About the module Multiplexed GPIO
ConnectCore for i.MX51 Hardware Reference Manual
48
GPIO Mode Pad On module default as
GPIO2_15 ALT1 EIM_A21 GPIO
GPIO2_16 ALT1 EIM_A22 GPIO
GPIO2_17 ALT1 EIM_A23 GPIO
GPIO2_18 ALT1 EIM_A24 GPIO
GPIO2_19 ALT1 EIM_A25 GPIO
GPIO2_20 ALT1 EIM_A26 GPIO
GPIO2_21 ALT1 EIM_A27 XBEE_SLEEP_RQ
GPIO2_22 ALT1 EIM_EB2 EIM_EB2
GPIO2_23 ALT1 EIM_EB3 EIM_EB3
GPIO2_24 ALT1 EIM_OE EIM_OE
GPIO2_25 ALT1 EIM_CS0 EIM_CS0
GPIO2_26 ALT1 EIM_CS1 GPIO
GPIO2_27 ALT1 EIM_CS2 GPIO
GPIO2_28 ALT1 EIM_CS3 GPIO
GPIO2_29 ALT1 EIM_CS4 GPIO
GPIO2_30 ALT1 EIM_CS5 Ethernet 2 Controller chip select
GPIO2_31 ALT1 EIM_DTACK GPIO
GPIO3_0 ALT4 DI1_PIN11 LCD1 PWREN
GPIO3_1 ALT4 DI1_PIN12 LCD2 PWREN
ALT1 EIM_LBA GPIO
GPIO3_2 ALT4 DI1_PIN13 GPIO
ALT1 EIM_CRE GPIO
GPIO3_3 ALT4 DI1_D0_CS LCD Touch Screen interrupt
ALT3 NANDF_WE_B NANDF_WE_B
GPIO3_4 ALT4 DI1_D1_CS LCD1_TCH_INT/TCH_EXT#
ALT3 NANDF_RE_B NANDF_RE_B
GPIO3_5 ALT4 DISPB2_SER_DIN GPIO
ALT3 NANDF_ALE NANDF_ALE
GPIO3_6 ALT4 DISPB2_SER_DIO User Button 1 / GPIO
ALT3 NANDF_CLE NANDF_CLE
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