Cirrus Logic CS3318 - Manual (Page 17)

DS693F1 17
CS3318
5.4 Volume & Muting Control Architecture
The CS3318’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 CS3318 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 CS3318 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 CS3318’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 CS3318’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. CS3318 Control Mapping Matrix