Cirrus Logic CS4391 - Manual (Page 21)

CS4391
DS335PP4 21
5. PIN DESCRIPTION - PCM DATA MODE
Reset - RST
Pin 1, Input
Function:
Hardware Mode: The device enters a low power mode and the internal state machine is reset to the de-
fault setting when low. When high, the device becomes operational.
Control Port Mode: The device enters a low power mode and all internal registers are reset to the default
settings, including the control port, when low. When high, the control port becomes operational and the
PDN bit must be cleared before normal operation will occur. The control port can not be accessed when
reset is low. The Control Port Enable Bit must also be enabled after a device reset.
RST is required to remain low until the power supplies and clocks are applied and stable.
Interface Power - VL
Pin 2, Input
Function:
Digital interface power supply. Typically 1.8 to 5.0 VDC. The voltage on this pin determines the logic level
high threshold for the digital inputs. The voltage on VL is the maximum allowable input level for all digital
inputs.
Serial Audio Data - SDATA
Pin 3, Input
Function:
Two's complement MSB-first serial data is input on this pin. The data is clocked into SDATA via the serial
clock and the channel is determined by the Left/Right clock. The required relationship between the
Left/Right clock, serial clock and serial data is defined by the Mode Control Byte in Control Port Mode or
the Mode Pins in Hardware Mode. The options are detailed in Figures 7-24.
Reset RST AMUTEC Channel A Mute Control
Logic Voltage VL AOUTA- Differential Output
Serial Data SDATA AOUTA+ Differential Output
Serial Clock SCLK VA Analog Power
Left/Right Clock LRCK AGND Analog Ground
Master Clock MCLK AOUTB+ Differential Output
See Description M3 AOUTB- Differential Output
See Description (SCL/CCLK) M2 BMUTEC Channel B Mute Control
See Description (SDA/CDIN) M1 CMOUT Common Mode Voltage
See Description (AD0/CS) M0 FILT+ Positive Voltage Reference
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