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L810-MiniPCIeHardware User Manual
Page 20 of 26
Description:
PCM mode interface can be configured as master or slave mode.
It supports short frame sync for 16, 32, 48, and 64 bit mode.
It supports burst and continuous transmission modes.
It supports clock length trigger for frame sync signal and rising/falling edge trigger for data
transmission.
It supports various audio sampling rates (48KHz, 44.1KHz, 32KHz, 24KHz, 22.5KHz,
16KHz, 12KHz, 11.025KHz and 8KHz).
Note:
Because of the timing of I2S mode is simpler than PCM mode, it is recommended to use I2S
mode for audio transmission. For PCM mode, the audio quality issues caused by the PCM timing
adjusting must be avoided.
5.4 UART Interface
5.4.1 UART Interface Description
L810-MiniPCIe provides one four-line UART, and the user can receive and send AT command through
UART1 and auto baud rate is supported.
Pin
Pin name
I/O
Pin description
Voltage
11
UART1_RX
I
UART1 data receive signal
3.3V
13
UART1_TX
O
UART1 data transmit signal
3.3V
23
UART1_CTS
I
UART1 clear to send signal
3.3V
25
UART1_RTS
O
UART1 request to send signal
3.3V
5.4.2 UART Interface Application
Uart Rx/Tx signal direction shows in the following tables::
MCU(DTE)
Signal flow direction
L810-MiniPCIe module (DCE)
RXD
UART1_TXD
TXD
UART1_RXD
Note:
The voltage level for L810-MiniPCIe UART is 3.3V, and voltage matching should be handled
when connecting to DTE.
