Datasheet
Boot mode configuration
i.MX RT1015 Crossover Processors Data Sheet for Consumer Products, Rev. 0.1, 03/2019
NXP Semiconductors 57
5 Boot mode configuration
This section provides information on boot mode configuration pins allocation and boot devices interfaces
allocation.
5.1 Boot mode configuration pins
Table 51 provides boot options, functionality, fuse values, and associated pins. Several input pins are also
sampled at reset and can be used to override fuse values, depending on the value of BT_FUSE_SEL fuse.
The boot option pins are in effect when BT_FUSE_SEL fuse is ‘0’ (cleared, which is the case for an
unblown fuse). For detailed boot mode options configured by the boot mode pins, see the i.MX RT1015
Fuse Map document and the System Boot chapter in i.MX RT1015 Reference Manual (IMXRT1015RM).
5.2 Boot device interface allocation
The following tables list the interfaces that can be used by the boot process in accordance with the specific
boot mode configuration. The tables also describe the interface’s specific modes and IOMUXC allocation,
which are configured during boot when appropriate.
Table 51. Fuses and associated pins used for boot
Pad Default setting on reset eFuse name Details
GPIO_EMC_16 100 K pull-down src.BOOT_MODE0
GPIO_EMC_17 100 K pull-down src.BOOT_MODE1
GPIO_EMC_18 100 K pull-down src.BT_CFG[0] Boot Options, Pin value overrides fuse
settings for BT_FUSE_SEL = ‘0’.
Signal Configuration as Fuse Override
Input at Power Up.
These are special I/O lines that control
the boot up configuration during
product development. In production,
the boot configuration can be
controlled by fuses.
GPIO_EMC_19 100 K pull-down src.BT_CFG[1]
GPIO_EMC_20 100 K pull-down src.BT_CFG[2]
GPIO_EMC_21 100 K pull-down src.BT_CFG[3]
GPIO_EMC_22 100 K pull-down src.BT_CFG[4]
GPIO_EMC_23 100 K pull-down src.BT_CFG[5]
GPIO_EMC_24 100 K pull-down src.BT_CFG[6]
GPIO_EMC_25 100 K pull-down src.BT_CFG[7]
GPIO_EMC_26 100 K pull-down src.BT_CFG[8]
GPIO_EMC_27 100 K pull-down src.BT_CFG[9]
Table 52. Boot through FlexSPI
PAD Name IO Function Mux Mode Comments
GPIO_SD_B1_00 flexspi.B_DATA[3] ALT 1 —
GPIO_SD_B1_03 flexspi.B_DATA[2] ALT 1 —
GPIO_SD_B1_04 flexspi.B_DATA[1] ALT 1 —
GPIO_SD_B1_02 flexspi.B_DATA[0] ALT 1 —