[Jetson thor][power]SYS_RESET_N信号是由Thor模组控制还是button mcu控制?

Robotics & Edge Computing Jetson Systems Jetson Thor
1

在DG文档的下电时序中，需要把SYS_RESET_N拉低，文档中显示该管脚是双向管脚，那么这个下电时序图中SYS_RESET_N是thor芯片拉低的还是mcu拉低的？恕我直言，此处文档应补充说明该信号由谁控制。

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3

Since there is a timing requirement between the MODULE_POWER_ON input and the SYS_RESET_N bidirectional signal, the source of the MODULE_POWER_ON (presumably an MCU on the carrier) should also assert SYS_RESET_N from the carrier side within the required 0~25us period.

4

但是在button mcu (EFM8SB10F2G) 的固件代码中没有看到对SYS_RESET_N (P1.1) 的控制输出操作

5

SYS_RESET is in an input to the Button MCU, not an output.

From the Jetson Thor Series Modules Interface Design Guide:

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6

So who controls the output SYS_RESET_N pin in carrier?

7

As per Jetson Thor Series Modules Interface Design Guide, the power sequencer drives it and the carrier board can optionally drive it:

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8

This is a poor design; a single pin should not be ambiguous.

9

The SYS_RESET_N is bidirectional and open-drain, so it allows for multiple sources to assert reset. The power sequencer on the module releases the reset during boot. The carrier board may hold it low until ready, then release it — or it can simply leave it released (not assert at all) if no delay is needed.

10

carrier board 如何判断reset何时被power sequencer释放呢？