Realtek Ameba-D RTL872 D Series User Manual page 350

17.6.2.17 0x1E
Address Bit Name
0x1E [0] ALC_CTR_EN
[1] ALC_DRC_EN
[3:2] ALC_DRC_RATIO_SEL
[5:4] ALC_DRC_RATIO_SEL2
[6] ALC_EN
[7] ALC_FORCE_FAST_RC_CTR
[8] ALC_FORCE_FAST_RC_EN
[14:9] ALC_FT_BOOST
[15] RSVD
17.6.2.18 0x1F
Address Bit Name
0x1F [2:0] ALC_LPF_COEF_SEL
[5:3] ALC_MIN_RANGE
User Manual
Access Reset Description
R/W 1'b0 ALC function & volume control
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1'b0: Function OFF but volume ON
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1'b1: Function ON and volume ON
R/W 1'b0 DRC enable control
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1'b0: DISABLE DRC
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1'b1: enable DRC
R/W 2'b01 ALC DRC compression ratio select control
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2'b00: 1:1
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2'b01: 1:2
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2'b10: 1:4
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2'b11: 1:8
R/W 2'b01 ALC DRC compression ratio select control
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2'b00: 1:1
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2'b01: 1:2
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2'b10: 1:4
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2'b11: 1:8
R/W 1'b0 ALC enable control
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1'b0: Disable ALC
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1'b1: Enable ALC
R/W 1'b0 ALC force fast recovery control
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1'b0: Disable force fast recovery
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1'b1: Enable force fast recovery
R/W 1'b1 ALC force fast recovery control for special cases (zero data mode)
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1'b0: Disable force fast recovery for zero data mode
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1'b1: Enable force fast recovery for zero data mode
R/W 6'h0 ALC front boost gain control (0.75dB/step)
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6'h00: 0dB
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6'h01: 0.75dB
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...
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6'h27: 29.25dB
N/A 1'b0 Reserved
Access Reset Description
R/W 3'h3 Coefficient for low pass filter in ALC
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R/W 3'h2 Threshold margin control in ALC
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All information provided in this document is subject to legal disclaimers.
350
3'b000: 2^-3
3'b001: 2^-4
3'b010: 2^-5
3'b011: 2^-6
3'b100: 2^-7
3'b101: 2^-8
3'b110: 2^-10
3'b111: 2^-11
3'b000: +-0dB
3'b001: +-0.375dB
3'b010: +-0.75dB
3'b011: +-1.125dB
3'b100: +-1.5dB
3'b101: +-1.875dB
3'b110: +-2.25dB
3'b111: +-2.625dB
Ameba-D User Manual
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