IMX7DCEC datasheet(16/161 Pages) NXP

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Modules list

i.MX 7Dual Family of Applications Processors Datasheet, Rev. 7, 09/2023

NXP Semiconductors

3.1

Special signal considerations

Table 3 lists special signal considerations for the i.MX 7Dual family of processors. The signal names are

listed in alphabetical order.

WDOG1

WDOG3

WDOG4

Watchdog

Timer peripherals

The Watch dog timer supports two comparison points

during each counting period. Each of the comparison

points is configurable to evoke an interrupt to the Arm

core, and a second point evokes an external event on

the WDOG line.

WDOG2

(TrustZone)

Watchdog (TrustZone

technology)

Timer peripherals

The TrustZone Watchdog (TZ WDOG) timer module

protects against TrustZone starvation by providing a

method of escaping Normal mode and forcing a switch

to the TZ mode. TZ starvation is a situation where the

normal OS prevents switching to the TZ mode. Such

situation is undesirable as it can compromise the

system’s security. Once the TZ WDOG module is

activated, it must be serviced by TZ software on a

periodic basis. If servicing does not take place, the

timer times out. Upon a time-out, the TZ WDOG asserts

a TZ mapped interrupt that forces switching to the TZ

mode. If it is still not served, the TZ WDOG asserts a

security violation signal to the CSU. The TZ WDOG

module cannot be programmed or deactivated by a

normal mode SW.

Table 2. i.MX 7Dual modules list(continued)

Block Mnemonic

Block Name

Subsystem

Brief Description

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