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I2S Double the SCLK

abhipray

We are using a TI AIC audio codec interfacing with the nRF52 over I2S. 

The TI codec specifies the following expected clock frequencies for a sample rate of 16KHz and sample width of 16bits:

MCLK: 4.096MHz, BCLK: 1.024MHz, WCLK: 16KHz

Based on the nrf52832 I2S peripheral documentation, the following configuration will produce the closest settings:

mck_setup: NRF_I2S_MCK_32MDIV8 i.e 4MHz
ratio: NRF_I2S_RATIO_256X i.e 256
Therefore, LRCK = 15625 Hz
But, SCK = 2 * SWIDTH * LRCK = 500KHz which is half the required SCK. 

Am I making a mistake in these calculations? Is there any way I can double the SCK? The audio coming out is glitchy -- one of the audio channels is noisy and there are periodic clicks.

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  • 0 in reply to haakonsh

    Unfortunately the expected I2S clock frequencies in not in the datasheet for the TI AIC chip. Instead, they use a software tool called Pure Path Studio that in its documentation lists these frequencies. I can share the documentation page for the settings. 

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  </td>
  <td width="23%" style='width:23.24%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>2x
  Interpolation, 1x Decimation<o:p></o:p></span></p>
  </td>
 </tr>
</table>

<p class=style1 style='margin:0in;margin-bottom:.0001pt'><span class=cmttext><b
style='mso-bidi-font-weight:normal'><span style='font-size:10.0pt;font-family:
Arial'><o:p>&nbsp;</o:p></span></b></span></p>

<p style='margin-top:0in;margin-right:9.75pt;margin-bottom:0in;margin-left:
0in;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:Arial'>Changing
the CurrentRate property in the GDE will result in the GDE comparing the new
CurrentRate property value against the sampling rate currently supported by the
EVM firmware. If the requested sampling rate is different then the sampling
rate currently supported by the EVM firmware, the user will be prompted to
update the firmware. After the GDE updates the firmware on the EVM the user
must take the following actions:</span></p>

<p style='margin-top:0in;margin-right:9.75pt;margin-bottom:0in;margin-left:
0in;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:Arial'><o:p>&nbsp;</o:p></span></p>

<p style='margin-top:0in;margin-right:9.75pt;margin-bottom:0in;margin-left:
.5in;margin-bottom:.0001pt;text-indent:-.25in;mso-list:l0 level1 lfo2;
tab-stops:list .5in'><![if !supportLists]><span style='font-size:10.0pt;
font-family:Arial;mso-fareast-font-family:Arial'><span style='mso-list:Ignore'>1)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span
style='font-size:10.0pt;font-family:Arial'>Disconnect the GDE via the <i
style='mso-bidi-font-style:normal'>Build&#8594; Disconnect</i> menu option.<o:p></o:p></span></p>

<p style='margin-top:0in;margin-right:9.75pt;margin-bottom:0in;margin-left:
.5in;margin-bottom:.0001pt;text-indent:-.25in;mso-list:l0 level1 lfo2;
tab-stops:list .5in'><![if !supportLists]><span style='font-size:10.0pt;
font-family:Arial;mso-fareast-font-family:Arial'><span style='mso-list:Ignore'>2)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span
style='font-size:10.0pt;font-family:Arial'>Remove the EVM from the USB. <o:p></o:p></span></p>

<p style='margin-top:0in;margin-right:9.75pt;margin-bottom:0in;margin-left:
.5in;margin-bottom:.0001pt;text-indent:-.25in;mso-list:l0 level1 lfo2;
tab-stops:list .5in'><![if !supportLists]><span style='font-size:10.0pt;
font-family:Arial;mso-fareast-font-family:Arial'><span style='mso-list:Ignore'>3)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span
style='font-size:10.0pt;font-family:Arial'>Reconnect the EVM to the USB.<o:p></o:p></span></p>

<p style='margin-top:0in;margin-right:9.75pt;margin-bottom:0in;margin-left:
.5in;margin-bottom:.0001pt;text-indent:-.25in;mso-list:l0 level1 lfo2;
tab-stops:list .5in'><![if !supportLists]><span style='font-size:10.0pt;
font-family:Arial;mso-fareast-font-family:Arial'><span style='mso-list:Ignore'>4)<span
style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span
style='font-size:10.0pt;font-family:Arial'>Re-download the process flow.<o:p></o:p></span></p>

<p class=style1 style='margin:0in;margin-bottom:.0001pt'><span
style='font-size:10.0pt;font-family:Arial'><o:p>&nbsp;</o:p></span></p>

<h2><span style='font-size:10.0pt;font-family:Arial'>Expected Clock Frequencies<o:p></o:p></span></h2>

