ASRC work abnormally with noise generated

Hi,

Can you please test the ASRC example available in the ADSP-21568 BSP to isolate the issue you are experiencing on the ADSP-21564. Running this example on your ADSP-21564 platform will help verify whether the ASRC hardware and its basic configuration are working as expected.

Please download and install the ADSP-21568 Board support package (BSP) from the link given below.
download.analog.com/.../ADI_EV-2156x_EZ-KIT-Rel3.0.0.exe

Once installed, please find the ASRC example available in the below mentioned installation path.
[Installation directory]:\Analog Devices\EV-2156x_EZ-KIT-Rel3.0.0\EV-2156x_EZ-KIT\Examples\drivers\asrc

Also, could you please check if there are any hardware differences between your ADSP-21565 and ADSP-21564 setups (e.g. power supply, clock sources, PCB layout, or connectors).

Regards,
Nandini C

Hi,

Can you please test the ASRC example available in the ADSP-21568 BSP to isolate the issue you are experiencing on the ADSP-21564. Running this example on your ADSP-21564 platform will help verify whether the ASRC hardware and its basic configuration are working as expected.

Please download and install the ADSP-21568 Board support package (BSP) from the link given below.
download.analog.com/.../ADI_EV-2156x_EZ-KIT-Rel3.0.0.exe

Once installed, please find the ASRC example available in the below mentioned installation path.
[Installation directory]:\Analog Devices\EV-2156x_EZ-KIT-Rel3.0.0\EV-2156x_EZ-KIT\Examples\drivers\asrc

Also, could you please check if there are any hardware differences between your ADSP-21565 and ADSP-21564 setups (e.g. power supply, clock sources, PCB layout, or connectors).

Regards,
Nandini C

Thanks for your reply! We modified the clock edge configuration as that of the demo app of ADSP21568, and the problem was solved. As the clock configuration below, we just changed it from rising edge to falling edge, then the problem was solved.

Thank you!

Hi,

Glad to know that the issue got resolved and thanks for the update.

Please let us know if you need further assistance on this.

Regards,
Nandini C

It seems still not very stable. Sometimes, it started OK; and sometimes it started with noises, and then it changed to be OK after 1~2 minutes. 

Hi,

Thanks for the update.

Since the issue is intermittent and it resolves after a 1~2 minutes, we believe it is related to clock synchronization or initialization timing issue rather than a ASRC hardware problem.

1) Please ensure that the ASRC is initialized only after all input clocks (MCLK, LRCLK, BCLK) are stable. You can insert a delay or check PLL lock status before enabling ASRC.
2) Have you had a chance to run the BSP example we shared earlier? Does it operate consistently without any issue?
3) As the issue is intermittent, could you please share how frequently the noise occurs?

Regards,
Nandini C

Thanks for your answer! It is caused by the misconfiguration of our PCG unit. After changing the edge to be consistent with that of ASRC, the noise disappeared. 

Thanks for your great supports!