IMX91CEC datasheet(66/100 Pages) NXP

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TCSS

TCK

T DVO

T DHO

T DVO

T DHO

T CSH

FLEXSPI_SCLK

FLEXSPI_SSx_B

FLEXSPI_DATA[7:0]

Figure 48. FlexSPI output timing in DDR mode

4.12.10 USB PHY parameters

The USB PHY parameters meet the electrical compliance requirements listed as following:

•

Universal Serial Bus Revision 2.0 Specification (including ECNs and errata), On-The-Go and Embedded Host Supplement

to the Universal Serial Bus Revision 2.0 Specification (including ECNs and errata)

4.12.10.1 Pad/Package/Board connections

The USBx_VBUS pin cannot directly connect to the 5 V VBUS voltage on the USB2.0 link.

Each USBx_VBUS pin must be isolated by an external 30 KΩ 1% precision resistor.

The USB 2.0 PHY uses USBx_TXRTUNE and an external resistor to calibrate the USBx_DP/DN 45 Ω source impedance. The

external resistor value is 200 Ω 1% precision on each of USBx_TXRTUNE pad to ground.

5 Boot mode configuration

This section provides information on boot mode configuration pins allocation and boot devices interfaces allocation.

i.MX 91 supports three different boot modes:

• Normal Boot Mode

• Boot from Internal Fuse Mode

• Serial Download Boot Mode

Three different boot modes can be either selected via different boot mode pins or overridden by fuses.

i.MX 91 supports Single Boot: Cortex-A55 core is in charge of loading all containers and images.

For detailed boot mode configuration, see the see the i.MX 91 Fuse Map and the System Boot chapter in

i.MX 91 Reference

Manual (IMX91RM).

5.1 Boot mode configuration pins

There are four boot mode pins used to select boot mode.

Table 77. Fuses and associated pins used for boot

BOOT_MODE[3:0]

Function

x000

Boot from Internal Fuses

0001

Serial Download (USB1)

Table continues on the next page...

NXP Semiconductors

IMX91CEC

i.MX 91 Application Processors Data Sheet for Commercial Products

IMX91CEC

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

Preliminary Data Sheet

Rev. 2 — 12 November 2024

Preliminary - Subject to Change Without Notice

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