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CS4237B Datasheet(PDF) 90 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 90 Page - Cirrus Logic |
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90 / 114 page  If VCEN is zero, then if ACDbase is ever pro- grammed to a non-zero value, this pin converts to the ACDCS pin and keeps this function until the part is reset (or VCEN is set to one). If ACDbase is never programmed non-zero, then the state of XIOW at the time RESDRV is brought low determines whether the pin is XCTL1 or SINT. If XIOW is sampled low (ex- ternal pu lldown) then XCTL1/SINT/ ACDCS/DOWN functions as an input for the synthesizer interrupt. If XIOW is sampled high (pin left unconnected) then XCTL1/SINT/ ACDCS/DOWN becomes an output for XCTL1. This part contains another multiplexed pin, SCS/UP. This pin provides the FM synthesizer chip select or the hardware volume control "vol- u me up " fe at u re . Si nc e a n i nte rnal FM synthesizer exists, this pin would normally be used for the volume control feature. Setting VCEN forces this pin to the UP volume control function. When VCEN is clear, this pin is the SCS chip select function. ANALOG HARDWARE DESCRIPTION The analog hardware consist of an MPC Level 2-compatible mixer (four stereo mix sources), three line-level stereo inputs, a stereo microphone input, a mono input, a mono output, and a stereo line output. This section describes the analog hardware needed to interface with these pins. Line-Level Inputs Plus MPC Mixer The analog inputs consist of four stereo analog inputs, and one mono input. As shown in Fig- ure 4, the input to the ADCs comes from the Input Mixer that selects any combination of the following: LINE, AUX1, AUX2, MIC, the DAC output, and the output from the analog output mixer. Unused analog inputs should be con- nected together and then connected through a capacitor to analog ground. The analog input interface is designed to accom- modate four stereo inputs and one mono input. Four of these sources are mixed to the ADC. These inputs are: a stereo line-level input (LINE), a stereo microphone input (MIC), a ste- reo CD-ROM input (AUX2), and a stereo auxiliary line-level input (AUX1). The LINE and AUX1 inputs have two paths to the Input Mixer. One path is direct with no volume con- trol. The other path goes through an inverting amplifier, which enables volume control. Care should be taken to select only one of these dual paths, because the inverting path will cancel the signal of the non-inverting path at the Input Mixer. The LINE, MIC, AUX1, and AUX2 in- puts have paths after their volume controls, to the output mixer. The output mixer has the addi- tional input of a mono input channel. All audio inputs should be capacitively coupled. To obtain Sound Blaster mixer compatibility, the mapping of external devices to analog inputs is important. An external FM or Wavetable synthe- sizer analog output must be connected to the LINE input. The internal FM’s volume control, when enabled, maps to the LINE analog mixer registers. The CDROM analog outputs must be connected to the AUX2 inputs, and the external Line Inputs must be connected to the AUX1 ana- log inputs. Since some analog inputs can be as large as 2 VRMS, the circuit shown in Figure 26 can be used to attenuate the analog input to 1 VRMS which is the maximum voltage allowed for the line-level inputs. 6.8 k Ω 6.8 k Ω 1.0 µF 1.0 µF R L 6.8 k Ω 6.8 k Ω Figure 26. Line Inputs DS213PP4 CS4237B 90 |
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