Hardware Documentation efus™A9X+ efus™A9Xr2
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4.7 Serial ports
92
RXD_A_TTL
UART A RX, Debug interface, 100k pull-up onboard
94
TXD_A_TTL
UART A TX, Debug interface
102
RXD_B_TTL
UART B RX
104
TXD_B_TTL
UART B TX
106
RTS_B_TTL
UART B RTS
108
CTS_B_TTL
UART B CTS
15
RXD_C_TTL
*
UART C RX
*n/a with on board WLAN/BT
17
TXD_C_TTL
*
UART C TX
* n/a with on board WLAN/BT
19
RTS_C_TTL
*
UART C RTS
* n/a with on board WLAN/BT
21
CTS_C_TTL
*
UART C CTS
* n/a with on board WLAN/BT
96
RXD_D_TTL
UART D RX
98
TXD_D_TTL
UART D TX
76
RTS_D_TTL
UART D RTS (default: SPI_A_IRQ1)
78
CTS_D_TTL
UART D CTS (default: SPI_A_IRQ2)
126
RXD_E_TTL
UART E RX (default: I2S_DIN)
86
TXD_E_TTL
UART E TX (default: I2C_B_IRQ)
153
RTS_E_TTL
UART E RTS (default: I2C_A_IRQ)
116
CTS_E_TTL
UART E CTS (default: I2S_LRCLK)
81
RXD_F_TTL
UART F RX (default: SD_B_WP)
83
TXD_F_TTL
UART F TX (default: SD_B_CD)
We recommend to use UART_A for debugging and service only.
UART_E, UART_F and UART_D control are pin sharing options and need special software
support. This functionality is not available on other efus boards and is not available on F&S
evaluation baseboards.
* UART_C is used for onboard Bluetooth if WLAN/BT is mounted and not available
4.8 I2S audio codec interface
The module supports a I2S sound codec.
112
I2S_MCLK
System master clock
116
I2S_LRCLK
I2S frame clock
120
I2S_SCLK
I2S bit clock
124
I2S_DOUT
I2S data output
126
I2S_DIN
I2S data input
130
I2C_C_DAT
Data control signal (shared)
132
I2C_C_CLK
Clock control signal (shared)
