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The Arbitration bits ID[28:0], Xtd, and Dir are used to define the identifier and type of outgoing messages and (together with the Mask bits Msk[28:0], MXtd, and MDir) for acceptance filtering of incoming messages.
Mask Message Direction
0 The message direction bit (Dir) has no effect on acceptance filtering.
1 The message direction bit (Dir) is used for acceptance filtering.
