET = 1
    MASTER_RESET = 0
    
 
    //CFR1 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x00
    0x01000002
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    //CFR2 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x01
    0x00400020
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    //CFR3 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x02
    0x113f0100
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    //PROFILE0 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x0e
    0x0480000000000000
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    //RAM Segment Register 0 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x05
    0x000100030004
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    RT = 0
    RT = 1
    
 
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x16
    0x00
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    0x00
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    0x00
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    0x00
    /CS = 1
    
 
    RT = 0
    RT = 1
    
 
    //CFR1 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x00
    0x9f000002
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    RT = 0
    RT = 1
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Dec 6, 2016 11:31 AM
            
            
						
			            		
    
		
										0
					
	
    

		
		
    
		
    
                                
                                                            
    
					
    Thanks for the prompt reaction on my inquiry. However, I tried to follow your suggestions without success. Let me just mention that:
    
 
    1. single tone works ok
    
 
    2. in the interpolating DAC mode, any changes of RAM size affects periodicity of the generated signal but the content is incorrect (noisy)
    
 
    Let me share with all my sequence hoping you will find some mistakes:
    
 
    /CS = 1
    SCLK = 1
    MASTER_RESET = 1
    MASTER_RESET = 0
    
 
    //CFR1 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x00
    0x01000002
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    //CFR2 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x01
    0x00400020
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    //CFR3 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x02
    0x113f0100
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    //PROFILE0 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x0e
    0x0480000000000000
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    //RAM Segment Register 0 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x05
    0x000100030004
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    RT = 0
    RT = 1
    
 
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x16
    0x00
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    0x00
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    0x00
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    0x00
    /CS = 1
    
 
    RT = 0
    RT = 1
    
 
    //CFR1 settings:
    I/O_RESET = 1
    I/O_RESET = 0
    /CS = 0
    0x00
    0x9f000002
    /CS = 1
    I/O_UPDATE = 0
    I/O_UPDATE = 1
    I/O_UPDATE = 0
    
 
    RT = 0
    RT = 1
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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