Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board - Page 4 - diyAudio
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Old 2nd October 2012, 09:54 PM   #31
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Quote:
Originally Posted by regal View Post
Yep, anyway you look at it, there is potential here for better things, a new direction for home audio, more potential than relying on propretary code or lone-wolf code burned to FPGA's.
Agree,

Ian
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Old 2nd October 2012, 09:57 PM   #32
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Default Revised block diagram

Sorry, forgot put the DLn, DRn on the block diagram. Actually they were shown on the PCB silkscreen. Good eye! Here is the revised block diagram.

Inside my FPGA/CPLD design, DLn and DRn are not simply inverted by NOT buffers. They were synchronized by MCLK with the same raising edge. So, there is no delay between DL and DLn, as well as DR and DRn.

Yes, this feature is useful for configuring NOS DACs working at differential mode. It's very easy to setup two or four DACs into dual mono mode with those signals.

Ian
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File Type: png BlockDiagram.png (60.5 KB, 991 views)
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Old 8th October 2012, 09:32 PM   #33
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Default Testing result of PCM1704 timing from logic analyzer

To get perfect timing for PCM1704, after 24 bit DL and DR shifted into left and right PCM1704, LLLR will go low, CLK will be continued for two additional times before stopped. This is because the special timing requirement of PCM1704. Please see the datasheet of PCM1704 for details. I also attached the waveform from the datasheet. Please correct me if there is anything wrong.

All of the signals will keep low for rest of time to reduce the noise. Please see the waveform from my logic analyzer.

Jumper settings:
J24bit: shorted
JTAIL: shorted
Rest jumpers: keep open
Attached Images
File Type: png PCM1704INTERFACE.png (74.9 KB, 695 views)
File Type: png PCM1704TIMING.png (13.0 KB, 667 views)
File Type: png PCM1704DatasheetTiming.png (30.2 KB, 651 views)
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Old 16th October 2012, 12:50 AM   #34
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Hi Vzs, Hi zinsula

Thank you so much for accepting my invitation to evaluate the daughter board. Shipped today. You should receive them in ten days. Iím looking forward to your good news, as well as fixing the bugsJ.

Ian
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Old 16th October 2012, 09:46 AM   #35
vzs is offline vzs  Europe
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Thank you for letting me evaluate this nice board.

Zsolt
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Old 16th October 2012, 02:54 PM   #36
zinsula is offline zinsula  Switzerland
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Thank you Ian, very kind of you!
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Old 17th October 2012, 10:33 PM   #37
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Count me for 4 pcs.
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Old 17th October 2012, 11:01 PM   #38
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Quote:
Originally Posted by andrea_mori View Post
Count me for 4 pcs.
Thanks andrea_mori, it seems NOS fans are much less than DS .

I'm not sure if there is enough requirements to support a factory SMT run. But at lease I can consider supplying un-assembled mini KIT.

Two gentlemen gonna make some evaluation on the daughter board. Will make decesion after that.

Good luck.

Ian
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Old 18th October 2012, 06:24 PM   #39
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Ian do you know aproximate price?
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Old 18th October 2012, 06:27 PM   #40
rtd is offline rtd  France
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I Might be interested too (not afraid of smt soldering )
So up for aproximate price too !
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