[AM5728] Confirm the valid area by the SYS_PWRON_RST reset

Hi,

If you disregard the errata. For Q1 through Q4, Table 3-34 lists the reset sources & the reset domains which they trigger.  

Have in mind the following, described earlier in Section 3.5 Reset Management Functional Description:

• Global reset: Affects the entire logic of the device; all modules are reset. Generally, occurs when the device powers up or an abnormal operation is detected.

• Local reset: Affects one power domain, reset domain, or module

• Cold reset: Occurs only on device power up or in certain emulation modes. The cold reset is a global reset that affects every module in the device. It usually corresponds to the initial POR.

• Warm reset: Occurs when the device is in normal operating state. A module can use a warm reset to reset a subset of its logic. This is often done to speed up reset recovery time; that is, the time to transition to a safe operating state, compared to the time required upon receipt of a cold reset. Warm reset events include software-triggered reset per power domain, watchdog time-out, externally triggered and emulation initiated. 

The following modules are reset upon global cold reset events and not upon global warm reset events:

• All DPLLs associated with the PRCM module

• EMIF

• Control module: CTRL_MODULE_CORE, CTRL_MODULE_WKUP

Kaka said:

[Question.5]
What is the difference between SYS_PWRON_RST and GLOBAL_CLOD_SW_RST?

SYS_PWRON_RST can be received externally from the PORz input pin it is Hardware COLD Reset, while GLOBAL_COLD_SW_RST is generated by setting PRM_RSTCTRL[1]RST_GLOBAL_COLD_SW bit (see Table 3-31. Global Reset Sources) - this is Software COLD Reset.

Kaka said:

[Question.6]
For region of CM_CORE_AON_RST is defined the both reset source(Warm and Cold). So, customer can be reset the CM_CORE_AON_RST region by warm and cold reset signal. Is my understanding correct?

Correct, this reset domain can be triggered by both global warm & global cold reset signals. 

Best Regards, 
Yordan