TLV320AIC3100: TLV320AIC3100

Jeff, I need to know the actual bytes in the messages to set and get data from specific registers. 

I am trying to hard code this into my firmware. 

What registers need to be programmed to configure the device and a I2S slave (clocked by the DSP)

Hi Bruce,

I'm not sure exactly what configuration you're going for, but if you want this to drive an I2S slave you need to set Register 33 to output the internal BCLK and WCLK rather than receiving the clock as an input. You'll also need to refer to the clock tree to ensure that your clock requirements are met. You can use this calculator tool to help: https://www.ti.com/tool/download/SLAR163

The actual bytes as you mention are displayed in the "read window." From that example, registers 0x23 and 0x24 contain 0x00 and 0x40 respectively.

Best regards,
Jeff McPherson

Maybe I wasn’t clear. I want the Tlv320auc3100  to be the slave. 

I am wanting MCLK, BCLK, LRclk to all be generated by an external (DSP) device and the AIC3111 to be the slave

Please explain how to interpret the "Clock Routing" page of the Codec Control GUI.
When I select


am I selecting external clock sources for the device.
I want my DSP device to create all the clocks and drive the AIC3100.

The Command generated when selecting (what I believe is external clocking) is W 30 1B 0C 
This is for register 27

Yet Page 0 Register 27 bit description does not agree with this 0C value.


Please advise

Hi Bruce,

The GUI is backwards. Apologies for the confusion. By default the device is in slave mode. You do not need to interact with the clock routing window for BCLK WCLK, and MCLK to be driven externally.

Best regards,
Jeff McPherson

How would I know this?  When will they fix the gui? This is really bad for a new user. 

If the codec defaults to I2S slave , do I need to set bit rate and word length or will it just follow the external clocks?

I agree it's confusing, but this GUI is no longer actively supported by our software group so it likely will not be updated any time soon sadly.

I'm not sure if you're referring to a specific register with "bit-rate" but the word length will determine the resolution I2S data the codec expects/transmits. That will need to be set but otherwise the codec will respond to whatever clocks you give it when it's in slave mode. 

Best regards,
Jeff McPherson

Too bad about the (lack of) GUI support. This is a great device and when I get it working it will save me a lot of cost in out new product design. I’ll try what you suggested and open a new thread if I get stuck.