PCM9211: Configure MPIO_B as I2S master to generate I2S clock to other audio device

Wiky Liao

Part Number: PCM9211

Hi Team,

May I know how to configure PCM9211 into I2S master mode and generate I2S clock via MPIO_B? We need output audio clock(BCLK/LRCLK) to other audio device. The crystal is 24.576MHz in XTI/XTO pin. Thanks.

Best Regard.

Wiky

over 3 years ago

0 Wiky Liao over 3 years ago

TI__Intellectual 1550 points

Hi team,

Could you help to comments here? thanks.

Best Regards.

Wiky

0 Wiky Liao over 3 years ago in reply to Wiky Liao

TI__Intellectual 1550 points

Hi Team,

Update the require flow as below. Crystal as clock source, the MCLK/BCK/LRCLK clock is output at B0/B1/B2, but B3 is SDIN.

Best Regards

Wiky

0 Aaron Estrada over 3 years ago in reply to Wiky Liao

TI__Mastermind 22950 points

Hello Wiky,

Apologies for the delayed response. The main support engineer for this device is out at the moment and this slipped through.

Is the main goal to operate the ADC as master? If so, it is my understanding that the ADC can only operate as master and output clocks on MPIO_C pins.

Regards,

Aaron

0 Wiky Liao over 3 years ago in reply to Aaron Estrada

TI__Intellectual 1550 points

Hi Aaron,

If only MPIO_C support the clock output, how to do configuration here? We can try to do modify at schematic.

Best Regards.

Wiky

0 Zak Kaye over 3 years ago in reply to Wiky Liao

TI__Mastermind 23050 points

Hi Wiky,

An important thing to understand is that the Auxiliary inputs are designed to be driven in clock slave mode while all Auxiliary outputs can only operate in master mode. MPIO_B supports a special mode called 'External Slave ADC Input' though that sets the clocks to be outputs and the data to be an input. This is the mode you will want to use, and only MPIO_B supports this setting. You can configure this in register 0x6F by writing 101 to the MPBSEL bits. By default register 42 (ADCLK) is set to use XTI as the clock source so you should not need to adjust this.

Best,

Zak

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PCM9211: Configure MPIO_B as I2S master to generate I2S clock to other audio device