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Old 1st November 2017, 01:39 AM   #311
ichiban is offline ichiban  United States
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Introducing the bit "Teleporter"
Default Tele's and I2S transmission

I recall reading that ether Brian or Russ had transmitted I2S over quite some distance with no problems.
How does that jib with keeping I2S signals from source to dac as short as possible?
I would like to remote the BBB/Hermes/Cronus, but . . .
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Old 1st November 2017, 03:57 AM   #312
francolargo is offline francolargo  United States
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Quote:
Originally Posted by ichiban View Post
I recall reading that ether Brian or Russ had transmitted I2S over quite some distance with no problems.
How does that jib with keeping I2S signals from source to dac as short as possible?
I would like to remote the BBB/Hermes/Cronus, but . . .
It works well for me by keeping the I2S connections as short as possible between Cronus or B3 and the teleporter. ...like, ~3 cm max. and soldered. The length of cat6 cable between teleporters is not an issue (within reason).

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Old 1st November 2017, 04:08 AM   #313
ichiban is offline ichiban  United States
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Introducing the bit "Teleporter"
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It works well for me by keeping the I2S connections as short as possible between Cronus or B3 and the teleporter. ...like, ~3 cm max. and soldered. The length of cat6 cable between teleporters is not an issue.
I guess getting my head around I2S traveling multiple feet without a problem and more than a couple of inches to the dac is a problem?
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Old 1st November 2017, 09:02 PM   #314
ichiban is offline ichiban  United States
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Introducing the bit "Teleporter"
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I guess getting my head around I2S traveling multiple feet without a problem and more than a couple of inches to the dac is a problem?
Would it be that the Teleporters drive the signal with more current to avoid capacitive losses, compared to the Cronus outputs?
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Old 1st November 2017, 09:12 PM   #315
BrianDonegan is offline BrianDonegan  United States
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Introducing the bit "Teleporter"
The main reason for keeping the I2S lines short is that they are all pulsed clock lines (except for Data, but that's just as bad) and not only interfere with other nets, but with each other, through radiated noise.

The LVDS signals between Teleporters are differential, so far less susceptible to interference and noise. In addition, when send via twisted pairs in a sheilded cable, they are much less likely to radiate harmful interference to other nearby nets.
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Old 2nd November 2017, 01:56 AM   #316
ichiban is offline ichiban  United States
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Introducing the bit "Teleporter"
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less likely to radiate harmful interference to other nearby nets.
OK, then.
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Old 30th November 2017, 09:00 AM   #317
janho12345 is offline janho12345  Germany
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Hi,

I need LVDS MCLK signals to be fed into soekris dam1121 from LVCMOS MCKL out of the cronus reclocker.


This transporter has a TI DS91M040 and will translate the LVCMOS to LVDS right? It is possible to use it just for this purpose? It will give out one LDVS signal only right?




Thank you very much,
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Old 30th November 2017, 02:25 PM   #318
Russ White is offline Russ White  United States
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You can use 0-4 of the channels. Up to you. Take a look at the datasheet for more info.
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Old 30th November 2017, 02:57 PM   #319
janho12345 is offline janho12345  Germany
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You can use 0-4 of the channels. Up to you. Take a look at the datasheet for more info.
Thank you!


I can not get LVDS MCKL out of the Crouns directly (as you just updated the board with buffers) do I?


Is there another data sheet than the few lines about the teleporter in buffalo assembly pdf? - Sorry can't find another.


One more thing, excuse me if i'm wrong: Aren't the Data and word of the i2s interface always a LVDS?
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Old 30th November 2017, 04:42 PM   #320
Russ White is offline Russ White  United States
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Cronus does not do any LVDS - never has It is CMOS.
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