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WM8994ECS/R 数据表(PDF) 100 Page - Cirrus Logic |
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WM8994ECS/R 数据表(HTML) 100 Page - Cirrus Logic |
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100 / 363 page  WM8994 100 Rev 4.6 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1058 (0422h) AIF1 DAC2 Filters (1) 9 AIF1DAC2_ MUTE 1 AIF1DAC2 input path (AIF1, Timeslot 1) Soft Mute Control 0 = Un-mute 1 = Mute 5 AIF1DAC2_ MUTERAT E 0 AIF1DAC2 input path (AIF1, Timeslot 1) Soft Mute Ramp Rate 0 = Fast ramp (fs/2, maximum ramp time is 10.7ms at fs=48k) 1 = Slow ramp (fs/32, maximum ramp time is 171ms at fs=48k) (Note: ramp rate scales with sample rate.) 4 AIF1DAC2_ UNMUTE_ RAMP 0 AIF1DAC2 input path (AIF1, Timeslot 1) Unmute Ramp select 0 = Disabling soft-mute (AIF1DAC2_MUTE=0) will cause the volume to change immediately to AIF1DAC2L_VOL and AIF1DAC2R_VOL settings 1 = Disabling soft-mute (AIF1DAC2_MUTE=0) will cause the DAC volume to ramp up gradually to the AIF1DAC2L_VOL and AIF1DAC2R_VOL settings Table 40 AIF1 Input Path Soft Mute Control AIF1 - INPUT PATH MONO MIX AND DE-EMPHASIS FILTER A digital mono mix can be selected on one or both pairs of AIF1 input channels. The mono mix is generated as the sum of the Left and Right AIF channel data. When the mono mix function is enabled, the combined mono signal is applied to the Left channel and the Right channel of the respective AIF1 signal processing and digital mixing paths. To prevent clipping, 6dB attenuation is applied to the mono mix. Digital de-emphasis can be applied to the AIF1 input (playback) paths; this is appropriate when the data source is a CD where pre-emphasis is used in the recording. De-emphasis filtering is available for sample rates of 48kHz, 44.1kHz and 32kHz. See “Digital Filter Characteristics “section for details of de-emphasis filter characteristics. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1056 (0420h) AIF1 DAC1 Filters (1) 7 AIF1DAC1_ MONO 0 AIF1DAC1 input path (AIF1, Timeslot 0) Mono Mix Control 0 = Disabled 1 = Enabled 2:1 AIF1DAC1_ DEEMP [1:0] 00 AIF1DAC1 input path (AIF1, Timeslot 0) De- Emphasis Control 00 = No de-emphasis 01 = 32kHz sample rate 10 = 44.1kHz sample rate 11 = 48kHz sample rate |
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