STA310 datasheet(30/90 Pages) STMICROELECTRONICS

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STA310

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ter). In this case, the latency is specified in the IEC958_LATENCY register.

Note that there are minimum and maximum values to respect

Table 7.

If those limits are not respected, an error interrupt occurs corresponding to error type: LATENCY_TOO_BIG,

which automatically makes the chip switch to auto_latency mode.

For software versions prior to 6, the latency is not implemented.

6.3 PCM null data

When configured in muted mode (in the IEC958_CMD register), the outputs are PCM null data. This can be

used to synchronize the external IEC receiver.

INTERRUPTS

7.1 Interrupt register

The decoder can signal to the external controller that an interrupt has occurred during the execution.

The register INTE enables to select which interrupts will be generated and output on the IRQ output pin.

When an interrupt occurs, the signal IRQ is activated low and the controller can check which interrupt was de-

tected by reading the register INT.

According to the type of interrupt detected, other information can be obtained by reading associated registers

(such as stream header, type of error detected, PTS value).

7.2 IRQ Signal

This signal, IRQ, is a three-state line. This signal indicates (by going low) when an interrupt occurs. It returns to

high level once the corresponding bit in the interrupt register has been cleared.

7.3 Error concealment

Errors are signaled as interrupts by the audio core. The error list is provided in. Most of the errors are automat-

ically handled by the core, some require that software be changed.

AC-3 decoding errors:

Those errors are signaled in the ERROR register but handled directly by the core. Nothing can be done by the

software. They signal that something wrong happened during the decoding. The core soft mutes the frame and

continues to decode.

MPEG decoding errors:

Those errors are also signaled in the ERROR register but handled directly by the core. Nothing can be done by

the software. They signal that something wrong happened during the decoding. The core soft mutes the frame

and continues to decode. Only one error in this category indicates a programming error: if triggering the

AC-3

MPEG

Min. Latency

Max. Latency

Min. Latency

Max. Latency

256

samples / Fs

1536

samples / Fs

1152

samples / Fs

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