User Manual

GM47/48 Technical description
BA/SEM/MS 02:0004 Rev B
24
In case no external audio processing is performed, then it is needed to
connect
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.
3.10 Serial Data
Pin Name Dir Description RS232 CCITT
Nº
41 TD I Serial data to module 103
42 RD O Serial data from module 104
39 RTS I Request To Send 105
40 CTS O Clear To Send 106
37 DTR I Data Terminal Ready 108.2
38 DCD O Data Carrier Detect 109
36 RI O Ring Indicator 125
45 TD2 I UART 2 Data Transmission
46 RD2 O UART 2 Data Reception
43 TD3 O UART 3 Data Transmission
44 RD3 I UART 3 Data Reception