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Craneboard AM3517: "BUS_FET_ENABLE" signal

Kentxu
Intellectual 280 points
Other Parts Discussed in Thread: AM3517

Hello,

I was wondering what is the purpose of the BUS_FET_ENABLE signal on the Craneboard design.

It disconnects DVI, HSUSB and ETH when the system is in reset (SYS_nRESWARM_OUT signal is low), but do these really need to be disconnected? (They remain connected on the LigicPD design).

It seems to me that this signal and the associated buffers are redundant. Perhaps someone could clarify this point.

Any comments welcome!

  • 0
    TI__Guru* 86930 points

    Queries on craneboard should be posted in the community forums on craneboard.org.

    The BUS_FET_ENABLE signal just provides isolation between the AM3517 and some of the other components on the board.  It is possible to power the AM3517 and a subset of the board components with just USB power, thus leaving some of the other components unpowered.  The buffers eliminate the possiblity of damage to these components in this mode.

    Regards,

    James