• During C/S write by CPU in BusIdle. First C/S write starts arbitration process and a
second C/S write during this same arbitration restarts the process. If other C/S writes
are performed, Tx arbitration process is pending. If there is no arbitration winner
after the arbitration process has finished, then the TX arbitration machine begins a
new arbitration process. If there is a pending arbitration and BusIdle state starts then
an arbitration process is triggered. In this case the first and second C/S write in
BusIdle will not restart the arbitration process. It is possible that there is not enough
time to finish arbitration in WaitForBusIdle state and the next state is Idle. In this
case the scan is not interrupted, and it is completed during BusIdle state. During this
arbitration C/S write does not cause arbitration restart.
• Arbitration winner deactivation during a valid arbitration window.
• Upon exiting Freeze mode (first bit of the WaitForBusIdle state). If there is a re-
synchronization during WaitForBusIdle, the arbitration process is restarted.
Arbitration process stops in the following situations:
• All Mailboxes were scanned
• A Tx active Mailbox is found in case of Lowest Buffer feature enabled
• Arbitration winner inactivation or abort during any arbitration process
• There was not enough time to finish Tx arbitration process (for instance, when a
deactivation was performed near the end of frame). In this case arbitration process is
pending.
• Error or Overload flag in the bus
• Low Power or Freeze mode request in Idle state
Arbitration is considered pending as described below:
• It was not possible to finish arbitration process in time
• C/S write during arbitration if write is performed in a MB whose number is lower
than the Tx arbitration pointer
• Any C/S write if there is no Tx Arbitration process in progress
• Rx Match has just updated a Rx Code to Tx Code
• Entering Busoff state
C/S write during arbitration has the following effect:
• If C/S write is performed in the arbitration winner, a new process is restarted
immediately.
• If C/S write is performed in a MB whose number is higher than the Tx arbitration
pointer, the ongoing arbitration process will scan this MB as normal.
Functional description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
1438
NXP Semiconductors
Содержание KE1xF Series
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