<p style='margin-top:0in;margin-right:19.5pt;margin-bottom:0in;margin-left:
0in;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:Arial'>Texas
Instruments EVM firmware support sampling rates up to 48 kHz. In order to configure
sampling rates above 48 kHz, an external source must be used to provide
MCLK/BCLK/WCLK. The following table shows the expected MCLK/BCLK/WCLK expected
by the framework.<o:p></o:p></span></p>

<p style='margin-top:0in;margin-right:19.5pt;margin-bottom:0in;margin-left:
0in;margin-bottom:.0001pt'><span style='font-size:10.0pt;font-family:Arial'><o:p>&nbsp;</o:p></span></p>

<table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0
 style='mso-cellspacing:0in;border:outset 1.0pt;mso-border-alt:outset windowtext .25pt;
 mso-padding-alt:1.5pt 1.5pt 1.5pt 1.5pt'>
 <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>
  <td style='background:#CCCCCC;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><b><span
  style='font-size:10.0pt;font-family:Arial'>Sample Rates<o:p></o:p></span></b></p>
  <p class=MsoNormal align=center style='text-align:center'><b><span
  style='font-size:10.0pt;font-family:Arial'>(Ksps)<o:p></o:p></span></b></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;background:#CCCCCC;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><b><span
  style='font-size:10.0pt;font-family:Arial'>MCLK<o:p></o:p></span></b></p>
  </td>
  <td width=96 valign=top style='width:1.0in;background:#CCCCCC;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><b><span
  style='font-size:10.0pt;font-family:Arial'>BCLK<o:p></o:p></span></b></p>
  </td>
  <td width=72 valign=top style='width:.75in;background:#CCCCCC;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><b><span
  style='font-size:10.0pt;font-family:Arial'>WCLK<o:p></o:p></span></b></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:1'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>8<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>4.096 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>512 kHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>8 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:2'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>11.025<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>5.6448 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>705.6 kHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>11.025 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:3'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>16<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>4.096 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>1.024 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>16 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:4'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>22.05<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>11.2896 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>1.4112 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>22.05 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:5'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>32<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>12.288 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>2.048 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>32 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:6'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>44.1<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>11.2896 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>2.8224 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>44.1 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:7'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>48<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>12.288 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>3.072 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>48 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:8'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>88.2<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>11.2896 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>5.6448 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>88.2 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:9'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>96<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>12.288 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>6.144 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>96 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:10'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>176.4<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>11.2896 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>11.2896 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>176.4 kHz<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:11;mso-yfti-lastrow:yes'>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>192<o:p></o:p></span></p>
  </td>
  <td width=84 valign=top style='width:63.1pt;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>12.288 MHz<o:p></o:p></span></p>
  </td>
  <td width=96 valign=top style='width:1.0in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>12.288 MHz<o:p></o:p></span></p>
  </td>
  <td width=72 valign=top style='width:.75in;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal align=center style='text-align:center'><span
  style='font-size:10.0pt;font-family:Arial'>192 kHz<o:p></o:p></span></p>
  </td>
 </tr>
</table>

<h2><span style='font-size:12.0pt;font-family:Arial'>Configurable Properties:<o:p></o:p></span></h2>

