Pcm Interface; Pcm Multiplex Function - SimCom SIM808 Hardware Design

4.11 PCM Interface

SIM808 provides PCM interface.
Table 20: PCM pin definition
Pin name Pin number
PCM_OUT 48
PCM_IN 47
PCM_SYNC 45
PCM_CLK 46
SIM808 PCM interface only supports master mode, data length is 16 bits (linear), and PCM clock rate is 256
KHz.
Table 21: PCM pin specification
Feature
Line Interface Format
Data length
PCM Clock/Sync Source
PCM Clock Rate
PCM Sync Format
Zero Padding/Sign extensi
on
Data Ordering
Note: User can use AT command control PCM interface, for details please refer to document [1].

4.11.1 PCM Multiplex Function

With GPIO5 and GPIO6, PCM interface can be configured as SPI or SD interface, the following table shows the
detailed multiplex function.
Table 22: PCM Multiplex Function
Name Pin number Mode 0(default)
PCM_OUT 48
PCM_IN 47
PCM_SYNC 45
PCM_CLK 46
GPIO6 44
GPIO5 43
Note: Multiplex Function need different software version.
SIM808_Hardware Design_V1.00
Description
PCM data output
PCM data input
PCM synchrony
PCM clock
specification
Linear(Fixed)
16bits(Fixed)
Master Mode(Fixed)
256Khz(Fixed)
Short sync/Long sync both support
Default Zero Padding
MSB/LSB both support
PCM_OUT
PCM_IN
PCM_SYNC
PCM_CLK
GPIO6
GPIO5
Mode 1 Mode 2
GPIO10 MC3DA3
DISP_DATA MC3DA2
DISP_CS MC3CK
GPIO8 MC3CM0
DISP_CLK MC3DA1
DISP_D/C MC3DA0
43
Smart Machine Smart Decision
Mode 3
/
GPIO9
GPIO7
GPIO8
/
/
2014.03.27