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Old 26th November 2011, 05:11 PM   #31
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Default Standardizing I2S

I have an idea: let's agree on pin assignments for the I2S cable so our stuff can play nice with each other when we meet at Rocky Mountain / Burning Amp / etc.
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Old 27th November 2011, 04:39 AM   #32
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Hmmm not a bad idea.

The ideal order for PCM into Buffalo II/III would be:

0 - bit clock
1 - word clock
2 - data
3 - optional master clock (typically not used)

For DSD it would be:

0 - bit clock
1 - data left
2 - data right
3 - (unused for asynchronous stereo - but could possibly be master clock)

That may be a good place to start.
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Old 27th November 2011, 06:25 PM   #33
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I was thinking of ethernet cable definitions, so your list would map to this (as per TIA/EIA 568B):

0: pins 1,2 (1 = orange-white, 2 = orange)
1: pins 3,6 (3 = green-white, 6 = green)
2: pins 4,5 (4 = blue, 5 = blue-white)
3: pins 7,8 (7 = brown-white, 8 = brown)

Note that one pair (pins 3,6) is NOT contiguous on the RJ-45 connector! People using Teleporters want to make sure they respect this wiring, since signal integrity depends on the positive and negative of differential signals traveling on their own twisted pair.

You want to make sure pin 1 at the transmit end corresponds to pin 1 at receive - that's the sort of mistake I often make, so heads-up.

Last edited by DSP_Geek; 27th November 2011 at 06:29 PM.
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Old 27th November 2011, 07:09 PM   #34
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As I said earlier I already have the RJ45 connector routed so that the CAT5 twisted pairs are utilized.

No further effort is required on that front.
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Old 27th November 2011, 07:27 PM   #35
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Quote:
Originally Posted by Russ White View Post
As I said earlier I already have the RJ45 connector routed so that the CAT5 twisted pairs are utilized.

No further effort is required on that front.
Aaaah, I'd missed that. Thanks for the tip.

By the way, could I order the board without the RJ-45 so I could solder it onto an Ethercon?

Last edited by DSP_Geek; 27th November 2011 at 07:56 PM.
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Old 27th November 2011, 09:20 PM   #36
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Russ, I have been interested in lvds i2s for some time and have the format as an output option on my music servers. I put together an i2s database in case it's of use to anyone:
https://spreadsheets.google.com/spre...nc&output=html

I would like to add your device to the database, but I have some questions
1. What is the pin assignment of the RJ45 connector?
2. What frequency are the oscillators that generate the master clock for the pcm signals when used with your USB module?
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Old 27th November 2011, 09:28 PM   #37
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The RJ45 is a through hole part and optional for you to install- at least I am pretty sure we will do it that way. There is a 2x4 .1" header spot just in front of it that you can use in any case even if you decide to mount the RJ45 connector and later decide not use it.

The header also comes in handy for in-case module to module routing. This can be a nice solution where you might otherwise need to run several inches of wiring for sensitive TTL signals.
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Old 27th November 2011, 09:43 PM   #38
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The signal mapping to channels is arbitrary. It is totally up to the user.

The mapping of LVDS channels to the RJ45 connect is this:

RJ45 Pin : LVDS Signal

1 : B0
2 : A0
3 : B2
4 : B1
5 : A1
6 : A2
7 : B3
8 : A3

We are not decided on the final frequency for the new USB module. But it will likely be 90.3168Mhz and 98.304 Mhz depending on the base sample rate.
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Old 28th November 2011, 01:43 AM   #39
glt is offline glt  United States
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Russ, what is the part number? (to take a look at the data sheet). Thanks...
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Old 28th November 2011, 02:09 AM   #40
Jokener is offline Jokener  Germany
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I want 10 of these... NOW... :-)

Just in case I am blind and/or read the thread without processing the information: is there a release date yet?
I don't really care about the price, new toys are in order this christmas!

Best regards,
Jokener
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