CS3308 datasheet(17/44 Pages) CIRRUS

17 / 44 page

DS702F1

CS3308

5.4

Volume & Muting Control Architecture

The CS3308’s volume and muting control architecture provides the ability to control each channel on an

individual and master basis.

Individual control allows the volume and mute state of a single channel to be changed independently from

all other channels within the device. The CS3308 provides 8 individual volume and muting controls, each

permanently assigned to one channel within the device.

Master control allows the volume and mute state of multiple channels to be changed simultaneously with a

single register write. The CS3308 provides three master controls, and each may be configured to affect any

group of channels within a device.

Refer to the “Volume Controls” section beginning on page 19 and the “Muting Controls” section beginning

on page 21 for an in-depth description of the operation of the available controls.

5.4.1

Control Mapping Matrix

Figure 5 shows a conceptual drawing of the CS3308’s internal control-to-channel mapping matrix. Notice

that the individual channel controls are fixed to their respective channel, and the master controls may be

configured to affect any or all channels within the device.

Each master control has a corresponding Master X Mask register which allows the user to select which

channels are affected by the control. By default, each master control is configured to affect all channels

within the device. Referring to Figure 5 below, each configurable connection shown may be made and

broken by setting or clearing its corresponding bit in the control’s Master X Mask register.

The contents of the Master X Mask registers determine which channels are affected by both a master con-

trol’s volume and mute settings. Refer to the “Volume & Muting Control Implementation” section on

page 18 for a complete diagram of the CS3308’s volume and muting control architecture.

Channel 1

Channel 2

Channel 3

Channel 4

Channel 5

Channel 6

Channel 7

Channel 8

Master 1

Master 2

Master 3

Control Mapping Matrix

Volume & Muting

Controls

Ch. 1

Ch. 2

Ch. 3

Ch. 4

Ch. 5

Ch. 6

Ch. 7

Ch. 8

Configurable Connection

Fixed Connection

Analog

Gain/Attenuation

Stages

Figure 5. CS3308 Control Mapping Matrix

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