SimCom SIM5218E Hardware Design page 38

SIM5218E Hardware Design
PCM_DIN/GPIO0
PCM_DOUT/GPIO5
PCM Interface can be operated in Master and Slave mode. When the PCM interface is configured,
PCM Tx data will be routed from the external codec mic through the DSP encode path in the
Module. PCM Rx data will be routed through the DSP decode path to the external codec
speaker. When using the PCM Interface, the Module can be set either into Master Mode or Slave
Mode.
In Master Mode, the Module drives the clock and sync signals that are sent out to the external
codec via the PCM Interface. When in Slave Mode, the external codec drives the clock and sync
signals that are sent to the Module.
Configuration Mode can be selected either primary or auxiliary. Primary configuration mode uses
2.048MHz clock and 8kHz short sync clock, and auxiliary configuration mode uses 2.048MHz
clock and 8kHz long sync clock. One important consideration is that Slave mode is only available
for use with Primary configuration Mode.
In the default configuration, Module is the Auxiliary Master.
Many parameters of external codec audio channel are not available. Only RxVolume, FIR, are still
available after enabling PCM.
Table 16 : PCM external codec Characteristics
Audio Device no.
AT+CSDVC=
Name
Default
MIC path
Parameters
Default
Output
path
Parameters rxFilter
Default values of
sound level
(level 1 to 4)
NOTE: Please check the reference document [1] for detailed information of each AT
command. More information on PCM interface in section 3.19.
SIM5218E_HD_V1.03
65 PCM data input to the Module (Tx)
33 PCM data output from the Module (Rx)
4
External Codec
micAmp No available
txGain No available
txVol No available
txFilter 0xff33, 0x05d8,0xf488, 0x0af3,
[tap0~6] 0x24bb, 0xca42,0x7c95
rxGain No available
rxVol -100
stGain No available
0xff00, 0xfac9,0x0571, 0xf365,
[tap0~6] 0x0bc2, 0xf2bb,0x533a
0
0
0
0
37
11.06.2009