STA304 STMicroelectronics, STA304 Datasheet - Page 21

• Manufacturer Part Number: STA304
• Description: Audio DSPs Digital Audio Proc
• Manufacturer: STMicroelectronics

Specifications of STA304

• Mounting Style: SMD/SMT
• Package / Case: TQFP-44
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STA304
13.0 REGISTER SUMMARY
13.1 Reset Register (add. 00h)
Writing any value to this register performs a register reset, which causes all registers to revert to their default
values. Reading this register returns 00E4h as it is the ID code of the part and its 3D Stereo Enhancement type
(See AC'97 revision 2.1 specification, section 6.3.1).
13.2 LR Volume Register (add. 02h)
This register manage the stereo (both right and left channels) output signal volumes. The MSB of the register
is the mute bit. When this bit is set to 1 the level for that channel is set at -∞ dB. ML6 through ML0 is for the left
channel level, MR6 through MR0 is for the right channel.
There are two options: in 'Full Compliance' operating mode (bit 0 in the CRA register, address 5Ah, is set to '0')
only 6 bits are active (Mx0 to Mx5) and each step corresponds to 1.5 dB. In 'Proprietary' mode (bit 0 in the CRA
register is set to '1') Mx0 to Mx6 can have the values between 0h to 68h (110 1000) and each step corresponds
to 1dB. Greater values are undefined.
The default value is 8000h (1000 0000 0000 0000), which corresponds to 0 dB attenuation with mute on.
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Mute
D15
D15
0
Mute
Mute
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
D14
ML6
D14
0
ML5
D13
D13
0
ML4
D12
D12
0
'Proprietary' Mode
'Full Compliance' Mode
ML3
D11
D11
0
Mx6…Mx0
Mx6…Mx0
x00 0000
x01 1111
x11 1111
000 0000
001 1111
011 1111
110 0001
110 0010
110 0011
110 0100
110 0101
110 0110
110 0111
110 1000
xxx xxxx
xxx xxxx
ML2
D10
D10
…
0
ML1
D9
D9
0
ML0
D8
D8
0
D7
X
D7
1
MR6
D6
D6
1
MR5
D5
D5
1
MR4
D4
D4
46.5dB Attenuation
94.5dB Attenuation
100dB Attenuation
102dB Attenuation
104dB Attenuation
107dB Attenuation
111dB Attenuation
0
31dB Attenuation
63dB Attenuation
99dB Attenuation
∞ dB Attenuation
97dB Attenuation
∞ dB Attenuation
∞ dB Attenuation
0 dB Attenuation
0 dB Attenuation
MR3
D3
Function
Function
D3
0
...
MR2
D2
D2
1
MR1
D1
D1
0
MR0
D0
D0
0