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CS4237B Datasheet(PDF) 38 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 38 Page - Cirrus Logic |
38 / 114 page Right DAC (PC Wave) Volume (I7) Default = 10000000 D7 D6 D5 D4 D3 D2 D1 D0 RDOM RDG6 RDG5 RDG4 RDG3 RDG2 RDG1 RDG0 RPM res RPA5 RPA4 RPA3 RPA2 RPA1 RPA0 If both IFM (X4 or Global Config. byte) and WTEN (C8 or Global Config. byte) are cleared, this register is the master digital audio volume for the right chan- nel with the following bit definitions: RDG6-RDG0 Right DAC Master Volume. The least significant bit represents 1.5 dB, with 0000000 = 0 dB. The total range is +12 to -94.5 dB. See Table 12. RDOM Right DAC Master Mute. When set, the right DAC to the output mixer is muted. If IFM or WTEN is set, this register controls the right channel volume for data coming from the ISA bus only (and X15 is the right channel digital audio mas- ter volume) with the following bit descriptions. RPA5-RPA0 Right PC Wave Attenuation. The least significant bit represents -1.5 dB, with 000000 = 0 dB. The total range is 0 to -94.5 dB. See Table 6. res Reserved. Must write 0. Could read as 0 or 1. RPM Right PC Wave Mute. When set, the right PCM input to the digital mixer summer will be muted. Fs and Playback Data Format (I8) Default = 00000000 D7 D6 D5 D4 D3 D2 D1 D0 FMT1 FMT0 C/LS/M CFS2 CFS1 CFS0 C2SL C2SL Clock 2 Source Select: This bit selects the clock base used for the audio sample rates for both capture and playback. Note that this bit can be disabled by setting SRE in I22 or by setting IFSE in X11. CAUTION: C2SL can only be changed while MCE (R0) is set. See Table below. CFS2-CFS0 Clock Frequency Divide Select: These bits select the audio sample fre- quency for both capture and playback. The actual audio sample frequency depends on which clock base (C2SL) is selected. Note that these bits can be disabled by setting SRE in I22 or IFSE in X11. CAUTION: CFS2-CFS0 can only be changed while MCE (R0) is set. DIVIDE C2SL = 0 C2SL = 1 0 - 3072 8.0 kHz 5.51 kHz 1 - 1536 16.0 kHz 11.025 kHz 2 - 896 27.42 kHz 18.9 kHz 3 - 768 32.0 kHz 22.05 kHz 4 - 448 N/A 37.8 kHz 5 - 384 N/A 44.1 kHz 6 - 512 48.0 kHz 33.075 kHz 7 - 2560 9.6 kHz 6.62 kHz S/M Stereo/Mono Select: This bit deter- mines how the audio data streams are formatted. Selecting stereo will result in alternating samples repre- senting left and right audio channels. Mono playback plays the same audio sample on both channels. Mono capture only captures data from the left channel. In MODE 1, this bit is used for both playback and capture. In MODEs 2 and 3, this bit is only used for playback, and the capture format is independently se- lected via I28. MCE (R0) or PMCE (I16) must be set to modify S/M. See Changing Audio Data Formats section for more details. DS213PP4 CS4237B 38 |
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