emu10k1 and two i2s outputs - possible?

wedze · Mar 30, 2009, 11:07 AM

Hello,
Here is the emu10k1 pinout http://www-user.tu-chemnitz.de/~uwen.../full10k11.gif
In APS mode, pins 8 to 12 are used as i2s input/output, as opposed to ac97 link in Live! card. The live! card uses also pins 99-101 as i2s output for rear dac. If we could use them together it would be possible to connect two good DAC'a there without any expensive or hard to get spdif receivers. Also, do not forget about i2s inputs waiting for use

Here is the question for hardcore developers: is this doable? What is needed, changed firmware? Is this a problem?
Cheers

TravelRec. · Mar 30, 2009, 03:44 PM

SPDIF receivers and transmitters are not that expensive as you say. A good I2S-DAC is expensive too. To use the I2S-outputs, you have to connect only a 3.3V I2S-DAC on the SDataOut-pin, in parallel to the AC97-device. Since the DAC is almost a CMOS device, there is no problem. You have to connect the corresponding FrameSync and BitClock and MasterClock pins too and your DAC should be switched as a clock slave device. Dependent on the chip you use (Cirrus has some good DACs), you have to build a well layouted pcb onto the DAC has to fit with some active and/or passive components. The pcb should have a well decoupled power supply design. For the I2S-Inputs: they work without any modification, but the signals must be syncronous to the master clock of the card. All I2S input signals are physical input lines, so minimum one ADC module must be a clock master synced to the card, 2 other modules are clock slaves then. Check out also this thread: http://www.hardwareheaven.com/general-...0k2-cards.html

Mar 30, 2009, 11:07 AM	#1
wedze DriverHeaven Newbie Join Date: Mar 2009 Posts: 1 Rep Power: 0	emu10k1 and two i2s outputs - possible? Hello, Here is the emu10k1 pinout http://www-user.tu-chemnitz.de/~uwen.../full10k11.gif In APS mode, pins 8 to 12 are used as i2s input/output, as opposed to ac97 link in Live! card. The live! card uses also pins 99-101 as i2s output for rear dac. If we could use them together it would be possible to connect two good DAC'a there without any expensive or hard to get spdif receivers. Also, do not forget about i2s inputs waiting for use Here is the question for hardcore developers: is this doable? What is needed, changed firmware? Is this a problem? Cheers

Mar 30, 2009, 03:44 PM	#2
TravelRec. Alternative Audioproductions Join Date: Sep 2003 Location: Germany / Sachsen-Anhalt Posts: 1,703 Rep Power: 44	Re: emu10k1 and two i2s outputs - possible? SPDIF receivers and transmitters are not that expensive as you say. A good I2S-DAC is expensive too. To use the I2S-outputs, you have to connect only a 3.3V I2S-DAC on the SDataOut-pin, in parallel to the AC97-device. Since the DAC is almost a CMOS device, there is no problem. You have to connect the corresponding FrameSync and BitClock and MasterClock pins too and your DAC should be switched as a clock slave device. Dependent on the chip you use (Cirrus has some good DACs), you have to build a well layouted pcb onto the DAC has to fit with some active and/or passive components. The pcb should have a well decoupled power supply design. For the I2S-Inputs: they work without any modification, but the signals must be syncronous to the master clock of the card. All I2S input signals are physical input lines, so minimum one ADC module must be a clock master synced to the card, 2 other modules are clock slaves then. Check out also this thread: http://www.hardwareheaven.com/general-...0k2-cards.html __________________ Always take a look behind.