CS44800 datasheet(56/81 Pages) CIRRUS

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DS632PP1

CS44800

7.8

Master Volume Control - Integer (address 07h)

7.8.1

Master Volume Control - Integer (MSTR_IVOL[7:0])

Default = 00000000

Function:

The Master Volume Control - Integer register allows global control of the signal levels on all channels in

1 dB increments from +24 to -127 dB. Volume settings are decoded as shown in Table 6. The volume

changes are implemented as specified by the Soft and Zero Cross bits (SZC[1:0]). All volume settings

greater than 00011000b are equivalent to +24 dB. Binary values for integer volume settings less than

0 dB are in two’s complement form.

7.9

Master Volume Control - Fraction (address 08h)

7.9.1

Master Volume Control - Fraction (MSTR_FVOL[1:0])

Default = 00

00 - +0.00 dB

01 - +0.25 dB

10 - +0.50 dB

11 - +0.75 dB

Function:

The Master Volume Control - Fraction register is an additional offset to the value in the Master Volume

Control - Integer register and allows global control of the signal levels on all channels in 0.25 dB incre-

ments. Volume settings are decoded as shown in Table 7. These volume changes are implemented as

specified by the Soft and Zero Cross bits (SZC[1:0]). All volume settings greater than 00011000b are

equivalent to +24 dB. Binary values for integer and fractional volume settings less than 0 dB are in two’s

complement form.

To calculate from a positive decimal integer:fraction value to a binary positive integer:fraction value, do

the following:

1. Convert the decimal integer to binary. This is MSTR_IVOL[7:0].

2. Select the bit representation of the desired 0.25 fractional increment. This is MSTR_FVOL[1:0].

To calculate from a negative decimal integer:fraction value to a binary, 2’s complement integer:fraction

value, do the following:

MSTR_IVOL7

MSTR_IVOL6

MSTR_IVOL5

MSTR_IVOL4

MSTR_IVOL3

MSTR_IVOL2

MSTR_IVOL1

MSTR_IVOL0

MSTR_IVOL[7:0]

Hex Value

Volume Setting

0001 1000

+24 dB

0001 0111

+23 dB

0000 0001

+1 dB

0000 0000

0 dB

1111 1111

-1 dB

1111 1110

-2 dB

1000 0001

-127 dB

Table 6. Master Integer Volume Settings

RESERVED

MSTR_FVOL1

MSTR_FVOL0

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