Sony Ericsson GR 47 Technical Description page 26

GR47/GR48 Technical description
In the case where no external audio processing is performed, then it is
necessary to connect the following signals at the system connector:
PCMDLD and PCMI
PCMULD and PCMO
Electrical characteristics
The Dig. 2.75 V CMOS Output / Input electrical characteristics shall
apply, with DGND as the reference.
PCM interface format
The PCM format (for PCMULD and PCMDLD) shall follow a linear
PCM data I/O format of an industry standard Texas Instrument DSP.
It is the same format as the one used between the CODEC and the
DSP. The DSP is the source of the bit clock PCMCLK and the frame
synchronisation PCMSYNC. The data bits in PCMULD and
PCMDLD shall be aligned so that the MSB in each word occurs on
the same clock edge.
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GBBA/SEM/BMS 03:0001 Rev