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CS8406 SPI problem
CS8406 SPI problem
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Old 30th August 2011, 02:32 PM   #11
Wavelength is offline Wavelength  United States
diyAudio Member
Join Date: Feb 2004
Location: Zinzinnati
Originally Posted by mstro View Post
unfortunately i'm going on holiday for 3 days so there is no time for testing with the cs8416 till monday/tuesday but i can give you a short introduction about the xmos part of this project.

The whole project is an xmos based usb audio streaming application for the moment with s/pdif transmitter/receiver.
The streaming part is based on the xmos usb audio 2.0 reference design for 2 input and 2 output channels with up to 192kHz/24Bit.
I'm running it in difference to the ref design with a 400Mhz XS1 Device.
There are some customer wishes on the board, don't think i'm allowed to talk about them.
The xmos platform gives great possibilities. It takes some time to learn this special xc language for programming them in an efficient way. But now i'm loving these processors

There are some weird things with channel status and the 8406. But I guess the big question is why use it at all? Why not just output SPDIF from the XMOS?

The other thing is that the 8406 needs to be reclocked on the output, for some reason it has some jitter issues with the supplies, clocking and buffering that need to be cleaned up.

J. Gordon Rankin
Wavelength Audio, ltd.
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Old 30th August 2011, 03:21 PM   #12
mstro is offline mstro  Germany
diyAudio Member
Join Date: Mar 2011
The CS8406 is for evaluation purposes on that prototype pcb. There's a way to bypass it and use the XMOS for S/PDIF TX. The problem of XMOS S/PDIF is that it takes a whole Thread and when using the XUD Library you'll be only able to use 5 Threads with a 400MHz Type. So untill the 500MHz Controllers arrive i have to use the CS8406.

Well thats interesting going to do a jitter measurement when everything works fine
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