LEON-G100 / LEON-G200 - System Integration Manual
GSM.G1-HW-09002-G3
Preliminary
System description
Page 68 of 125
1.10.2.2
Normal I
2
S mode
Normal I
2
S mode supports:
16 bits word
Mono interface
8 kHz frequency
Main features of I
2
S interface in Normal I
2
S mode:
I2S_WA
signal always runs at 8 kHz and the channel can be either high or low
I2S_TX
data 16 bit words with 32 bit frame and 2, dual mono (the word can be written on 2 channels).
Data are in 2’s complement notation. MSB is transmitted first. The MSB is first transmitted; the bits change
on
I2S_CLK
rising or falling edge (configurable)
I2S_RX
data are read on the
I2S_CLK
edge opposite to
I2S_TX
writing edge
I2S_CLK
frequency depends by the number of bits and number of channels so is 16 x 2 x 8 kHz = 256 kHz
The modes are configurable through a specific AT command (refer to
u-blox AT Commands Manual
[2]) and the
following parameters can be set:
I2S_TX
word can be written while
I2S_WA
is high, low or both
MSB can be 1 bit delayed or non-delayed on
I2S_WA
edge
I2S_TX
data can change on rising or falling edge of
I2S_CLK
signal
I2S_RX
data read on the opposite front of
I2S_CLK
signal
