PCM9211
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SBAS495 –JUNE 2010
Figure 31 shows the Clock Tree Diagram for the AUTO source selector.
AUTO select signal defined by
REG.25h excluding AERROR.
ERROR defined by REG.25h
DIR
REG.26h/AERROR
SCK/BCK/LRCK/DOUT
SCK/BCK/LRCK
REG.40h/ADDIS
AUTO selector
Main Port
REG.42h/ADCKOUT
AUXINx
ADC
REG.26h/ACKSL
REG.6Bh/
MOSSRC&MOPSRC
SCK/BCK/LRCK
AUXINx
REG.42 h /ADCLK
SCK/BCK/LRCK
OSC
Divider
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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