Cirrus-logic CDB470xx Manual de usuario descargar pdf (Pagina 15)

CDB47xxx Main Board System Description

CDB47xxx User’s Manual

selection header. Pin 1 of each header is marked with a triangle and the word “REG”. Pin 2 of each

header is labeled with the voltage required for that pin (+5V, +3.3V, or +1.8V).

1.3.7 Digital Audio Input Source Multiplexer (U1)

The audio input source multiplexer has the following characteristics:

• Source 1: Optical S/PDIF Input

• Source 2: Coaxial S/PDIF Input

• Source 3: Digital Audio Input (DAI) Header

This multiplexer is used to select which audio source feeds the CS470xx DAI3 pin. When the CS470xx

has DAI3 configured as a S/PDIF receiver, either Source 1 or Source 2 can be selected by the MCU.

When DAI3 is configured as a standard I2S input, Source 3 can be selected as the data source.

The CDB47xxx has been designed to indicate which input is currently selected by illuminating a specific

LED for each Source, as described below:

• Source 1 selected: D12 will be on

• Source 2 selected: D51 will be on

• Source 3 selected: D5 will be on

1.3.8 CS470xx Audio System-On-a-Chip (ASOC)

The CS470xx ASOCs are a family of ICs designed specifically for audio applications. The CDB47xxx

allows a designer to evaluate the CS470xx ASOCs in many different modes of multi-channel input and

output. The 100-pin footprint on the daughtercard is compatible with any CS470xx chip that uses the

LQFP100 package.

Audio input data to the ASOC can come from any of the following sources:

• Line-Level Analog Audio Input Connectors

• Optical S/PDIF Input Connector

• Coaxial S/PDIF Input Connector

• DAI Header

Audio output data from the ASOC can be sent to the following destinations:

• Line-Level Analog Audio Output Connectors

• Optical S/PDIF Output Connector

• Coaxial S/PDIF Input Connector

• DAO Header

The CS470xx can be booted from external serial Flash for custom applications in which a host MCU is not

desired.

The CDB47xxx also allows the PC to act as a host to boot and configure the DSP through the GUI

software for real-time configuration of the audio processing.

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