MPC5xxxのトピックRe: Nexus 3 frame format

Nexus 3 frame format

manuelsaez — Tue, 19 Jul 2016 10:19:45 GMT

Hi,

trying to decode the Nexus frames I came to a question that I could not find in the reference manual.

In chapter "63.7 Nexus message fields" the reference manual stays that:

"A packet may contain any number of fixed length fields, but may contain at most one variable length field."

However in Charpter 63.3 TCODEs supported there are frame with up to 3 variable fields (like the Program Trace - Indirect Branch Messages). How can I know then what is the length of each field?

Best regards,

Manuel

Re: Nexus 3 frame format

lukaszadrapa — Wed, 20 Jul 2016 13:09:50 GMT

Hi,

there are two different things: packet and message. Message can contain more packets.

Here is nice example for Indirect Branch Message:

Example:

MSEO is used to indicate start/end of packet/message:

Regards,

Lukas

Re: Nexus 3 frame format

manuelsaez — Wed, 20 Jul 2016 13:32:13 GMT

That's very helpful!.

Since I am accessing the nexus interface through Lauterbach I have no access to the pins and I cannot see the separation between messages and packets but that's something I have to clarify somewhere else :-).

Thank you!.