PCM9211 datasheet(39/121 Pages) TI

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SCK/BCK/LRCK/DOUT

DIR

AUTOselector

OSC

ADC

REG.42

h /ADCLK

REG.26h/AERROR

SCK/BCK/LRCK

Divider

ERRORdefinedbyREG.25h

REG.42h/ADCKOUT

SCK/BCK/LRCK

REG.40h/ADDIS

SCK/BCK/LRCK

AUTOselectsignaldefinedby

REG.25hexcluding AERROR.

REG.26h/ACKSL

REG.6Bh/

MOSSRC&MOPSRC

MainPort

AUXINx

PCM9211

www.ti.com

SBAS495 – JUNE 2010

Figure 31 shows the Clock Tree Diagram for the AUTO source selector.

Figure 31. Clock Tree Diagram for AUTO Source Selector

Non-PCM Data Detection

The PCM9211 can also detect Non-PCM data (AC-3, DTS-CD, etc.) using one of these two methods:

1. Channel Status Bit 1 is '1'.

If Register 28h/CSBIT is set to '1', this function is enabled. Register 39h/SCSBIT1 always indicates Channel

Status Bit 1 status even if CSBIT1 is disabled.

2. A Burst Preamble (PA/PB) is found in the S/PDIF stream.

If Register 28h/PAPB or Register 28h/DTSCD is set to '1', this function is enabled. If DTS-CD detection is

active, it uses DTSCD, and can also be set in Register 29h/DTS16, 29h/DTS14, and Register

29h/DTSPRD[1:0].

If the PCM9211 detects a Burst Preamble when Non-PCM detection is enabled, an error signal and BPSYNC

signal are generated. The BPSYNC signal can be monitored through MPIO_A/MPIO_B/MPIO_C. For more

details, see the MPIO section of this document. The error signal can be monitored from either the ERR_INT0 pin

or the NPCM_INT1 pin.

PC/PD Monitor

The PCM9211 has a PC and PD buffer for monitoring the latest PC or PD. Registers 3Ah and 3Bh are assigned for

the PC buffer; Registers 3Ch and 3Dh are assigned for the PDbuffer.

The following sequence is an example of reading PC/PD buffers. This example is based on using the INT0

function.

1. Set Register 2Ah/MPCRNW0 to '0'.

2. Check that Register 2Ch/OPCRNW0 is '1'.

3. Read the PC and PD buffers.

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