sta381bw STMicroelectronics, sta381bw Datasheet - Page 126

• Manufacturer Part Number: sta381bw
• Description: Sound Terminal 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

Register description: Sound Terminal compatibility
7.9.2
7.9.3
7.9.4
7.9.5
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EQ bypass
EQ control can be bypassed on a per-channel basis for channels 1 and 2. If EQ control is
bypassed on a given channel, the prescale and all filters (biquads, bass, treble in any
combination) are bypassed for that channel.
Table 140. EQ bypass
Volume bypass
Each channel contains an individual channel volume bypass. If a particular channel has
volume bypassed via the CxVBP = 1 register, then only the channel volume setting for that
particular channel affects the volume setting, the master volume setting will not affect that
channel.
Table 141. Volume bypass register
Binary output enable registers
Each individual channel output can be set to output a binary PWM stream. In this mode
output A of a channel is considered the positive output and output B is the negative inverse.
Table 142. Binary output enable registers
Limiter select
Limiter selection can be made on a per-channel basis according to the channel limiter select
bits. CxLS bits are not considered in case of dual-band DRC (6.11.1), EQ DRC (6.26.1)
usage.
.
Table 143. Channel limiter mapping as a function of CxLS bits
CxLS[1:0]
CxEQBP
CxVBP
CxBO
00
01
10
0
1
0
1
0
1
Channel has limiting disabled
Channel is mapped to limiter #1
Channel is mapped to limiter #2
Perform EQ on channel x - normal operation
Bypass EQ on channel x
Normal volume operations
Volume is bypassed
FFX 3-state output - normal operation
Binary output
Doc ID 018835 Rev 2
Channel limiter mapping
Mode
Mode
Mode
STA381BW