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FIBOCOM FG621-LA Series Hardware Guide
Page 36 of 57
Pin Name
I/O
Pin#
Description
I2C_SDA
42
DIO
I
2
C interface data signal, pulled up inside the module
I2C_SCL
43
DO
I
2
C interface data signal, pulled up inside the module
5.8 PCM Digital Audio Interface
FG621-LA series module provides a digital audio interface (PCM) for communication with digital audio
devices such as an external Codec.
5.8.1 Support Model
Table 5-13 Support model of PCM
Product Model
Description
FG621-LA-00 series
Support
5.8.2 PCM Interface Definition
The interface signals include the transmission clock PCM_CLK, the frame synchronization signal
PCM_SYNC, and the input and output PCM_DIN/PCM_DOUT.
Table 5-14 PCM interface definition
Pin Name
I/O
Pin#
Description
PCM_SYNC
IO
65
PCM data synchronization signal
PCM_IN
DI
66
PCM data input
PCM_CLK
IO
67
PCM clock
PCM_OUT
DO
68
PCM data output
5.8.3 PCM Interface Description
Table 5-15 PCM interface description
Pin Name
Frequency Duty Cycle Coded Format Operating Mode
Description
PCM_CLK
2.048MHz
50%
16bit
Linermono
Module serves as
master,
supporting PCM
as slave
PCM clock
PCM_OUT
-
-
PCM data output
PCM_IN
-
-
PCM data input
PCM_SYNC 8KHz
Short pulse
PCM data
synchronization
signal (falling edge
sampling)
FG621-LA series module adopts the above configuration by default. For any adjustment, please contact