[Tinyos-help] CC2420 Secure Packer Layout

[Morten Tranberg Hansen]

Hi tinyos folks,

I have a question regarding the CC2420 packer layout using its in-line 
secure mode.
As far as a can read from the data sheet, the frame counter and key 
sequence counter is not appended to the packet, and is instead expected 
to be explicit managed. This would result in a secure mode packet of the 
form:

    1     1      0..20        n     2,4,8   2
| FCF | DSN | Addr Info | payload | MAC | FCS |

Instead of the normally expected:

    1     1      0..20           4            1        n     2,4,8   2
| FCF | DSN | Addr Info | Frame Counter | Key ID | payload | MAC | FCS |


Am i right? Does anybody have any experience with that? Can't test it 
myself as I am currently not in position of such a radio.

Thanks in advance,
Morten.