topic About EXT_TAMPER in Vybrid Processors

About EXT_TAMPER

keisukewatanabe — Mon, 29 Jul 2013 10:35:29 GMT

Dear support,

We assume that the EXT_TAMPER0-5 are for access the fuse which is already blown,

can we connect these directly to the GND, in case we don't use this function?

In the reference board, this was connected to the GND via 10Kohm resister,

is this resister necessary?

Best regards,

Keisuke

Re: About EXT_TAMPER

anthony_huereca — Mon, 29 Jul 2013 18:19:15 GMT

Hi Keisuke,

The tamper pins are used as part of the security sub-system for external tamper detection. If they are not being used in your system, you should tie them to ground. The resistors are on the tower board to allow for flexibility of connecting them to VDD to try out the tamper capabilities.

-Anthony

Re: About EXT_TAMPER

keisukewatanabe — Thu, 01 Aug 2013 10:37:12 GMT

Dear Anthony,

Thank you for your reply.

I want to know a detail about the tamper.

Is there a material?

Best regards,

Keisuke Watanabe

Re: About EXT_TAMPER

jiri-b36968 — Thu, 01 Aug 2013 12:01:01 GMT

Hi Keisuke,

You need Vybrid Security Reference Manual. It can be downloaded from VF6xx Product Summary Page

You need to submit form to request permission to download this item. http://www.freescale.com/webapp/sps/download/mod_download.jsp?colCode=VYBRIDSRM&appType=moderatedWithoutFAE&fpsp=1&WT_TY…

/Jiri

Re: Re: About EXT_TAMPER

naoumgitnik — Fri, 09 Aug 2013 17:01:29 GMT

Dear Keisuke,

Just a small clarification (which originally came from Anthony as well) of why connecting the tamper output pins directly to ground is allowed when they are not used. - By default all the tamper pins are inputs. The active tamper detection has to be enabled for those pins to become outputs.

Sincerely yours, Naoum Gitnik.