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L810-MiniPCIeHardware User Manual
Page 19 of 26
5.3 Digital Audio Interface
5.3.1 Audio Interface
L810-MiniPCIe supports I2S digital audio interface, and it supports the ordinary l2S mode and PCM mode.
The signal level of the l2S interfaces is 1.8V.
Description for l2S signals is as follows:
Pin
Pin name
I/O
Pin description
Voltage
45
I2S2_CLK
O
I2S clock
CMOS 1.8V
47
I2S2_TX
O
I2S data transmit
CMOS 1.8V
49
I2S2_RX
I
I2S data receive
CMOS 1.8V
51
I2S_WA0
O
I2S left and right channel clock (LRCK)
CMOS 1.8V
5.3.2 I2S Application Description
L810-MiniPCIe
Signal direction
Audio CODEC I2S Port
I2S2_CLK
I2S_CLK
I2S2_TX
I2S_SDIN
I2S2_RX
I2S_SDOUT
I2S2_WA0
I2S_LRCK
Description:
l2S interface can be configured as master or slave mode.
It supports multiple audio sampling rates (44.1KHz, 32KHz, 24KHz, 16KHz, 8KHz).
5.3.3 Application Description for PCM Mode
L810-MiniPCIe
Signal flow direction
Audio CODEC PCM Port
I2S2_CLK(PCM_CLK, PCM clock signal)
PCM_CLK (PCM clock signal)
I2S2_TX(PCM_DOUT, PCM data output)
PCM_DIN (PCM data input)
I2S2_RX(PCM_DIN, PCM data input)
PCM_DOUT (PCM data
output)
I2S2_WA0(PCM_SYNC, PCM frame
sync signal)
PCM_SYNC (PCM frame sync
signal)
