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In IFXARB register, there is a 29 bit "ID", it is a identifier for receiver frame, mask have no effect for it, right?
Answer--> That field holds the Message ID (MSGID). The definition of that field depends on whether the mailbox is a transmit mailbox or a receive mailbox.
If the mailbox is a transmit mailbox, it holds the MSGID of the frame to be transmitted.
If the mailbox is a receive mailbox, it holds the MSGID of the frame to be received, after satisfying the filtering criterion (if any).
