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AM3505: Internal reset sources

Part Number: AM3505

From the 24.2.2.3 of AM35X TRM(http://www.ti.com/lit/ug/sprugr0c/sprugr0c.pdf) , I saw the ‘sys_nreswarm’ signal will be triggered by ‘internal reset’. 

I'm wondering what does the ‘internal reset’ mean, what are the detail types of internal reset and what are the detail causes.