CS4237B Datasheet, PDF (99/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

CS4237B
DACK<A,B,C> - DMA Acknowledge, Inputs
The assertion of these active low signals indicate that the current DMA request is being
acknowledged and the part will respond by either latching the data present on the data bus
(write) or putting data on the bus (read). The DACK<A,B,C> inputs must be connected to 8-bit
DMA channel acknowledge lines only. The defaults on the ISA bus are DACKA = DACK0,
DACKB = DACK1, and DACKC = DACK3. The defaults can be changed by modifying the
Hardware Resource data.
IRQ <A:F>- Host Interrupt Pins, Outputs, 24mA drive
These signals are used to notify the host of events which need servicing. They are connected to
specific interrupt lines on the ISA bus. The IRQ<A:F> are individually enabled as per
configuration data that is generated during a Plug and Play configuration sequence. The defaults
on the ISA bus are IRQA = INT5, IRQB = INT7, IRQC = INT9, IRQD = INT11,
IRQE = INT12, IRQF = INT15. The defaults can be changed by modifying the Hardware
Configuration data loaded from the E²PROM.
Analog Inputs
LLINE - Left Line Input
Nominally 1 V_RMS max analog input for the Left LINE channel, centered around VREF. A
programmable gain block provides volume control and is located in either I18 or X0 based on
how synthesis is mapped. LLINE is typically used for Left Channel Synthesis (FM or
Wavetable).
RLINE - Right Line Input
Nominally 1 V_RMS max analog input for the Right LINE channel, centered around VREF. A
programmable gain block provides volume control and is located in either I19 or X1 based on
how synthesis is mapped. RLINE is typically used for Right Channel Synthesis (FM or
Wavetable).
LMIC - Left Mic Input
Microphone input for the Left MIC channel, centered around VREF. A programmable gain
block provides volume control and is located in X2. In MODE 3, the output mixer has an extra
selectable 20 dB of gain controlled by the LMBST bit.
RMIC - Right Mic Input
Microphone input for the Right MIC channel, centered around VREF. A programmable gain
block provides volume control and is located in X3. In MODE 3, the output mixer has an extra
selectable 20 dB of gain controlled by the RMBST bit.
LAUX1 - Left Auxiliary #1 Input
Nominally 1 V_RMS max analog input for the Left AUX1 channel, centered around VREF. A
programmable gain block provides volume control and is located in I2. Typically used for an
external Left line-level input.
DS213PP4
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