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FD protect

IP.com Disclosure Number: IPCOM000249945D
Publication Date: 2017-May-05
Document File: 2 page(s) / 779K

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The IP.com Prior Art Database


In the last CAN FD plugfest, engineering silicon of FD Shield transceivers was presented, which allows to communicate with a Classical CAN controller in a CAN FD network. Here a flavor of FD shield which is called FD Protect, which detects using a Classical CAN decoder, that a frame turns into a CAN FD frame, but does not decode the CAN FD frame. A "Shield mode" is entered to make the fast phase invisible for the protected Classical CAN controller. The "Shield mode" is left either after a timeout during which no CAN FD frame has been received, or after decoding a correct Classical CAN frame.

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FD protect  A new flavor of FD Shield to speed up CAN FD in mixed networks even more 

FD protect allows SW download with 5 Mbps in networks where still Classical CAN controllers exist 

In the last CAN FD plugfest, engineering silicon of FD Shield transceivers was presented, which allows to  communicate with a Classical CAN controller in a CAN FD network. The FD Shield transceiver makes sure  that the Classical CAN controller does not receive ‐ and thus does not disturb ‐ CAN FD frames, while  maintaining the ability to arbitrate against CAN FD and Classical CAN frames on the same physical layer.  This becomes possible with integrating a CAN FD decoder in the transceiver that manipulates the RXD  and TXD signals accordingly. Major challenge in implementing the FD Shield functionality is the precise  on chip oscillator that is needed to drive the CAN FD decoder. Today FD Shield is limited to a bit rate in  the fast phase of at most 2 Mbps since the speed and precision of the current oscillator implementation  does not allow for higher bit rates. Some equipment manufacturers, however, are looking for a solution  that allows to download SW with up to 5 Mbps to some modules while other modules on the same phy‐ sical layer are not CAN FD capable. Such use cases constitute a dedicated operation mode of the system  which do not necessarily require that Classical CAN and CAN FD frames need to arbitrated against each  other. Here a flavor of FD shield which is called FD Protect can so...