Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Avalon CAN controller IP from Opencores

I know that this question has made before. But I would like to know if someone implemented an Avalon based ip for the CAN controller from Opencores http://opencores.org/project,can. The opencores version is on Wishbone. I think it is mentioned that there was a version in the past on Niosforum but I cant find anything. It would be really useful if somene who made the bus connection can share the IP. Thanks:

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    If you look at the timing diagrams for wishbone and Avalon, you will find that they are very close. You should be able to modify the wishbone version to work with Avalon.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    --- Quote Start ---

    If you look at the timing diagrams for wishbone and Avalon, you will find that they are very close. You should be able to modify the wishbone version to work with Avalon.

    --- Quote End ---

    Could you recommend something like a tutorial how this modification can be done. I've never made something similar in the past and I don't know where to start.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    Followin thuis post http://www.alteraforum.com/forum/showthread.php?t=39783 there is a wrapper already been made for this purposse. Ive compiled the files and works fine. The problem that I have is to attach the signals in qsys when I create a new component. So a first question is in which interface should CAN interface signals attached? 

    // CAN interface
	input					CAN_clk,
	input					CAN_reset,
	input					CAN_rx,
	output				CAN_tx,
	output       			        CAN_bus_off,
	output       			        CAN_irq,
	output       			        CAN_clkout
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    10 years ago

    Use a conduit. Then you can export the conduit interface in your QSys system to connect those signals to ports on the QSys generated component.