Cirrus Logic CDB4271 - Manual (Page 14)

CDB4271
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3.2 Advanced Window
Clicking the “Advanced...” button on the main window will launch a graphical register map of
the CS4271. Changes made to the register map will be immediately reflected in the main win-
dow, so you may wish to arrange them so that they do not obscure each other. When in I
2
C
mode, the “Update” button will read the registers of the CS4271 and update the Advanced
Register Settings box to match. See Figure 3 below.
3.3 I²C Mode No Acknowledge Error
The control port of the CS4271 requires the presence of an MCLK signal for correct opera-
tion. Because of this, if the board is set up to receive MCLK from a source that isn’t actively
providing the signal, a no acknowledge error may result. This means that the GUI is expecting
an acknowledgement from the CS4271, but isn’t receiving it. If this occurs, ensure that the
appropriate source of MCLK is providing the signal. For example, if the board is set up to re-
ceive MCLK from the header, be sure that there is an active MCLK signal applied to the
MCLK position on the header (J26). See Figure 4 below.
Figure 3. Advanced Window
Figure 4. I²C Error Message