Table 8. channel integer volume settings – Cirrus Logic CS44800 User Manual
Page 59
DS632F1
59
CS44800
7.10
Channel XX Volume Control - Integer (addresses 09h - 10h)
7.10.1
Channel Volume Control - Integer (CHXx_IVOL[7:0])
Default = 00000000
Function:
The Channel X 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.
7.11
Channel XX Volume Control1 - Fraction (address 11h)
7.12
Channel XX Volume Control2 - Fraction (address 12h)
7.12.1
Channel Volume Control - Fraction (CHXX_FVOL[1:0])
Default = 00
00 - +0.00 dB
01 - +0.25 dB
10 - +0.50 dB
11 - +0.75 dB
Function:
The Channel X Volume Control - Fraction register is an additional offset to the value in the Channel Vol-
ume Control - Integer register and allows global control of the signal levels on all channels in 0.25 dB in-
crements. 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.
See
“Master Volume Control - Fraction (address 08h)” on page 57
for hints on converting decimal num-
bers to 2’s complement binary values.
7
6
5
4
3
2
1
0
CHXX_IVOL7
CHXX_IVOL6
CHXX_IVOL5
CHXX_IVOL4
CHXX_IVOL3
CHXX_IVOL2
CHXX_IVOL1
CHXX_IVOL0
CHXX_IVOL[7:0]
Hex Value
Volume Setting
0001 1000
18
+24 dB
0001 0111
17
+23 dB
0000 0001
01
+1 dB
0000 0000
00
0 dB
1111 1111
FF
-1 dB
1111 1110
FE
-2 dB
1000 0001
81
-127 dB
Table 8. Channel Integer Volume Settings
7
6
5
4
3
2
1
0
CHB2_FVOL1
CHB2_FVOL0
CHA2_FVOL1
CHA2_FVOL0
CHB1_FVOL1
CHB1_FVOL0
CHA1_FVOL1
CHA1_FVOL0
7
6
5
4
3
2
1
0
CHB4_FVOL1
CHB4_FVOL0
CHA4_FVOL1
CHA4_FVOL0
CHB3_FVOL1
CHB3_FVOL0
CHA3_FVOL1
CHA3_FVOL0