Bus arbitration apparatus and method
AssigneeCanon Kabushiki Kaisha
InventorsToshiaki Minami, Shunichi Kaizu, Yasunari Nagamatsu, Daisuke Shiraishi, Makoto Fujiwara, Koji Moriya, Koichi Morishita
Life of this patent
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Abstract
A bus arbitration apparatus according to this invention appropriately arbitrates bus rights of use between a plurality of masters and a plurality of slaves so as to efficiently perform requested data transfer. An arbiter A 5 receives data transfer requests with respect to a slave A 3 generated by masters A 1 and B 2. The arbiter A 5 cooperates with an arbiter B 4, and arbitrates a contention of the data transfer requests with respect to the slave A 3 generated by the masters A 1 and B 2.
Claims9
1-14. (canceled)
A bus arbitration apparatus which arbitrates a contention of data transfer to a slave requested by a plurality of masters in a bus system in which the plurality of masters and the slave are connected, comprising:
- a reception unit configured to receive data transfer requests to the slave from the plurality of masters;
- and
- an arbitration unit configured to cooperate with another bus arbitration apparatus which arbitrates a contention of data transfer on a second bus requested by the plurality of masters, and to arbitrate the contention of the data transfer on a first bus requested by the plurality of masters,
- wherein the arbitration unit includes a detection unit configured to detect a data transfer waiting state in the other bus arbitration apparatus, and arbitrates the contention of the data transfer to the slave requested by the plurality of masters in accordance with the data transfer waiting state in the other bus arbitration apparatus.
A bus arbitration apparatus which arbitrates a contention of data transfer to a slave requested by a plurality of masters in a bus system in which the plurality of masters and the slave are connected, comprising:
- a reception unit configured to receive data transfer requests to the slave from the plurality of masters;
- and
- an arbitration unit configured to cooperate with another bus arbitration apparatus which arbitrates a contention of data transfer on a second bus requested by the plurality of masters, and to arbitrate the contention of the data transfer on a second bus requested by the plurality of masters,
- wherein the arbitration unit arbitrates the contention of data transfer in accordance with an in-order transfer requested by one of the plurality of masters.
A bus arbitration method which causes a bus arbitration apparatus corresponding to a slave to arbitrate a contention of data transfer requested to the slave by a plurality of masters in a bus system in which the plurality of masters and the slave are connected, comprising:
- receiving data transfer requests to the slave from the plurality of masters;
- and
- cooperating with another arbitration apparatus which arbitrates a contention of data transfer on a second bus requested by the plurality of masters, and arbitrating the contention of the data transfer on a first bus requested by the plurality of masters,
- wherein the bus arbitration apparatus detects a data transfer waiting state in the other bus arbitration apparatus, and in accordance with the data transfer waiting state in the other bus arbitration apparatus, arbitrates the contention of the data transfer to the slave requested by the plurality of masters.
A bus arbitration method which causes a bus arbitration apparatus corresponding to a slave to arbitrate a contention of data transfer requested to the slave by a plurality of masters in a bus system in which the plurality of masters and the slave are connected, comprising:
- receiving data transfer requests to the slave from the plurality of masters;
- and
- cooperating with another arbitration apparatus which arbitrates a contention of data transfer on a second bus requested by the plurality of masters, and arbitrating the contention of the data transfer on a first bus requested by the plurality of masters,
- wherein the bus arbitration apparatus cooperates with the other bus arbitration apparatus which arbitrates the contention of data transfer in accordance with an in-order transfer requested by the one of the plurality of masters.
Dependencies are inferred from the claim text.