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CS47L35 Datasheet(PDF) 72 Page - Cirrus Logic |
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CS47L35 Datasheet(HTML) 72 Page - Cirrus Logic |
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72 / 300 page  72 DS1085F3 CS47L35 4.3 Digital Core The input signal paths may be selected as input to the digital mixers or signal-processing functions. The sample rate for the input signal paths is configured using the IN_RATE field. The output signal paths are derived from the respective output mixers. The sample rate for the output signal paths is configured using OUT_RATE. The sample rate of the AEC loop-back path is also set by OUT_RATE. The AIFn RX inputs may be selected as input to the digital mixers or signal-processing functions. The AIFn TX outputs are derived from the respective output mixers. The sample rates for digital audio interfaces (AIF1–AIF3) are configured using the AIFn_RATE fields (where n identifies the applicable AIF 1, 2, or 3) respectively. The SLIMbus interface supports up to six input channels and six output channels. The sample rate of each channel can be configured independently, using SLIMTXn_RATE and SLIMRXn_RATE. The EQ, DRC, and LHPF functions can be enabled in any signal path within the digital core. The sample rate for these functions is configured using FX_RATE. Note that the EQ, DRC, and LHPF functions must all be configured for the same sample rate. The DSPn functions can be enabled in any signal path within the digital core. The applicable sample rates are configured using the DSPn_RATE fields (where n identifies the applicable DSP block, 1 to 3) respectively. The S/PDIF transmitter can be enabled on a GPIO pin. Stereo inputs to this function can be configured from any of the digital-core inputs, mixers, or signal-processing functions. The sample rate of the S/PDIF transmitter is configured using SPD1_RATE. The tone generators and noise generator can be selected as input to any of the digital mixers or signal-processing functions. The sample rates for these sources are configured using the TONE_RATE and NOISE_GEN_RATE fields, respectively. The haptic signal generator can be used to control an external vibe actuator, which can be driven directly by the Class D speaker output or The sample rate for the haptic signal generator is configured using HAP_RATE. The PWM signal generators can be modulated by an audio source, derived from the associated signal mixers. The sample rate (cycle time) for the PWM signal generators is configured using PWM_RATE. The sample-rate control registers are described in Table 4-21. Refer to the field descriptions for details of the valid selections in each case. The control registers associated with the ISRCs are described in Table 4-22. Note that 32-bit register addressing is used from R12888 (0x3000) upwards; 16-bit format is used otherwise. The registers noted in Table 4-21 contain a mixture of 16-bit and 32-bit register addresses. Table 4-21. Digital-Core Sample-Rate Control Register Address Bit Label Default Description R32 (0x0020) Tone_Generator_1 14:11 TONE_RATE[3:0] 0000 Tone Generator Sample Rate 0000 = SAMPLE_RATE_1 0001 = SAMPLE_RATE_2 0010 = SAMPLE_RATE_3 All other codes are reserved. The selected sample rate is valid in the range 8–192 kHz. R48 (0x0030) PWM_Drive_1 14:11 PWM_RATE[3:0] 0000 PWM Frequency (sample rate) 0000 = SAMPLE_RATE_1 0001 = SAMPLE_RATE_2 0010 = SAMPLE_RATE_3 All other codes are reserved. The selected sample rate is valid in the range 8–192 kHz. All PWMnMIX_SRCm fields must be cleared before changing PWM_RATE. R144 (0x0090) Haptics_Control_1 14:11 HAP_RATE[3:0] 0000 Haptic Signal Generator Sample Rate 0000 = SAMPLE_RATE_1 0001 = SAMPLE_RATE_2 0010 = SAMPLE_RATE_3 All other codes are reserved. The selected sample rate is valid in the range 8–192 kHz. |
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