Civil Engineering Reference
In-Depth Information
Fig. 3.11
FIFO/gateway running at different speeds
3.4.2.5
Shared-GW-Modus
In case of sporadic messages, which shall be rerouted to the other bus, it is possible
to configure a single message object to be a GW. This is the so-called Shared GW
Mode. If a message is received, the message object switches to transmission on
the second CAN node. The message is sent according to CAN prioritization rules.
Depending on the settings, it switches back automatically. This feature only exists
on TwinCAN but not on its successor, the MultiCAN module.
Another feature of the TwinCAN module is the so-called analyser mode.
3.4.2.6
Analyser Mode
Starting with TwinCAN, a so-called analyser mode has been introduced to Infineon-
microcontrollers. It is comparable to a listen-only mode. This feature gives the pos-
sibility to switch a CAN node silent. The CAN node will listen to bus and save the
understood messages with the corresponding identifiers into the message objects,
but is not taking part actively on the bus. The node will not send any acknowledge-
ment or any error signalling to the bus. If a baud rate detection is implemented, this
mode can be used to switch the node silent during the detection phase and not to
spam the bus with error messages. If the CAN module becomes active, the analyser
feature needs to be disabled, but not the complete node needs to be reconfigured.
With this feature, it is also possible to have both nodes on the very same bus,
but only one node is active. With the help of the reception on the second node, a
software comparison can be done. This is useful in case of safety application (higher
