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CM6631 usb audio interface .... any good ?
CM6631 usb audio interface .... any good ?
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Old 22nd June 2018, 04:34 PM   #701
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Very nice. You may have raised the bar for what people want and expect from a USB audio interface card. Assuming of course, it doesn't cost so much nobody or few will want one.
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Old 22nd June 2018, 04:42 PM   #702
3lite is offline 3lite  Poland
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Join Date: May 2016
It is far from being expensive, but even if it is for someone I don't mind it at all It was fun to overclock CM6631A that much up to 768 kHz PCM and to allow it to transfer DSD256 via DoP with final decoding for separate channels and clock.

I do only play music from a computer and I do not need anything more that this interface can provide.
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Old 23rd June 2018, 04:47 AM   #703
phi112358 is offline phi112358
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THe firmware saved my a$$et. Cannot thank those in this thread enough. Love y'all. Love this site!

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Old 8th July 2018, 05:25 PM   #704
3lite is offline 3lite  Poland
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Join Date: May 2016
Another quite interesting achievement - native DSD512 playback using CM6631A - YouTube

The project is finally done It supports PCM playback up to 768 kHz without any decimation and DSD64, DSD128, DSD256 via DoP and DSD512 via a native method (raw data alt set descriptor).

Originally Posted by 3lite View Post
An update for my project

Base PCB:

Click the image to open in full size.

It can run in both USB Audio Class 1.0 or 2.0 (selectable by a jumper).

Dimensions and pinout are pretty much the same as Amanero.

Addon with an FPGA:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

It extends the base PCB with following features:

- Actual playback of 768 kHz and 705,6 kHz.
- DSD64, DSD128 and DSD256 support via DoP with seperate outputs and DSD clock (DSDL + DSDR + DSDCK).
- Serial DATA output. It does allow to connect directly any PCM DAC, e.g. in NOS mode.
- I2S output.
- Left-justified output.
- BCLK rate can be chosen between 64x and 32x Fs. Rate of 32x Fs allows to play 768 kHz files via PCM56 or 384 kHz via TDA1541(A) using serial DATA outputs.
- SPDIF output (generated on the fly directly from the incoming stream). It can generate the stream up to 384 kHz.
- Every format has an inverted output as well (connecting bunch of DAC's to create XLR output is not an issue).
- MCLK rate of 128x Fs for every sampling rate except for 705.6 kHz and 768 kHz (which is 64x Fs).
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