24 channels USB to I2S interface (with Source codes, ASIO/VHDL/Schematic) - Page 7 - diyAudio
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Old 18th December 2011, 05:17 AM   #61
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I got my CY7C68013A already, not opened.

Maybe this design can work for 96k with ASIO driver + high priority thread.
I know how to write ASIO driver and how it works now..

I'm using ExpressPCB - Free PCB layout software - Low cost circuit boards - Top quality PCB manufacturing
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Old 22nd August 2012, 05:27 PM   #62
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Default Current status of the 24 channel project.

A couple of questions.

I going to need 23 channels for a 7.2 3way system.
So I would need 44100*24bits*24channels / 8 bits = 3.2 MB/s minimum?
192k*24*24 / 8 bits = 14 MB/s
386k*24*24 / 8 bits = 28 MB/s max

1. Will the parts do this?

2. Confused on the choice of Sync/Async FIFO chips. Not many high speed 32 pin chips, they are all 64 pin.

3. Do all the parts have to be at the same frequency?

I was thinking of going with a
Isolator SI8420BB-D-IS at 8ns 150MHz
FIFO CY7C421-20JXC at 10ns 100MHz
FTDI UM2232H
FPGA I don't know

Last edited by EternaLightWith; 22nd August 2012 at 05:42 PM.
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Old 22nd August 2012, 09:48 PM   #63
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Hi
1. 24 channel 44.1kHz will work, I tested. but not sure about 192K and 386K.
2. I used ASYNC FIFO. maybe
IDT72V06L15JG IDT, Integrated Device Technology Inc | 800-2145-ND | DigiKey
can work.
3. no, UM2232H is working on USB clock, FPGA is working on I2S clock. ASYNC FIFO separates clock area.
good luck,
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Old 29th August 2012, 06:24 PM   #64
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Hi
why do you need 24 channels, pls? And where do you get 24 channel sources?
I am just curious because i have never seen audio cd/dvd/br etc with 24 channels
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Old 30th August 2012, 04:47 PM   #65
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For 7.1 surround sound crossovers. 8 channels * 3 drivers per cabinet. = 24 channels ( well 22 Subwoofer cab only need one channel)

not use sound card, use software and USB out to digital amp.

Thank you for digital amp KOON, was looking at 22 DACs. Ouch



Quote:
Originally Posted by tremBITa View Post
Hi
why do you need 24 channels, pls? And where do you get 24 channel sources?
I am just curious because i have never seen audio cd/dvd/br etc with 24 channels
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Old 30th August 2012, 06:56 PM   #66
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Quote:
Originally Posted by EternaLightWith View Post
3 drivers per cabinet.
Do you mean a "cabinet" is a speaker cabinet with 3 drivers == High Freq, Middle and the Bass? Right? 3 channels per speaker?
Than you are going to have 24 channel preamp and 24 channel amp?
OMG!

Then the setup probably would go close to the following : The Greatest Show on Earth! | Home Theater

Hm. I am not sure that I am personally ready to go so far. Anyway it is interesting
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Old 30th August 2012, 07:32 PM   #67
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If I needed 24 DACs then yes it would be bad, (lowest I've seen was $30 per channel)

But with KOON digital amp, no need to buy expensive DAC kits.

ClassD with Texas D/A converter in a chip
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Old 15th October 2012, 09:05 PM   #68
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Filled out my shopping cart at Future Electronics. Got everything I need for like $80.

Only thing left is the FPGA. DLP-HS-FPGA2 so expensive. Can I get something else cheaper?

I noticed several FPGA kits being thrown around, but was there an agreement on the best one? And well, it has to be minimum of trouble in replacing FTDI one.

Sincerely,

David P

Edit: Hey guess what, it seems like DLP came out with the FPGA3 back in June 2012. It intergrates Xilinx FPGA with FTDI's 2232H chip. $210 at digikey.

Last edited by EternaLightWith; 15th October 2012 at 09:18 PM.
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Old 15th October 2012, 09:36 PM   #69
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Hi
Cheap FPGA Module: XuLA-200 Spartan-3A Prototyping Board with 1.2V, 200,000-gate FPGA XuLA-200 will be most cheap one.

DLP-HS-FPGA3: it is expensive but now Channel A of FT2232H is connected to FPGA.
This channel can be used for fast transfer, so don't have to place one more FTDI.
and some FIFO can be implemented in FPGA or with RAM. = very simple board
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Old 15th October 2012, 09:54 PM   #70
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I think I will go for XuLA2-LX25
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