CS42L56 查看數據表（PDF） - Cirrus Logic

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CS42L56

Ultralow Power, Stereo Codec with Class H Headphone Amp

Cirrus Logic 

6.9.2

CS42L56

Analog Soft Ramp

Configures an incremental volume ramp from the current level to the new level at the specified rate.

ANLGSFT

0

1

Ramp Rate:

Volume Changes

Do not occur with a soft ramp

Occur with a soft ramp

1/8 dB every LRCK cycle

Affected Analog Volume Controls

PGAx_VOL[5:0] (“PGAx Volume” on page 78)

HPxMUTE (“Headphone Channel x Mute” on page 83)

HPxVOL[6:0] (“Headphone Volume Control” on page 84)

LINExMUTE (“Line Channel x Mute” on page 84)

LINExVOL[6:0] (“Line Volume Control” on page 84)

6.9.3

Analog Zero Cross

Configures when the signal level changes occur for the analog volume controls.

ANLGZCx

0

1

Volume Changes

Do not occur on a zero cross-

ing

Occur on a zero crossing

Affected Analog Volume Controls

PGAx_VOL[5:0] (“PGAx Volume” on page 78)

HPxMUTE (“Headphone Channel x Mute” on page 83)

HPxVOL[6:0] (“Headphone Volume Control” on page 84)

LINExMUTE (“Line Channel x Mute” on page 84)

LINExVOL[6:0] (“Line Volume Control” on page 84)

Note: If the signal does not encounter a zero crossing, the requested volume change will occur after a

timeout period between 1024 and 1536 sample periods (approximately 21.3 ms to 32 ms at 48 kHz sam-

ple rate).

6.9.4

Digital Soft Ramp

Configures an incremental volume ramp from the current level to the new level at the specified rate.

DIGSFT

0

1

Ramp Rate:

Volume Changes

Do not occur with a soft ramp

Occur with a soft ramp

1/8 dB every LRCK cycle

Affected Digital Volume Controls

ADCxMUTE (“ADC Mute” on page 76)

ADCxATT[7:0] (“ADCx Volume” on page 78)

AMIXxMUTE (“ADC Mixer Channel x Mute” on page 67)

AMIXxVOL[6:0] (“ADC Mixer Channel x Volume” on page 67)

PMIXxMUTE (“PCM Mixer Channel x Mute” on page 67)

PMIXxVOL[6:0] (“PCM Mixer Channel x Volume” on page 68)

MSTxMUTE (“Master Playback Mute” on page 67)

MSTxVOL[7:0] (“Master Volume Control” on page 70)

6.9.5

Freeze Registers

Configures a hold on all register settings.

FREEZE

0

1

Control Port Status

Register changes take effect immediately

Modifications may be made to all control port registers without the changes taking effect until after the

FREEZE is disabled.

Notes:

1. This bit should only be used to synchronize run-time controls, such as volume and mute, during

normal operation. Using this bit before the relevant circuitry begins normal operation could cause the

change to take effect immediately, ignoring the FREEZE bit.

DS851F2

63

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