13 pcm channel mixer (address 18h), P 50, Cs43l21 – Cirrus Logic CS43L21 User Manual
Page 50: Aouta (address 16h) & aoutb (address 17h)
50
DS723F1
CS43L21
AOUTA (Address 16h) & AOUTB (Address 17h)
Note: The DATA_SEL[1:0] bits in reg09h must be set to ‘01’b to enable function control in this register.
AOUTX Volume Control (AOUTX_VOL[7:0])
Default = 00h
Function:
The analog output levels can be adjusted in 0.5 dB increments from +12 to -102 dB as dictated by the DAC
Soft and Zero Cross bits (DACX_SZC[1:0]). Levels are decoded in unsigned binary as described in the table
above.
Note:
When the limiter is enabled, the AOUT Volume is automatically controlled and should not be ad-
justed manually. Alternative volume control may be achieved using the PCMMIXx_VOL[6:0] bits.
6.13
PCM Channel Mixer (Address 18h)
Note: The DATA_SEL[1:0] bits in reg09h must be set to ‘01’b to enable function control in this register.
Channel Mixer (PCMx[1:0] )
Default: 00
Function:
Implements mono mixes of the left and right channels as well as a left/right channel swap.
7
6
5
4
3
2
1
0
AOUTx_VOL7 AOUTx_VOL6 AOUTx_VOL5 AOUTx_VOL4 AOUTx_VOL3 AOUTx_VOL2 AOUTx_VOL1 AOUTx_VOL0
Binary Code
Volume Setting
0001 1000
+12.0 dB
···
···
0000 0000
0 dB
1111 1111
-0.5 dB
1111 1110
-1.0 dB
···
···
0011 0100
-102 dB
···
···
0001 1001
-102 dB
7
6
5
4
3
2
1
0
PCMA1
PCMA0
PCMB1
PCMB0
Reserved
Reserved
Reserved
Reserved
PCMA[1:0] AOUTA
PCMB[1:0]
AOUTB
00
L
00
R
01
01
10
10
11
R
11
L
L
R
+
2
------------
L
R
+
2
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