User's Manual

L830-EA M.2 Module Hardware User Manual Page
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of
45
I2S_WA0(PCM_SYNC , PCM frame
synchronization signal)
PCM_SYNC（PCM frame
synchronization signal）
I2S_RX(PCM_DIN , PCM data input)
PCM_DOUT（PCM data output）
I2S_TX(PCM_DOUT , PCM data output)
PCM_DIN（PCM data input）
Note:

PCM interface can be configured as client-server work mode.

Support short frame synchronization at 16, 32, 48, and 64 bit mode

Support burst and continuous mode transmission

Supports clock length of frame synchronization signal and rising edge/ falling edge trigger
configuration of data transmission.

Suitable for various audio sampling frequencies(48KHz, 44.1KHz, 32KHz, 24KHz, 22.5KHz, 16KHz,
12KHz, 11.025KHz and 8KHz).
Note: Cause the timing of I2S modes is easier than PCM modes and easier to fit, recommend clients to
use transmission audio of I2S mode. While transmission with PCM modes, the PCM timing sequence is
difficult to fit to make the tone quality become bad.
5.7 Win8/Android Switch Control Interface
L830-EA M.2 module supports the Win8/Android dual system switch. Check and achieve the switch
function
through interrupt signal ”GNSS_IRQ”.
Pin#
Name
I/O
Description
44
GNSS_IRQ
I
The detection signal of Win8/Android dual system switch,
CMOS 1.8V
The definition of GNSS_IRQ signal function as listed below :
No.
GNSS_IRQ
Function
1
High/Floating
Win8 system supports, , the module`s USB ports shall set as MBIM mode.
2
Low
Android system supports, the module`s `USB ports shall set as 3ACM+3NCM
modes.
Note：
1. Check and achieve the Win8/Android system switch through GNSS_IRQ level while module starting .
Keep the GNSS_IRQ level stability during starting.
2. Check and achieve the Win8/Android system switch through GNSS_IRQ rising edge/ falling edge
while the module starting. The de-bouncing time sets as 100ms. The module will reboot once meeting
all the requirements and switch different system supports.