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CS4391A Datasheet(PDF) 19 Page - Cirrus Logic |
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CS4391A Datasheet(HTML) 19 Page - Cirrus Logic |
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19 / 40 page  CS4391A DS600PP3 19 4.2 VOLUME AND MIXING CONTROL (ADDRESS 02H) 4.2.1 Channel A Volume = Channel B Volume (Bit 7) Function: The AOUTA and AOUTB volume levels are independently controlled by the A and the B Channel Vol- ume Control Bytes when this function is disabled. The volume on both AOUTA and AOUTB are de- termined by the A Channel Volume Control Byte and the B Channel Byte is ignored when this function is enabled. 4.2.2 Soft Ramp or Zero Cross Enable (Bits 6:5) Function: Soft Ramp Enable Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1dB per 8 left/right clock periods. Zero Cross Enable Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon- itored and implemented for each channel. Soft Ramp and Zero Cross Enable Soft Ramp and Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level change will occur after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently monitored and implemented for each channel. See Table 5 4.2.3 ATAPI Channel Mixing and Muting (Bits 4:0) Function: The CS4391A implements the channel mixing functions of the ATAPI CD-ROM specification. See Table 6 4.3 CHANNEL A VOLUME CONTROL - ADDRESS 03H See Section 4.4 Channel B Volume Control - Address 04h 76543 210 A = B Soft Zero Cross ATAPI4 ATAPI3 ATAPI2 ATAPI1 ATAPI0 |
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