CS44L10

DS541PP1

19

4.8 Volume and Mixing Control (address 09h)

4.8.1 RAMP SPEED (RMP_SP)

Default = 01

00 - Ramp speed = approximately 0.1 seconds

01 - Ramp speed = approximately 0.2 seconds

10 - Ramp speed = approximately 0.3 seconds

11 - Ramp speed = approximately 0.65 seconds

Function:

This feature is used in Single Ended applications to reduce pops in the output caused by the DC-blocking

capacitor. When in control port mode, the Ramp Speed sets the time for the PWM signal to linearly ramp

up and down from the bias point (50% PWM duty cycle). Refer to Section 6.4.

4.8.2 ATAPI CHANNEL MIXING AND MUTING (ATAPI)

Default = 1001 - HP_A = L, HP_B = R (Stereo)

Function:

The CS44L10 implements the channel mixing functions of the ATAPI CD-ROM specification. Refer to

Table 10 and Figure 5 for additional information.

Note: All mixing functions occur prior to the digital volume control.

76543

210

Reserved

Reserved

RMP_SP1

RMP_SP0

ATAPI3

ATAPI2

ATAPI1

ATAPI0

00001

001

ATAPI3

ATAPI2

ATAPI1

ATAPI0

HP_A

HP_B

00

00

MUTE

MUTE

00

01

MUTE

R

00

10

MUTE

L

00

11

MUTE

[(L+R)/2]

01

00

R

MUTE

01

01

R

R

01

10

R

L

01

11

R

[(L+R)/2]

10

00

L

MUTE

10

01

L

R

10

10

L

L

10

11

L

[(L+R)/2]

11

00

[(L+R)/2]

MUTE

11

01

[(L+R)/2]

R

11

10

[(L+R)/2]

L

11

11

[(L+R)/2]

[(L+R)/2]

Table 10. ATAPI Decode