<table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 width="100%"
 style='width:100.0%;mso-cellspacing:0in;border:outset 1.0pt;mso-border-alt:
 outset windowtext .25pt;mso-padding-alt:1.5pt 1.5pt 1.5pt 1.5pt'>
 <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>
  <td width="29%" style='width:29.3%;background:#CCCCCC;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><b><span style='font-size:10.0pt;font-family:Arial'>Property</span></b><span
  style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></p>
  </td>
  <td width="70%" style='width:70.7%;background:#CCCCCC;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><b><span style='font-size:10.0pt;font-family:Arial'>Description</span></b><span
  style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:1'>
  <td width="29%" style='width:29.3%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>miniDSP_A_Adaptive<o:p></o:p></span></p>
  </td>
  <td width="70%" style='width:70.7%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>Enabled
  =&gt; Enable runtime coefficient memory switching (miniDSP_A)<o:p></o:p></span></p>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>Disabled
  =&gt; Disable runtime coefficient memory switching (miniDSP_A).<o:p></o:p></span></p>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'><o:p>&nbsp;</o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:2'>
  <td width="29%" style='width:29.3%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>miniDSP_D_Adaptive<o:p></o:p></span></p>
  </td>
  <td width="70%" style='width:70.7%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>Enabled
  =&gt; Enable runtime coefficient memory switching (miniDSP_D)<o:p></o:p></span></p>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>Disabled
  =&gt; Disable runtime coefficient memory switching (miniDSP_D)<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:3'>
  <td width="29%" style='width:29.3%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>miniDSP_A_Cycles<o:p></o:p></span></p>
  </td>
  <td width="70%" style='width:70.7%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>IADC
  value. This is the total number of cycles used by miniDSP_A per frame. If
  your process flow uses fewer cycles you can lower this value to save power
  consumption. The upper limit is equal to clock rate/ sampling rate. <o:p></o:p></span></p>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>Tip: Use
  View-&gt;Resource Window in GDE to check resource usage of a process flow<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:4'>
  <td width="29%" style='width:29.3%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>miniDSP_D_Cycles<o:p></o:p></span></p>
  </td>
  <td width="70%" style='width:70.7%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>IDAC value.
  This is the total number of cycles used by miniDSP_D per frame. If your
  process flow uses fewer cycles you can lower this value to save power
  consumption. The upper limit is equal to clock rate/ sampling rate.<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:5'>
  <td width="29%" style='width:29.3%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>SystemSettingsCode<o:p></o:p></span></p>
  </td>
  <td width="70%" style='width:70.7%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>User-editable
  text box to set register values<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:6'>
  <td width="29%" style='width:29.3%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>SynchMode<o:p></o:p></span></p>
  </td>
  <td width="70%" style='width:70.7%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>Enabled
  =&gt; miniDSP_A and miniDSP_D will run in lock-step mode. IADC=IDAC<o:p></o:p></span></p>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>Disabled
  =&gt; miniDSP_A and miniDSP_D will run asynchronous to each other.<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:7;mso-yfti-lastrow:yes'>
  <td width="29%" style='width:29.3%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>TargetBoard<o:p></o:p></span></p>
  </td>
  <td width="70%" style='width:70.7%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>Target
  EVM that is used. <o:p></o:p></span></p>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>TLV320AIC325xEVM-K
  (Complete EVM)<o:p></o:p></span></p>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>TLV320AIC325xEVM-U
  (small USB stick EVM)<o:p></o:p></span></p>
  </td>
 </tr>
</table>

<h2><span style='font-size:12.0pt;font-family:Arial'><o:p>&nbsp;</o:p></span></h2>

<h2><span style='font-size:12.0pt;font-family:Arial'><span
style='mso-spacerun:yes'>�</span>I2C Interface<o:p></o:p></span></h2>

<table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 width="100%"
 style='width:100.0%;mso-cellspacing:0in;border:outset 1.0pt;mso-border-alt:
 outset windowtext .25pt;mso-padding-alt:1.5pt 1.5pt 1.5pt 1.5pt'>
 <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>
  <td width="12%" style='width:12.06%;background:#CCCCCC;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><b><span style='font-size:10.0pt;font-family:Arial'>Property</span></b><span
  style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></p>
  </td>
  <td style='background:#CCCCCC;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><b><span style='font-size:10.0pt;font-family:Arial'>Description</span></b><span
  style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:1;mso-yfti-lastrow:yes'>
  <td width="12%" style='width:12.06%;padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'>None<o:p></o:p></span></p>
  </td>
  <td style='padding:1.5pt 1.5pt 1.5pt 1.5pt'>
  <p class=MsoNormal><span style='font-size:10.0pt;font-family:Arial'><o:p>&nbsp;</o:p></span></p>
  </td>
 </tr>
</table>

<p><span style='font-size:10.0pt;font-family:Arial'><o:p>&nbsp;</o:p></span></p>

<h2><span style='font-size:10.0pt;font-family:Arial'>&nbsp;<o:p></o:p></span></h2>

</div>

</body>

</html>


    The TI I2S device does support running I2S in master mode but I have not been able to get it to interface with the nrf52, the nrf52 I2S module does not receive any signals. I have reached out to TI for that. 

    Also does the nrf52 support hybrid mode? WCLK as output and BCLK as input?

  • 0 in reply to abhipray

    Update: running nrf52 as slave and the AIC as master works but still produces random clicks. 

  • +1 in reply to abhipray

    I'm a bit confused. The BCLK must be 16bit  * LRCLK * 2(stereo) = 16 * 16kHz * 2 = 512kHz. If BCLK is 1MHz then you would need to use two clock cycles to transfer one bit, which makes no sense. What am I missing?

    Are you using any alignment? (Width, alignment and format)


    The nRF52 does not support hybrid mode. 

  • 0 in reply to haakonsh

    Thanks for answering. It is strange that it requires BCLK twice as expected and I am checking with TI engineers on that. After some more testing, it actually seems to be working fine at the expected BCLK rate of 512KHz. 

  • 0 in reply to abhipray

    I'm glad to hear it works. It's probably a documentation bug on TIs side, it happens. 

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