Sony to Philips I2S Format Conversion

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kimschips

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Joined 2004
Thanks

just to sum up

You can say that Sony CXD2500 EIAJ format is almost the same as Burr-Brown standard 16bit format-> 2s compliments MSB first?

The dac will not notice the Zeroes between 16bit and 48 or 64bit from the CXD2500?

Then is free to choose 64bit or 48bit from CXD2500?

Kim
 
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rfbrw

Member
Joined 2001
kimschips said:
Thanks

just to sum up

You can say that Sony CXD2500 EIAJ format is almost the same as Burr-Brown standard 16bit format-> 2s compliments MSB first?

The dac will not notice the Zeroes between 16bit and 48 or 64bit from the CXD2500?

Then is free to choose 64bit or 48bit from CXD2500?

Kim
Click to expand...


So long as the data is LSB justified and there is at least one BCK cycle per bit it will work. When set to Standard fmt 16bit, the last 16bits before a transistion of LRCK will be converted.
You cannot use the 64Fs BCK output directly. It is LSB first.
 
R

rfbrw

Member
Joined 2001
Re: I2S for Audio Alchemy

Valery said:
Hi all,
I'm also have difficulty to connect CXD2545 or TDA7220 or whatever to Audio Alchemy DAC via I2S input. In attached file there is 5 pins I2S input, so how do I have to connect devices?
Valery.

Here: http://www.yasmina.ru/aai.jpg
Click to expand...


If you mean the SAA7220, then the output is 4x oversampled,and you can't send that to the dac.
The CXD2545 requires a little logic to make its ouput compatible with the I2S format.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=25177&perpage=10&pagenumber=1
 
K

kimschips

Member
Joined 2004
Hello:confused:

So long as the data is LSB justified and there is at least one BCK cycle per bit it will work. When set to Standard fmt 16bit, the last 16bits before a transistion of LRCK will be converted.
Click to expand...

PS: in my servicemanual the 48bit output from CXD2500 is used

So the 48bit format from the CXD2500 is also LSB justified and fit perfect to a pcm1798 dac chip in the settings 16bit standard format??

Best regards
Kim
 
K

kimschips

Member
Joined 2004
rfbrw said:



So long as the data is LSB justified and there is at least one BCK cycle per bit it will work. When set to Standard fmt 16bit, the last 16bits before a transistion of LRCK will be converted.
You cannot use the 64Fs BCK output directly. It is LSB first.
Click to expand...


I have looked at the 4 format.
I am very confused now why:
Many says that the output format from the sony is (forget 64bit)
48Bit 2s complement MSB first->Leftjustified
or

48bit 2s complement MSB first->Right justified
or

48bit 2S complement MSB first-> LSB justified

If you must use PCM1798 your settings could be:
16bit Standard 2s complent MSB first Leftjustified??

16bit starndard 2s complement MSB first right justified??

Please let´s clear up the formats once and for all:bawling:

Kim
 
R

rfbrw

Member
Joined 2001
All that matters is what is in the datasheet and the datasheet says 2's comp MSB first. The LSB occupies the last bit cell position in the frame therefore it is LSB or Right justified.
 

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kimschips

Member
Joined 2004
rfbrw said:
All that matters is what is in the datasheet and the datasheet says 2's comp MSB first. The LSB occupies the last bit cell position in the frame therefore it is LSB or Right justified.
Click to expand...

Hello rfbrw

Sorry for all my questens I think I understand it now:rolleyes:

I overlooked page 16 and 17 in the datasheet for PCM1798 what settings connect to the CXD2500(48bit output):
16bit right justified also called LSB justified standard format, MSB first 2s complement :angel:

Yes it´s clear now:eek:

My next understanding:D
How can you see from the formats curves, that the differents between EIAJ and I2S. that LRCLK is delayed 7 BCLK cycles??

Best regards
Thanks for all
Kim
 
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rfbrw

Member
Joined 2001
kimschips said:



My next understanding:D
How can you see from the formats curves, that the differents between EIAJ and I2S. that LRCLK is delayed 7 BCLK cycles??

Best regards
Thanks for all
Kim
Click to expand...


It is the difference between where the MSB is and where you want it to be. In the case of the CXD2500, there is a transistion of LRCK and 8 BCK cycles later the MSB appears. In the case of I2S the MSB appears after 1 BCK cycle. Delay the transition for 7 cycles and the MSB appears 1 cycle later. Invert LRCK and you have conformed with the I2S standard.
 
K

kimschips

Member
Joined 2004
Hello all.
It´s working rfbrw!!

My setup is CXD2500->PCM1798->Zapfilter2->XO2 clock (16.93Mhz).

Sound is great very clear with a lot off details and no harsch sound.

Just one questen:

What if I try with AD1955:

I can see it can handle 48Khz and 256FS so new clock
->12.288Mhz

Can it work in Hardwaremode like PCM1798??

I think it could be nice to compare som different dac chips like
PCM1798
AD1955
CS4398 Hardwaremode?

Best regards
Kim
 
I

ingab

Member
Joined 2003
Hello to all.

I read with interest all the post and would want to make a question. I have an old CDP with chipset Sony (in particulary DSP CX23035 - DAC CX20133).
Is it possible to connect the CX23035 's output at an other circuit with CS8412 and CS4329 chips.

Thanx in advance for replay.

Andrea
 
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rfbrw

Member
Joined 2001
ingab said:
Hello to all.

I read with interest all the post and would want to make a question. I have an old CDP with chipset Sony (in particulary DSP CX23035 - DAC CX20133).
Is it possible to connect the CX23035 's output at an other circuit with CS8412 and CS4329 chips.

Thanx in advance for replay.

Andrea
Click to expand...


Does it also have a CX23034?
 
R

rfbrw

Member
Joined 2001
Without the datasheet for the CX23035, I can't say whether it has a digital output suitable for use with the CS8412 but you can probably add a SPDIF tx if it hasn't. Perhaps someone in the forum with a DCD1500 has an answer. The early version used the CX23035.
 
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