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CS4237B Datasheet(PDF) 59 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 59 Page - Cirrus Logic |
59 / 114 page Mixer Data Register, SBbase+5 This register provides read/write access to a par- ticular mixer register depending on the index address specified in the Mixer Address Register. Reset SBbase+6, write only When bit D[0] of this register is set to a one and then set to a zero, a reset of the Sound Blaster interface will occur. Read Data Port SBbase+A, read only When bit D[7] of the Data Available Register, SBbase+E, is set =1 then valid data is available in this register. The data may be the result of a Command that was previously written to the Command/Write Data Register or digital audio data. Command/Write Data SBbase+C, write only The Command/Write Data register is used to send Sound Blaster Pro commands. Write Buffer Status, SBbase+C, read only The Write Buffer Status register bit D[7] indi- cates when the SBPro interface is ready to accept another command to the Command/Write Data register. D[7]=1 indicates ready. D[7]=0 in- dicates not ready. Sound Blaster Mixer Registers The Sound Blaster mixer registers are shown in Table 20. The Sound Blaster mixer to WSS Codec mixer mapping is shown in Figure 5. Reset Register, Mixer Index 00H Writing any value to this register will reset the mixer to default values. Voice Volume Register, Mixer Index 04H, Default = 99H This register provides 8 steps of voice volume control each for the right and left channels. Microphone Mixing Register, Mixer Index 0AH, Default = 01H This register provides 4 steps of microphone vol- ume control. Input Control Register, Mixer Index 0CH This register selects the input source to the ADC. D2,D1 - 00 - Microphone 01 - CD Audio 10 - Microphone 11 - Line In Output Control Register, Mixer Index 0EH VSTC - 0 - Mono Mode 1 - Stereo Mode Master Volume Register, Mixer Index 22H, Default = 99H This register provides 8 steps of master volume control each for the right and left channels. FM Volume Register, Mixer Index 26H, Default = 99H This register provides 8 steps of FM volume control each for the right and left channels. CD Volume Register, Mixer Index 28H, Default = 01H This register provides 8 steps of CD volume control each for the right and left channels. Line-In Volume Register, Mixer Index 2EH, Default = 01H This register provides 8 steps of line-in volume control each for the right and left channels. DS213PP4 CS4237B 59 |
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