Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 73 - diyAudio
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Old 27th June 2012, 11:06 AM   #721
regal is offline regal  United States
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FW updates? Come on Just buy a second one.
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Old 27th June 2012, 01:35 PM   #722
qusp is offline qusp  Australia
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yes FW updates, I will not buy a second one till there is a multchannel one. …
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Old 27th June 2012, 11:31 PM   #723
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Default XO supply

II have designed a regulated power supply suitable for XO clock (XO on board).
I posted the schematic at The Well Regulated Power Supply
Now I'm going to order parts to build all prototype: TWRPS for FIFO buffer and TWRPS-XO for XO clock.

I would like to use a Crystek oscillator, but I can't find a suitable device for 44.1 kHz (11.2896 MHz considering fixed 256* master clock on the FIFO buffer). So I'm thinking to use a 45.1584 MHz Crystek oscillator and then divide by 4 with fast flip-flop.

What do you think about?

Andrea
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Old 28th June 2012, 12:44 AM   #724
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Default FW V3.80 will include the I2S backdoor

As all of you agree on opening the I2S input backdoor, I’m gonna include it in the GB II. The new firmware version will be V3.80. (V3.30 was for GB I, V3.50 includes 512Fs defult XO support, V3.6 has optional left justified output,V3.7 comes with optional left justified, 16/24bit right justified input supporting, V3.75 fixed a bug on switching between 44.1KHz and 48KHz with dual clock board running at dual speed mode).

I like what you got: “opening the I2S "backdoor" is all benefit and no downs”. Yes, for those who need it, it’s good news, for those who don’t, nothing changed.

Actually, the new fpga firmware just need sending a new group of instructions to DIX9211 opening the I2S input. It does not change any on the main FIFO logic. But I will still do a full set of tastings, just to make sure all functions are perfect.

Again, I’ll provide free upgrade service for all GB user within 1 year from purchases. User pay the round shipping. With a bubbled envelope, it won’t cost you much.

Thanks for DHL, giving me more 10 days upgrading the new firmware

Quote:
Originally Posted by zinsula View Post
Hi Ian,


2) I have rather another "issue" related to this source selection.
I'm planning to build the S/PDIF and FIFO with DAC into a Preamp, which can switch between analog line level sources and the built in DAC.
If i want to connect two digital sources to the S/PDIF input board (eg OPT and COX), the toggling functionality isn't really great and would not be compatible with the preamps input selection. For me, direct input selection would be better....
See, I'm kinda like your Boss ;-)

3) Regarding the connector, well one has to try...

Ciao, and thanks

Unforturnately, that backdoor wasn't there, my boss .
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Old 28th June 2012, 08:17 AM   #725
zinsula is offline zinsula  Switzerland
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Quote:
Originally Posted by iancanada View Post
[...]Unforturnately, that backdoor wasn't there, my boss .
No no, didn't want to play your boss ;-)

In that case, toggling has to be done.
To properly isolate it from preamp logic, i think about using an optical switch.
Can you tell me whether around 30 Ohms ON resistance is low enough to toggle?

And 2Hz toggling frequency with synchronous input indicator LED querying, would that be OK, or has it to be considerably slower?
Ie toggling pulse (opto relay switch closed) 250ms, open, check LED during around 150ms, and continue toggling after another 100ms if input is not the desired one.

Thank you!
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Last edited by zinsula; 28th June 2012 at 08:19 AM.
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Old 28th June 2012, 09:54 AM   #726
qusp is offline qusp  Australia
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you can switch a lot faster than that with the button
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Old 28th June 2012, 11:48 AM   #727
zinsula is offline zinsula  Switzerland
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Thanks. Faster is not required, my (and family member) patience is big enough to wait one or two seconds.
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Old 28th June 2012, 03:22 PM   #728
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Quote:
Originally Posted by iancanada View Post
.. V3.50 includes 512Fs defult XO support, ....
.
So I can use a Crystek CCHD-957 at 22.5792 MHz as MCLK in my project: CD PRO transport (44.1 khz) --> FIFO Buffer --> NPC5842.
Is that right?

Andrea
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Old 28th June 2012, 03:40 PM   #729
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correct, thats what i'm using for the moment
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Old 28th June 2012, 04:07 PM   #730
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Quote:
Originally Posted by qusp View Post
correct, thats what i'm using for the moment
Hi qusp,

are you using a miserable 44.1 khz source!?!?!?!?!?!?!?!?!?
I think we are a jurassic example in digital audio, whereas now almost all people use PC as a source.
Which DAC chip are you using?

Andrea
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