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Old 8th May 2012, 10:43 AM   #461
vzs is offline vzs  Europe
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Hi Ian,

A question about supported frequencies:
- Can the new FIFO firmware and clock board support 192fs, 384fs and 768fs frequencies?

I was checking SM5847 datasheet page 18 (which I plan to use if I can get my hands on one) and 176.4KHz and 192KHz are only supported on 192fs.

I know that this board cannot support everything but would be a nice feature though.

Thanks,
Zsolt
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Old 8th May 2012, 10:48 AM   #462
qusp is offline qusp  Australia
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I really think that we are in danger of making this unit useless by everybody throwing their hat into the ring for requests. we have a saying here, not sure of the origin,

'Jack of all trades, master of none'
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Old 8th May 2012, 11:17 AM   #463
vzs is offline vzs  Europe
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Quote:
Originally Posted by qusp View Post
I really think that we are in danger of making this unit useless by everybody throwing their hat into the ring for requests. we have a saying here, not sure of the origin,

'Jack of all trades, master of none'
...can be extended with:
"Certainly better than a master of one"

One is 4x and the other is 3x above the bit clock frequency. Doesn't seem for me such an ex-centric request.
I mentioned, it's a nice to have feature -even if in a future firmware update- like the Left Justified support is in the current.

Last edited by vzs; 8th May 2012 at 11:23 AM.
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Old 8th May 2012, 11:23 AM   #464
regal is offline regal  United States
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Originally Posted by iancanada View Post
Upgrading job finished finally. Two weekends were killedJ. New version will include the following features:

1. Optional 32bit left-justified output format support
Reason of this feature: To integrate FIFO with some DSPs or DACs which do not accept I2S input, for example, PMD100, SM5842, SM5843Ö

2. Optional 16-32bit left-justified input format support
Optional 16bit right-justified input format support
Optional 24bit right-justified input format support
Reason of these features: To interface FIFO with some digital audio frontend which do not output I2S. For example, interfacing with some DIRs from Japanese manufacturers, tapping signals form CDROMÖ

3. New optional default 512*Fs MCLK support
Only Single XO clock board user will benefit from this feature. Dual XO clock board will take over all the default *Fs settings.
Reason of this feature: Single XO clock board users will have more options to select frequencies. For examples, use 22.5792MHz oscillator for 44.1KHz Fs or 24.5760Mhz for 48Khz, and so on. And same XO will work for 88.2Khz or 96Khz either, just a jumper! .

All new features are jumper selectable. Only FPGA/CPLD firmware is involved in this upgrading. Hardware keeps no change. If you are happy with I2S and donít need these new features, then you donít need making any upgrading. Performance didnít change any.

Testing FPGA board was upgraded at same time to perform loop test.

I attached the waveform of new support formats just for reference.

Have a good night.
Sounds like the 24 bit MSB first L&R are assessable simultaneously to run a stereo pair of PCM1704? this is great.

But for the PMD100/SM5842 guys who will be redbook only (PMD100/hdcd is redbook) this chip only accepts 256fs and 384fs not 512fs, so I don't think wev'e gained anything here as far as plugging into a classic PMD100 based DAC.
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Old 8th May 2012, 11:46 AM   #465
regal is offline regal  United States
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Quote:
Originally Posted by qusp View Post
I really think that we are in danger of making this unit useless by everybody throwing their hat into the ring for requests. we have a saying here, not sure of the origin,

'Jack of all trades, master of none'
Completely disagree, master of S-D DAC's is all thats alternative to this Fifo now, which to many is a master of none.

There is a lot of potential here which could benefit many who's only option has been a bunch of 90's tech jittery glue logic.
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Old 8th May 2012, 01:12 PM   #466
qusp is offline qusp  Australia
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get a grip regal, seriously mate, where does the functionality end? its quite incredible how bitter you are and about what? because your precious dac topology is getting passed or over on occasion? I ignored your veiled, threatening, accusatory and deluded PM on behalf of the nos, R2R or external filter? mafia because I didnt want to give you acknowledgement, it was truly funny.

