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Initialization/application information
After granted access to a slave port, a master may perform as many transfers as desired to
that port until another master makes a request to the same slave port. The next master in
line is granted access to the slave port at the next transfer boundary, or possibly on the
next clock cycle if the current master has no pending access request.
As an example of arbitration in round-robin mode, assume the crossbar is implemented
with master ports 0, 1, 4, and 5. If the last master of the slave port was master 1, and
master 0, 4, and 5 make simultaneous requests, they are serviced in the order: 4 then 5
then 0.
The round-robin arbitration mode generally provides a more fair allocation of the
available slave-port bandwidth (compared to fixed priority) as the fixed master priority
does not affect the master selection.
20.5 Initialization/application information
No initialization is required for the crossbar switch.
See the AXBS section of the configuration chapter for the reset state of the arbitration
scheme.
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
336
Freescale Semiconductor, Inc.
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