Table 21. PCM pin definition
Pin Name
I/O
Pin Number
Description
I2S_SCK
IO
20
PCM clock signal, I2S_SCLK(Reserved),
UART1_RTS(Reserved)
I2S_RX
DI
22
PCM input signal, I2S_D0(Reserved),
UART1_RX(Reserved)
I2S_TX
DO
24
PCM output signal, I2S_D1(Reserved),
UART1_CTS(Reserved)
I2S_WA
IO
28
PCM sync signal, I2S_WS(Reserved),
UART1_TX(Reserved)
I2S_MCLK
DO
68
I
2
S main clock signal (reserved)
Default transmission clock frequency is TBD MHz, sampling rate is TBD KHz, and
resolution is TBD bit. The PCM channel can also be configured as I
2
S interface. Please
contact Fibocom technical support for adjustment.
5.6.2. PCM Application Circuit
The application reference circuit of the external Codec chip of the PCM interface is shown
in the following figure.
5. Functional Interface
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