Nexus 3 frame format

[manuelsaez]

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

[lukaszadrapa · Accepted solution]

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

[manuelsaez]

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!.