About the module Multiplexed GPIO
ConnectCore for i.MX51 Hardware Reference Manual
47
GPIO Mode Pad On module default as
GPIO1_17 ALT2 USBH1_DATA6 USB Host
GPIO1_18 ALT2 USBH1_DATA7 USB Host
GPIO1_19 ALT5 DISP2_DAT6 Ethernet 1
GPIO1_20 ALT3 UART2_RXD UART2_RXD
GPIO1_21 ALT3 UART2_TXD UART2_TXD
GPIO1_22 ALT3 UART3_RXD UART3_RXD
GPIO1_23 ALT3 UART3_TXD UART3_TXD
GPIO1_24 ALT3 OWIRE_LINE S/PDIF Output
GPIO1_25 ALT2 USBH1_CLK USB Host
GPIO1_26 ALT2 USBH1_DIR USB Host
GPIO1_27 ALT2 USBH1_STP USB Host
GPIO1_28 ALT2 USBH1_NXT USB Host
GPIO1_29 ALT5 DISP2_DAT7 Ethernet 1
GPIO1_30 ALT5 DISP2_DAT8 Ethernet 1
GPIO1_31 ALT5 DISP2_DAT9 Ethernet 1
GPIO2_0 ALT1 EIM_D16 EIM_D16
GPIO2_1 ALT1 EIM_D17 EIM_D17
GPIO2_2 ALT1 EIM_D18 EIM_D18
GPIO2_3 ALT1 EIM_D19 EIM_D19
GPIO2_4 ALT1 EIM_D20 EIM_D20
GPIO2_5 ALT1 EIM_D21 EIM_D21
GPIO2_6 ALT1 EIM_D22 EIM_D22
GPIO2_7 ALT1 EIM_D23 EIM_D23
GPIO2_8 ALT1 EIM_D24 EIM_D24
GPIO2_9 ALT1 EIM_D27 EIM_D27
GPIO2_10 ALT1 EIM_A16 GPIO
GPIO2_11 ALT1 EIM_A17 GPIO
GPIO2_12 ALT1 EIM_A18 GPIO
GPIO2_13 ALT1 EIM_A19 GPIO
GPIO2_14 ALT1 EIM_A20 GPIO
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