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New XMOS Multichannel PCB
New XMOS Multichannel PCB
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Old 20th April 2016, 04:43 PM   #11
ejaouen is offline ejaouen  France
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anybody tested the multichannel (up to 8ch) playback on linux ?
which channels does the vumeter measure (can we choose the measured channels) ?
thanks
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Old 20th April 2016, 04:59 PM   #12
Jensen567 is offline Jensen567  United States
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This seems like it might be the perfect USB reciever I have been looking for. Plan to interface with a TI PCM1863 ADC and a PCM5242 DAC. DimDim, can you confirm that you get both an input and an output under recording devices and playback devices respectively in Windows? I only need stereo in and out for now.
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Old 20th April 2016, 08:46 PM   #13
Dimdim is offline Dimdim  Greece
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New XMOS Multichannel PCB
Yes, I can confirm that.

Click the image to open in full size.

I have in fact done simultaneous playback and recording in Windows 10 64bit. But you will have to slave the ADC to the XMOS.
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Old 20th April 2016, 08:47 PM   #14
Jensen567 is offline Jensen567  United States
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Thanks very much, your replies have been really helpful in this and the other XMOS thread.
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Old 20th April 2016, 08:58 PM   #15
Dimdim is offline Dimdim  Greece
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New XMOS Multichannel PCB
You are very welcome, it's been my pleasure.

You should also keep in mind that the BCLK & LRCK signals will need to be shared by both your DAC and ADC.
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Old 20th April 2016, 08:59 PM   #16
diyaudnut is offline diyaudnut  United States
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Hi Dimdim,

How does this board handle the I2S interface clocking?
Can it receive an external master clock?

Further can the I2S interface be easily isolated and reclocked?

I am trying to see if i can use this with an ESS9018 multichannel DAC board which can operate in synchronous mode
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Old 20th April 2016, 09:08 PM   #17
Dimdim is offline Dimdim  Greece
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New XMOS Multichannel PCB
AFAIK with the firmware that comes with the board there is no way for it to receive an external MCLK. You have to use it pretty much as-is.

I suspect that XMOS provides the tools necessary for creating a custom firmware that could support external MCLK, but I also suspect that actually making such a firmware would not be easy.

Isolation & reclocking should not be a problem. We are talking about standard I2S lines.
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Old 21st April 2016, 09:26 AM   #18
APK is offline APK  United Kingdom
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Iím still a novice regarding the digital side of audio, however I came across this application note for interfacing high speed ADCs with xCORE devices, http://www.google.com/url?sa=t&rct=j...b3f1ig&cad=rja
Which would suggest that it can receive an external clock frequent of 100Mhz and output this to slave the ESS9018. Just dont aks me how
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Old 21st April 2016, 03:25 PM   #19
diyaudnut is offline diyaudnut  United States
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Just learnt that Ian from the jitter reduction FIFO thread is developing a multichannel USB to I2S with isolation and reclocking.
Thanks Guys.
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Old 22nd April 2016, 09:14 PM   #20
xaled is offline xaled
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Default Firmware for TDM I2S Mode

The web page says:

"Maximum 32 channels can be supported if the user flash the XMOS with TDM I2S capable firmware"

Any info on where to get this firmware?
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