ADAU1442 Flexible TDM6 Configuration with ASRC

Hi tompdx,

tompdx wrote:

2) Is it possible to have 16bit TDM6 as your flexible TDM?

In Flexible TDM mode, the serial port expects to receive 32 slots of 8 bits each, for a total of 256 bits, and it will reserve the first 8 channels of the serial inputs.

From ADAU144x datasheet:

In flexible TDM mode, each flexible TDM stream includes 32 bytes (called slots) of information for every frame on the frame clock.

In your intended use case, you want 6 x 16 = 96 bits. Since this doesn't match with the expected 256 bits, I'm not sure if it will work. There is a chance, however, that it could possibly work in slave, because all of the serial port logic is based on counters. It's possible that a new incoming frame clock edge would reset the counters back to zero even though a full 256 bits hasn't arrived yet. We've just never tested the flexible TDM mode with anything except 256 bits per sample, so I don't know if it will work or not.

You could give it a try! The settings would be as follows:

Register 0xE1080: 0000000001000000

Register 0xE1081: 0000000001000010

Register 0xE1082: 0000000001000100

Register 0xE1083: 0000000001000110

Register 0xE1084: 0000000001001000

Register 0xE1085: 0000000001001010

Once the audio channels are in the routing matrix, you can route them anywhere. So...

tompdx wrote:

1) Is it possible to have flexible TDM combined with ASRC?

Yes.

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Thank you,
EZ Admin