(yes I was PM'd accused of having unnamed ulterior motives and pushing development towards the sabre; told that people were wondering (shill? not sure the accusation was pretty vague) and the hundreds thousands, millions? (bites pinky) of other users and their dacs that must have attention instead and Regal was apparently elected the mouthpiece to pass this friendly message on?; this rant was delivered as if I had some sort of control of the outcome, or other motive other than just liking to use my dac with hardware I have in my possession. ignoring the fact that the thing pushing development in that direction was Ian exploring the limits of the device, an obvious interest in trying the buff/sabre and thus an interest in how they worked together, not me)

so you disagree that endless requests are not productive? I dont see you doing the work, I just see you making the requests to be catered for by a great member who likles to help people and I see him and his time being taken for granted TBH. have you noticed that Ian has actually bought a buff 3? you still think i'm the one pushing development in that direction as an option? I havent posted in here for ages and theres just page after page of different functions and then when I dare to suggest that might be enough I get this ****?

pretty delicious irony dont you think?

Last edited by qusp; 8th May 2012 at 01:40 PM.
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Old 8th May 2012, 01:51 PM   #467
zinsula is offline zinsula  Switzerland
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Calm down guys.
Apart that, just to make clear, the upgrade is not about L-R splitting, stopping clock etc. which would be necessary for NON OS.
That would be another board which Zsolt and myself have discussed with Ian. You cannot connect the AD or BB R2R DAC's directly.

Btw, it has not to be NONOS.....anyone of you has a suggestion for a software which would oversample 44.1/16 to 88.2.....192 kHz offline and store the files in the new format? So we can avoid the digital filters...
On this website, there are only comparisons of conversions from 96 to 44.1. Is it safe to say that a good "downsampler" is also a good oversampler?
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Old 8th May 2012, 02:16 PM   #468
qusp is offline qusp  Australia
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what operating system? how about puremusic? I do any upsampling in realtime in general with PM, so cant really report on its offline functionality. it uses 64bit apodising filters, I would assume you wanted apodising?

hey look man, I dont have a specific problem with your request, I just see a LOT of requests/suggestions being made, meanwhile i'm getting very strange messages telling me to back off and telling ME that i'm being selfish and I havent asked for anything in ages, think the last thing I actually asked for (and really it was just a suggestion for improvement) it was the u.fl or w.fl connectors. everything else is just optimizing it for the sabre and i'm hardly the only person using it with ESS, so how does that make me selfish? in fact I was EXPECTED to report on and suggest improvements for the unit with my dacs...which...strangely.... are sabres. sabre sabre sabre sabre sabre 9012, 9018 sabre sabre 9012

Last edited by qusp; 8th May 2012 at 02:26 PM.
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Old 8th May 2012, 03:31 PM   #469
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Quote:
Originally Posted by vzs View Post
Hi Ian,

Nice work and thank you for sacrificing two weekends (at least) for hobby - with a full time job and family I know this is hard

I plan to try different digital filters before my AD1865 and will start with DF1704 as that is the easiest to interface with my current setup and FIFO as it supports LVTTL and has I2S input. I would also like to try SM5842(7) and/or PMD100 so I will need the Left Justified output support as well.

Others might have asked: can existing FIFOs be upgraded with your new firmware? You are probably using JTAG for this, for ~15$ there are plenty of AVR JTAG programmers on ebay.

Thank you,
Zsolt
Thanks Vzs,

Upgrading is free. Both re-programming and loop testing are required. I need confirm each bit is perfect for different formats after upgrading. Just send it back to me in a bubbled envelope. That will be much cheaper than in a box. I don't need cables and clock board. Just the FIFO board. I'll sent the upgrated board back to you in the same envelope. That would be easier for both of us. You still keep me address tag?

Regards,
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Old 8th May 2012, 03:56 PM   #470
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Quote:
Originally Posted by vzs View Post
Hi Ian,

A question about supported frequencies:
- Can the new FIFO firmware and clock board support 192fs, 384fs and 768fs frequencies?

I was checking SM5847 datasheet page 18 (which I plan to use if I can get my hands on one) and 176.4KHz and 192KHz are only supported on 192fs.

I know that this board cannot support everything but would be a nice feature though.

Thanks,
Zsolt
Hi Zsolt,

The FIFO board support 128,256,512 and 1024fs. Both new and old firmware are. But I can not support 192,384 and 768fs. The internal logic is based on /2,/4,/8/16... If add /3,/6 the Fmax will be suffer. I'm concerned about the performance.
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