CS44800 datasheet(53/80 Pages) CIRRUS

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DS632F1

CS44800

7.5

Misc. Configuration (address 04h)

7.5.1

Digital Interface Format (DIFX)

Default = 001

Function:

These bits select the digital interface format used for the DAI Serial Port. The required relationship be-

tween the Left/Right clock, serial clock, and serial data is defined by the Digital Interface Format and the

options are detailed in Figures 17 - 22.

7.5.2

AM Frequency Hopping (AM_FREQ_HOP)

Default = 0

Function:

Enables the modulator to alter the PWM switch timings to remove interference when the desired frequen-

cy from an AM tuner is positioned near the PWM switching rate. The PWM modulator circuitry must first

be powered down using the PDN bit in the Clock Configuration and Power Control (address 02h) Register

before this feature can be enabled. There will be a delay following the power-up sequence due to the re-

locking of the SRC. Once this feature is enabled, the output switch rate is divided by 2.25, resulting in a

lowered PWM switch rate. Care should be taken to ensure that:

PWM_MCLK / 16 > the upper frequency limit of the AM tuner used

7.5.3

Freeze Controls (FREEZE)

Default = 0

Function:

This function will freeze the previous output of, and allow modifications to be made to the Master Volume

Control (address 07h-08h), Channel XX Volume Control (address 09h-12h), and Channel Mute (address

13h) registers without the changes taking effect until the FREEZE bit is disabled. To make multiple chang-

es in these control port registers take effect simultaneously, enable the FREEZE bit, make all register

changes, then disable the FREEZE bit.

765

DIF2

DIF1

DIF0

RESERVED

AM_FREQ_HOP

FREEZE

DEM1

DEM0

DIF2

DIF1

DIF0

Description

Figure

Left-Justified, up to 24-bit data

I²S, up to 24-bit data

Right-Justified, 16-bit data

Right-Justified, 24-bit data

One-Line mode #1, 20-bit data

One-Line mode #2, 24-bit data

TDM Mode, up to 32-bit data

Table 5. Digital Audio Interface Formats

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