Working Vs Not working waveform AD1937

Question

Hi Team, 
 While using AD1937 with intel processor CSVI engine audio is working fine below is the captured wave form.

But when changed to intel PSE engine for DMA there is no sound or signal coming out of Codec. Have attached I2S signal images below for PSE output.

Is there any recommended timing sequence to be followed for I2S in AD1937. Kindly let us know any possible solutions to implement audio in PSE.

DaveThib · Answer

Hello Ganesh, 
 Is the source of the I2S signals coming from a part that is also using the same MCLK that you are sending to the codec? 
 PLL+CLK_CTRL0 I am not sure what you are doing there? Are you setting it to 0x98? 
 Then I see 0x81 and 0x98? So are you initially setting it to 0x81 then writing 0x98? 
 With 0x81 you are powering down the PLL. 
 
 In the DAC Control register 1, you are setting it to read the data bits at the end of the cycle. This should not be a big problem so I do not expect this to be the reason. 
 
 I see you are muting the unused channels which is fine... 
 So I do not see some glaring issue showing a problem of how you are setting up the part. 
 
 So I am thinking this is more of a hardware issue with what you have disclosed to me so far. 
 You can try to turn on the MCLK output pin and see if you see the correct clock frequency out of that pin. This would validate that the PLL is working and you have an internal clock . 
 Look at the CM pin. Is that at a correct voltage? 
 Look at the FILTR pin voltage. 
 Obviously, checking all the power pins would be a good thing to do. 
 I had asked if you read back the registers to verify they were properly written. Have you done that? 
 By the way, often overlooked when checking power pins is checking the ground pins!!! I have seen bad solder joints on a ground pin cause serious issues. 
 
 Are you using the ADCs? Are those working? 
 
 Then one last thing, have you talked to it and asked it nicely to work? 
 Enough for now, 
 Dave T

SLA Status	Assignee	Support Status
SLA Closed. Met after 23 hours	DaveThib	Awaiting Customer Response

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Working Vs Not working waveform AD1937

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