WM8946 datasheet(33/173 Pages) CIRRUS

33 / 173 page

WM8946

Rev 4.5

DSP CORE

DSP Core is at the centre of the ADC / DAC / Digital Audio Interface (I2S) blocks. It provides signal

routing, and also implements a number of configurable signal processing functions.

The signal processing functions are arranged in three blocks, as follows:



Signal Enhancement 1 (SE1) - Low-pass / High-pass filter, 3D-stereo enhancement, 5 notch

filters, generic ‘Direct-Form 1’ filter.



Signal Enhancement 2 (SE2) - ReTune

™ processing, 5-band equalizer.



Signal Enhancement 3 (SE3) - Dynamic range control

The DSP Configuration modes and each of the Signal Enhancement blocks is described in the

following sections.

DSP CONFIGURATION MODES

The DSP Configuration Mode is determined using the SE_CONFIG register field; this configures the

signal paths between the Signal Enhancement blocks and the ADC / DAC / I2S interfaces. The

supported DSP modes are illustrated in Figure 13.

DAC R

DAC L

DIGITAL AUDIO

INTERFACE

ADC R

ADC L

DIGITAL AUDIO

INTERFACE

ADC R

ADC L

DAC R

DAC L

DIGITAL AUDIO

INTERFACE

ADC R

ADC L

SE2 (HPF,

Re-Tune, 5-band EQ)

DAC R

DAC L

DIGITAL AUDIO

INTERFACE

ADC R

ADC L

SE2 (HPF,

Re-Tune, 5-band EQ)

SE3 (Dynamic

Range Control)

DAC R

DAC L

DSP Record Mode

DSP Playback Mode

DSP General Mode 1

DSP General Mode 2

SE1 (LPF/HPF,

3D surround, 5-notch, DF1)

SE2 (HPF,

Re-Tune, 5-band EQ)

SE3 (Dynamic

Range Control)

SE1 (LPF/HPF,

3D surround, 5-notch, DF1)

SE2 (HPF,

Re-Tune, 5-band EQ)

SE3 (Dynamic

Range Control)

SE1 (LPF/HPF,

3D surround, 5-notch, DF1)

SE1 (LPF/HPF,

3D surround, 5-notch, DF1)

SE3 (Dynamic

Range Control)

Figure 13 DSP Configuration Modes

Record mode enables the entire set of Signal Enhancement functions in the ADC path. The direct

DAC path is also active, without any Signal Enhancement functions; this allows basic audio playback

and digital beep generation.

Playback mode enables the entire set of DSP functions in the DAC path. The direct ADC path is also

active, without any DSP functions; this allows basic audio record functions to the host system.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R64 (40h)

SE Config

Selection

3:0

SE_CONFIG

[3:0]

0000

DSP Configuration Mode select

0000 = Record mode

0001 = Playback mode

0010 = Reserved

0011 = Reserved

Table 12 DSP Configuration Mode Select

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