RM0082
Pin description
Doc ID 018672 Rev 1
Note:
Other combinations are reserved.
5.3.4 GPIOs
Some PL_GPIO pins can be used as software controlled general purpose I/Os (GPIOs).
●
6 base GPIOs can be enabled as alternate functions on PL_GPIO.
●
18 GPIO are provided by the RAS IPs G8 and G10 on PL_GPIO.
●
18 GPIOs are available if the GPIO/ keyboard controller is configured in GPIO mode
5.3.5 Multiplexing
scheme
The two multiplexers shown in
are controlled by different registers. The first
multiplexer selects the I/O functions of the RAS IPs in one of 13 modes shown in
“Configuration mode” columns in
). This selection is programmable via 4 bits in RAS
register 2.
The second multiplexer is controlled by RAS register 1 and allows you to enable the I/O
functions shown in alternate functions column of
Table 11.
Booting pins
B3-B0
Boot device
0000
USB Device
0001
ETH - MAC address in I2C
0010
ETH - MAC address in SPI
0011
Serial NOR
0100
Parallel NOR 8bit (FSMC)
0101
Parallel NOR 16bit (FSMC)
0110
Nand 8bit
0111
Nand 16bit
1010
UART