Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 593

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from the encoded stream is also available if the system requires it.

2. Initialize the

this peripheral is enabled by default.

Interrupted Data Streams on the Receiver

When using the S/PDIF receiver with data streams that are likely to be

interrupted, (in other words unplugged and reconnected), it is necessary

to take some extra steps to ensure that the S/PDIF receiver's digital PLL

will re lock to the stream. The steps to accomplish this are described

1. Set up interrupts within the DAI so that the S/PDIF receiver can

generate an interrupt when the stream is reconnected.

2. Within the interrupt service routine (ISR), stop and restart the dig-

ital PLL. This is accomplished by setting and then clearing bit 7 of

the S/PDIF receiver control register.

3. Return from the ISR and continue normal operation.

This method of resetting the digital PLL has been shown to provide

extremely reliable performance when S/PDIF inputs that are interrupted

or unplugged momentarily occur.

The following procedure and the example code show how to reset the dig-

ital PLL. Note that all of the S/PDIF receiver interrupts are handled

through the DAI interrupt controller.

1. Initialize the No Stream Interrupt

/* Enable interrupts (globally) */

BIT SET MODE1 IRPTEN;

/* unmask DAI Hi=Priority Interrupt */

ADSP-214xx SHARC Processor Hardware Reference

www.BDTIC.com/ADI

), the serial frame sync (

). The high frequency clock (

Sony/Philips Digital Interface

), and the serial data

DIR_TDMCLK_O

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