XMOS-based Asynchronous USB to I2S interface

[lindamar]

Dear Lorien,

I would love to know if you have still boards available (USB to I2S). That´d be 1 unit shipped to Spain.

Thanks
Pepe

[suffolk tony]

Originally Posted by m.massimo

I've just received Lucian's board.
First thing to say is about Lucian, a very kind person, and then, excellent packaging and quick shipping. The card manufacturing is of high quality, professional, I'd say.

So I guess you've now got the components you were waiting for Lucien? Really looking forward to getting my board!

[m.massimo]

Originally Posted by suffolk tony

So I guess you've now got the components you were waiting for Lucien? Really looking forward to getting my board!

Hi Tony, I suppose there's a misunderstanding. I never posted in this thread about WaveIO. All the messages with Lucian were on a private basis. However I got the board in a month or so after payment.

[storrgie]

I'm curious to know about users experiences with different DAC kits. I would like to purchase a WaveIO board.

I don't mind building from a kit, however I do not have the necessary expertise to design or fabricate PCB. I would also prefer not to bread board the unit.

I saw this site: Analog Metric - DIY Audio Kit which seems to sell many DAC kits.

I would appreciate any recommendations!

If you have experience with pre-built DACs that take I2S that would be interesting also. I would eventually like for these units to be inside enclosures.

I personally own a Schiit Bifrost and an Ibasso D7. I feel like this could be an interesting project and I require another DAC for my dedicated stereo.

[gabanyayaya]

Originally Posted by audiodesign

Have someone build a comparison test with coax output and IL715 outputs ?

t
I would like to hear this opinion too from others who have tested at this area...

[m.massimo]

A question for Wolfsin or whoever is successfully using WaveIO with a TP Opus 8740 module.
I don't get any output from the dac (but the module works fine with Teralink X2 I2S output) and WaveIO output clocks signals seems ok (non-isolated).
Which hardware setting are you using on Opus8740 with WaveIO?
Mine is a typical stereo (I2S high, dsd low, deemph low, mode low, iwo high, diffhw low, fsel off, mute off, osr off)
Thanks.

[hochopeper]

I don't think Wolfsin has actually connected to the 8740 modules yet.

I am hoping to try it out with 8741 within the next week or so, exact timing depends how the power supply testing goes tomorrow. No smoke could mean I'll have feedback in a few days.

I think pinocchio was doing something with WaveIO and Opus boards ... haven't heard about any results yet though.

[m.massimo]

Well, reading 8740 and 8741 datasheets I noted this peculiar difference:

8740
The WM8740 supports data input word lenghts from 16 to 24 bits and sampling rates up to 192 kHz

8741
The WM8741 supports PCM data input word lenghts from 16 to 32 bits and sampling rates up to 192 kHz

If I'm not wrong, I remember that Lucian told that WaveIO I2S output is 32bits.

Could it be that difference the problem with 8740?

[Lorien]

If I'm not wrong, I remember that Lucian told that WaveIO I2S output is 32bits.

Yes, but from that 32 bits only 24 are used. I2S Data is left aligned (except the first bit after the Left/Right transition) while the rest of them are zero padded. You can see descriptions of I2S interface here, at page 13 (bottom) and here, at page 23, below the I2S Mode paragraph.
At first sight you ave to make sure that your DAC chip has Audio Input format configured to 24-bit I2S data (pin 28 & pin 23 = High).
Kind regards,
L

[m.massimo]

Problem seems solved.
I used I2S cables lenght of 170mm at the beginning in order to have the chance to be able to move the board in case of need.
I've cut the cable to 70mm and now I got analogue output on the scope.
With X2 I used a I2S cat5 cable of about 150mm with no problem, so I started with a similar length, but it's clearly not sustainable in this new setup.
Thank to Lucian for the time dedicated and help by mail.