AT32UC3C1512C Automotive Atmel Corporation, AT32UC3C1512C Automotive Datasheet - Page 287
AT32UC3C1512C Automotive
Manufacturer Part Number
AT32UC3C1512C Automotive
Description
Manufacturer
Atmel Corporation
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2.AT32UC3C0512C_AUTOMOTIVE.pdf
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16.4.2.3
16.4.3
9166C–AVR-08/11
Slave and Master assignation
Fixed Priority Arbitration
rent transfer, if no other master request is pending, the slave remains connected to the last
master that performed the access. Other non privileged masters still get one latency cycle if they
want to access the same slave. This technique can be used for masters that mainly perform sin-
gle accesses.
This is another biased round-robin algorithm. It allows the Bus Matrix arbiters to remove the one
latency cycle for the fixed default master per slave. At the end of the current access, the slave
remains connected to its fixed default master. Every request attempted by this fixed default mas-
ter will not cause any latency whereas other non privileged masters will still get one latency
cycle. This technique can be used for masters that mainly perform single accesses.
This algorithm allows the Bus Matrix arbiters to dispatch the requests from different masters to
the same slave by using the fixed priority defined by the user. If two or more master requests are
active at the same time, the master with the highest priority number is serviced first. If two or
more master requests with the same priority are active at the same time, the master with the
highest number is serviced first.
For each slave, the priority of each master may be defined through the Priority Registers for
Slaves (PRAS and PRBS).
The index number assigned to Bus Matrix slaves and masters are described in the Module Con-
figuration section at the end of this chapter.
• Round-Robin Arbitration with Fixed Default Master
AT32UC3C
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