IMX93CEC datasheet(80/123 Pages) NXP

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Table 93. Fuses and associated pins used for boot ...continued

BOOT_MODE[3:0]

Function

1001

LPB: Serial Downloader (USB1)

1010

LPB: uSDHC1 8-bit 1.8 V eMMC 5.1

1011

LPB: uSDHC2 4-bit SD 3.0

1100

LPB: FlexSPI Serial NOR

1101

LPB: FlexSPI Serial NAND 2K

1110

Reserved

1111

Reserved

• HW samples the boot CFG pins before ROM starts, these pins should be mapped to Boot CFG pins by default.

• Once HW samples the boot CFG pins and stores the boot CFG in CMC register, the register should be latched. The register

value is no more changes and reflecting the pins status.

Additional boot options are also supported for both Normal Boot Mode and Internal Fuse mode:

• All boot modes support for a range of speeds, timings, and protocol formats;

• eMMC and SD boot can be supported from any USDHC instance 1 or 2;

• Serial NOR boot supports for 1-bit, 4-bit, and 8-bit mode;

• Serial NAND boot supports for 1-bit, 4-bit, and 8-bit mode (8-bit Serial NAND)

BOOT_MODE pins are multiplexed over other functional pins. The functional I/O that are multiplexed with these pins must be

selected subject to two criteria:

• Functional I/O must not be used if they are inputs to the SoC, which could potentially be constantly driven by external

components. Such functional mode driving may interfere with the need for the board to pull these pins a certain way while

POR is asserted.

• Functional I/O must not be used if they are outputs of the SoC, which will be connected to components on the board that may

misinterpret the signals as valid signals if they are toggled (such as, the board drives them while POR is asserted).

5.2 Boot device interface allocation

i.MX 93 supports three kinds of boot devices:

• Primary Boot Device

The primary boot device is selected by Boot Config pins if boot mode is the Normal Boot or Internal Fuses Boot.

The valid primary boot device options are SD/eMMC/FlexSPI NOR/FlexSPI NAND. The valid options also depend

on the Boot Type and other fuses configuration.

• Recovery Boot Device

After failure of booting from Primary Boot Device, i.MX 93 tries to boot from another boot source. The recovery

boot device is only from SPI1/2/3/4.

• Serial Download Boot Device

Both Cortex®-M33 and Cortex®-A55 support serial download mode via USB1.

NXP Semiconductors

IMX93CEC

i.MX 93 Applications Processors Data Sheet for Commercial Products

IMX93CEC

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 7 — 12 February 2026

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