WM8958 datasheet(73/377 Pages) WOLFSON

73 / 377 page

Pre-Production

WM8958

PP, August 2012, Rev 3.4

The control sequence for disabling the MBC is described in Table 25. It is recommended that the

applicable DAC playback path is muted during this sequence, as described below.

STEP

DESCRIPTION

NOTES

Mute the applicable DAC output(s)

The DAC Volume and Mute controls are

described in Table 58.

Set MBC_ENA = 0

Un-mute the applicable DAC output(s)

Set DSP2_ENA = 0

Set DSP2CLK_ENA = 0

Table 25 MBC Disable Sequence

The control sequence for updating the MBC configuration parameters is described in Table 26. It is

recommended that the applicable DAC playback paths are muted during this sequence, as described

below.

The same sequence is required when reading the MBC configuration parameters; note that readback

of these registers is not possible when the MBC function is active.

STEP

DESCRIPTION

NOTES

Mute the applicable DAC output(s)

The DAC Volume and Mute controls are

described in Table 58. (If changing the MBC

from one signal path to another, then both

DAC paths should be muted.)

Set MBC_ENA = 0

Write DSP2_STOP = 1

Readback the MBC configuration

parameters

Refer to WISCE™ for register settings.

Set Register R2568 (0A08h) = 007Bh

Set Register R2569 (0A09h) = 0007h

Set Register R2570 (0A0Ah) = 0073h

Set the configuration parameters

Refer to WISCE™ for register settings.

Note that these actions are only required for

user-specific MBC configuration.

Write DSP2_RUNR = 1

Set MBC_SEL

For AIF1DAC1 path, set MBC_SEL = 00.

For AIF1DAC2 path, set MBC_SEL = 01.

For AIF2DAC path, set MBC_SEL = 10.

Set MBC_ENA = 1

Un-mute the applicable DAC output(s)

Table 26 MBC Update / Readback Sequence

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