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Old 4th February 2012, 02:37 PM   #11
phofman is offline phofman  Czech Republic
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Quote:
Originally Posted by castleeric View Post
VIA Envy24 HT has DAC funtion. I chouse it because it support dual XO(48,44.1 base) input. But I will not use DAC function. There is I2S RJ45 connector on broad.
Are you sure there are built-in DA convertors in that chip?
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Old 4th February 2012, 04:03 PM   #12
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Thanks for your reminding. I make misstake the 4 pairs PSDOUT(0:3) is serial data output. They may need AC97 codec . I will not use them any way but focus on I2S and SPDIF.
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Old 4th February 2012, 04:27 PM   #13
phofman is offline phofman  Czech Republic
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Quote:
Originally Posted by castleeric View Post
... focus on I2S and SPDIF.
Do you know about the undocumented 176.4kHz->88.2kHz bug in SPDIF output of Envy24HT? I think that is the main reason ESI Juli@ and Infrasonic Quartet use additional Xilinx for clock generation and switch the Envy chip to external clock.
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Old 4th February 2012, 10:21 PM   #14
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Hi Phofman
Thank you very much for your input. I realy need that. I checked the discussion on internet. I will try make vt1724 driver run at 1100: 176.4 KHz (forces to 128x mode only),MT02[3]=1 (128X) and search IC vendor support. If it can not work I prefer simple solution 176.4kHz->88.2kHz.
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Old 5th February 2012, 08:54 AM   #15
phofman is offline phofman  Czech Republic
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Quote:
Originally Posted by castleeric View Post
I will try make vt1724 driver run at 1100: 176.4 KHz (forces to 128x mode only),MT02[3]=1 (128X)
That is the correct setup, I do not know of any other for 176.4kHz. All the Envy24 cards without the xilinx clock I had in my hands skip every second sample on SPDIF output, outputing "quasi" 88.2kHz stream. The I2S line seemed OK running at 174.6 when I checked with a scope.
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Old 5th February 2012, 01:42 PM   #16
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Is it possible cause of "CCS05: AC-Link Configuration"? The bit 7 Type. 0: AC'97 1: IS.
Reflects power-up status of pin 50 during reset cycle in reverse polarity. Can be overwritten. I think running at 176.4 valid when CCS05[7] is 1.
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Old 5th February 2012, 05:47 PM   #17
phofman is offline phofman  Czech Republic
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Quote:
Originally Posted by castleeric View Post
Is it possible cause of "CCS05: AC-Link Configuration"? The bit 7 Type. 0: AC'97 1: IS.
Reflects power-up status of pin 50 during reset cycle in reverse polarity. Can be overwritten. I think running at 176.4 valid when CCS05[7] is 1.
All the cards I have come across use I2S. This bit is fixed to 1 for them in the driver.
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Old 5th February 2012, 07:50 PM   #18
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Quote:
Originally Posted by castleeric View Post
VIA Envy24 HT has DAC funtion. I chouse it because it support dual XO(48,44.1 base) input. But I will not use DAC function. There is I2S RJ45 connector on broad.
If you tend to carry I2S signal to the RJ45 socket, I2S tracks may get longer comparing possible shorter length. If you can offer additional female pin headers for a doughter "dac board" just nearby Envy24 chip, it would be more effective way to do this job.
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Last edited by terranigma; 5th February 2012 at 07:59 PM.
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Old 6th February 2012, 12:24 AM   #19
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Thanks for your sugesstion of considering expansion DAC internal box. I will reverse I2S pin socket near by IC output. I should cancel the RJ45 fe-connector, But it not easey to mount on panel, so I prefer let it on broad mount to panel.

Quote:
Originally Posted by terranigma View Post
If you tend to carry I2S signal to the RJ45 socket, I2S tracks may get longer comparing possible shorter length. If you can offer additional female pin headers for a doughter "dac board" just nearby Envy24 chip, it would be more effective way to do this job.
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Old 6th February 2012, 12:28 AM   #20
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I will develop the project under linux enviroment. So, Can you shar more precious experience? Have same problem on linux ?
Quote:
Originally Posted by phofman View Post
All the cards I have come across use I2S. This bit is fixed to 1 for them in the driver.
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