PCM9211 DIT configuration

Peter Haynes

Other Parts Discussed in Thread: PCM9211EVM-U, PCM9211

Using the PCM9211EVM-U Evaluation Board I am unable to route valid a Valid SPDIF output from the DIT to MP0.

Firstly I set up the PCM9211 to accept an SPDIF 44.1kHz input on RXIN3 and rout this through to Main Out and MPO0 as shown below: The correct output was decoded on both the Main (I2S) and MPO0 (SPDIF) outputs

I then tried to get an SPDIF output from a range of inputs connected to the DIT. Below is the same setup as above, SPDIF 44.1kHz input RXIN3 to Main out and then routed through the DIT to MPO0. The register settings for the DIT were as below:

An Audio Precision APx52x was unable to get SPDIF lock and therefore decode the SPDIF MPO0 output. I then connected the output to a device with an adaptive sample rate converter which was able to decode the signal but there was a zipper noise on the right channel modulated over the signal. Do I have the registers incorrectly setup for the DIT and what settings are required ?

Thank you in advance.

over 10 years ago

0 Justin Bohr over 10 years ago

TI__Mastermind 27990 points

Hi Peter,

To get the DIT output from MPO0 or MPO1, you must set one of those outputs to select the TXOUT as the output signal. This is done with setting register 78h to the right setting, either '1101' in the upper 4 bits (MPO1) or in the lower 4 bits (MPO0).

Justin

0 Peter Haynes over 10 years ago in reply to Justin Bohr

Prodigy 20 points

Justin,

Thank you fro responding, I am still unable to get SPDIF lock on the signal when the eval board is configured to TXOUT.

Thank you

Peter

0 Justin Bohr over 10 years ago in reply to Peter Haynes

TI__Mastermind 27990 points

Hi Peter,

Looking through the register settings it seems in register 60h DIT Function Control 1/3, the register should have the value 00010001, which is DIR system clock select and DIR bit clock, LR clock, and data source select. You have 01000001, which is AUXIN1 as the master clock. Try changing this to see if it corrects the issue.

Justin

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PCM9211 DIT configuration