Cirrus-logic CRD49530-USB Manual do Utilizador descarregar pdf (Página 31)

Changing Audio Input Source

CRD49530-USB User’s Manual

4.3.4 DAI Input

Each available audio source for the board is shown as a block connected to the DAI port of the CS4953xx

as illustrated in Figure 4-7. Right-clicking any of the sources and selecting Device Properties, produces

the DAI Properties dialog.

Figure 4-7. CRD49530 DAI Input Properties

This dialog allows the user to set the following parameters for the CS4953xx:

• SCLK polarity - Rising edge / Falling edge

• LRCLK polarity - Channel 0 low / Channel 0 high

• Channel Mode - SPDIF on pin 4 / SPDIF on pin 0

• Temperature Grade - CRD49530s are populated with commercial-grade chips by default

• Ref Clock - Set to the frequency of the crystal driving the CS49353xx (Y1). This is the reference

clock is used to determine the clock dividers needed to derive Fs in ADC-only applications. If this

number changes, then all dividers for LRCLK/SCLK will change by the same ratio (e.g.

@24.576 MHz MCLK/512 = 1Fs = LRCLK, @12.288 MHz MCLK/256 = 1Fs = LRCLK)

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Cirrus-logic CRD49530-USB Manual do Utilizador Página 31