PCM9211 datasheet(32/121 Pages) TI

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InternalLOCK

LRCKO(I 2S)

MUTE(Low)

ERROR

DOUT

Parityerror

Interpolationprocessingbypreviousdata

InternalLOCK

LRCKO(I 2S)

ERROR

DOUT

Parityerror

[FORPCMSIGNAL]

[FORNON -PCMSIGNAL ]

Ln+1

Rn+1

Ln+1

Rn+2

Rn+3

Ln+3

MUTE(Low)

Ln+1

Rn+1

Ln+2

Rn+2

Rn+3

Ln+3

PCM9211

SBAS495 – JUNE 2010

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DIR: Parity Error Processing

Error detection and processing for parity errors behave in the following manner:

•

For PCM data, when an error is detected (for example, a parity error), then the data from the previous sample

are repeated. This sequence is shown in Figure 26, where sample Ln+1 is repeated because the incoming

data (Ln+2) had an error.

•

For non-PCM data, the data are output as is with no changes. (Non-PCM data implies data which has

Channel Status bit 1 = '1'.)

Figure 26 shows the processing for parity error occurrence.

Figure 26. Processing for Parity Error Occurrence

The PCM9211 handles parity errors as directed by the 23h/PRTPRO[1:0] registers.

When set to '01', if the error is received eight times sequentially, the DIR output is muted on the next error. Until

the mute is enabled, the previously accurate sample is repeated. This function is only valid for PCM data.

When set to '10', the device behaves in exactly the same way as it does when set to '01'. However, this function

is enabled for both PCM and non-PCM data.

When set to '00', the device ignores parity errors and continues to output whatever data comes into the device.

The setting on '11' is reserved.

DIR: Errors and Interrupts

The PCM9211 has two pins that are used to inform the system DSP or controller that there is an error, or an

interrupt that it should be aware of.

The ERR/INT0 and NPCM/INT1 pins can be configured in these ways:

HARDWARE PIN

OPTIONS

ERR/INTO0

DIR Error (default), INT0 or Hi-Z

NPCM/INT1

DIR NPCM (default), INT1 or Hi-Z

When configured as direct DIR error connections (ERR, NPCM), the system audio processor typically treats

them as dedicated interrupt pins to change or control audio processing software. An example would be that the

system may mute if an ERR signal is detected. Another example is that if the DSP receives an NPCM interrupt, it

begins looking for AC-3 or DTS preambles in the incoming encoded S/PDIF stream.

For more advanced users, the two pins can be set up as interrupt sources. The seven interrupt sources

(ERROR, NPCM, DTS-CD/LD, Emphasis, Channel Status Start, Burst Preamble Start, fS Calculator Complete)

can be masked into Registers INT0 and INT1.

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