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Old 29th February 2008, 09:58 PM   #131
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Looks awesome Russ! I can't wait for you guys to release this if you do end up releasing it. Or if you need any beta testers I'm open
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Old 29th February 2008, 10:46 PM   #132
rossl is offline rossl  United States
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Project Buffalo... hmmm ...



On my demo board I connected the I2S to all four inputs.

Dustin described that in a post several pages back. It was the long post about configuring that last register to use 6,7,8,or 9 bit DACs.

When it is in SPDIF mode it autoconfigures for stereo, and you can use it the way you have it on the schematic.
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Old 29th February 2008, 10:51 PM   #133
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Quote:
Originally posted by rossl
Project Buffalo... hmmm ...



On my demo board I connected the I2S to all four inputs.

Dustin described that in a post several pages back. It was the long post about configuring that last register to use 6,7,8,or 9 bit DACs.

When it is in SPDIF mode it autoconfigures for stereo, and you can use it the way you have it on the schematic.
Yes a name only a hockey fan can truly appreciate.

Ah thanks for that tip, somehow I missed it!
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Old 29th February 2008, 11:01 PM   #134
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Ross,

I guess that means supporting stereo DSD as well as PCM will be a little tricky too. As I will likely have to run DSD1 to DSD3,5,7 and DSD2 to DSD4,6,8.

Ah well, more work to be done.
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Old 29th February 2008, 11:06 PM   #135
rossl is offline rossl  United States
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You just need 47K pulldowns on pins 55, 56, and 57. Then put 3 more pins on your digital connector.

Then, if you use SPDIF, you close the SPDIF switch and everything is OK.

If you want I2S, you open the SPDIF switch and connect the stereo I2S data so it goes to all 4 of the pins 55,56,57,and 58.

For DSD you need pulldowns and pins for everything.
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Old 29th February 2008, 11:07 PM   #136
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So your going to have 4 outputs ran to each channel correct? To get the lowest possible noise floor?
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Old 29th February 2008, 11:13 PM   #137
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Quote:
Originally posted by rossl
You just need 47K pulldowns on pins 55, 56, and 57. Then put 3 more pins on your digital connector.

Then, if you use SPDIF, you close the SPDIF switch and everything is OK.

If you want I2S, you open the SPDIF switch and connect the stereo I2S data so it goes to all 4 of the pins 55,56,57,and 58.

For DSD you need pulldowns and pins for everything.
It not so much switching between SPDIF and PCM I am worried about.
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Old 29th February 2008, 11:14 PM   #138
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Quote:
Originally posted by Dougie085
So your going to have 4 outputs ran to each channel correct? To get the lowest possible noise floor?

Yes.
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Old 29th February 2008, 11:30 PM   #139
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Quote:
Originally posted by rossl
For DSD you need pulldowns and pins for everything.
Yes, I reached the same conclusion, I will probably go that route but I am still trying to think of something more slick. Not sure I can though.

Only thing I can think of is to use some tristate switches.

Cheers!
Russ
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Old 29th February 2008, 11:40 PM   #140
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A good use for your PIC controller
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