Hacking the CM6632A-based Asus Xonar U7 - diyAudio
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Old 24th February 2014, 07:41 AM   #1
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Default Hacking the CM6632A-based Asus Xonar U7

Hello, has anyone tried to grab the four I2S streams coming from the CM6632A chip inside the Asus Xonar U7 USB-audio attachement ?

Let's be 100% modular. Say we allocate one DSP+DAC module to each speaker. This way, in case there are six speakers, we need six DSP+DAC modules.
Each DSP chip could be a PIC32MX1, a PIC32MZ, a STM32F4 or an Infineon XMC4000.
We need two I2S at the output, for splitting the audio channel into four channels.
The DACs could be anything like two ES9023.
The audio clock would be centralized, one quartz acting as master in the asynchronous audio modality.
Each DSP+DAC module could be credit-card sized.
One could stack eight DSP+DAC modules, using four straps for selecting one of the four I2S streams, plus one strap for telling the DSP if we want to process the left or the right signal.

Some more hardware would grab the SPI or I2C acting inside the Asus Xonar U7, for defining the listening volumes.

Is this feasible?
Can somebody post a picture of the PCB of the Asus Xonar U7, especially the region between the CM6632A and the four stereo DACs ?
Is galvanic isolation provided by the Asus Xonar U7?
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Old 27th January 2015, 06:59 AM   #2
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ASUS Xonar U7 USB SoundCard Review
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