Communication control device and method
AssigneeSony Corporation
InventorHajime Hata
Life of this patent
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Abstract
A communication control device includes a determination circuit for determining whether reception of an asynchronous packet from an IEEE 1394 serial bus is allowed or denied by comparing the sum of the size of the asynchronous packet to be received and the size of packets currently stored in a receive FIFO unit with the size of packets which can be stored in the receive FIFO unit. The communication control device further includes an acknowledge generating circuit for generating an acknowledge signal asserting whether reception of the asynchronous packet is allowed or denied based on the determination result of the determination circuit, and the generated acknowledge signal is sent back to the IEEE 1394 serial bus.
Claims10
A communication control device including asynchronous packet receiving means for receiving an asynchronous packet from communication means, and a receive FIFO unit for receiving and storing the asynchronous packet received by said asynchronous packet receiving means, said communication control device comprising:
- control means for controlling whether or not the asynchronous packet received by said asynchronous packet receiving means is to be stored in the receive FIFO unit;
- storage size setting means for setting a packet-storage size in the receive FIFO unit;
- determination means for determining whether reception of an asynchronous packet that is to be received by said asynchronous packet receiving means is allowed or denied by comparing the sum of the size of the asynchronous packet to be received and the size of packets currently stored in the receive FIFO unit with the size set by said storage size setting means;
- and
- acknowledge generating means for generating an acknowledge signal asserting whether reception of the asynchronous packet, which is to be received, is allowed or denied based on the determination result of said determination means,
- wherein the acknowledge signal generated by said acknowledge generating means is sent back to the communication means.
A communication control method for a communication control device including asynchronous packet receiving means for receiving an asynchronous packet from communication means, and a receive FIFO unit for receiving and storing the asynchronous packet received by the asynchronous packet receiving means, said communication control method comprising the steps of:
- controlling whether or not the asynchronous packet received by the asynchronous packet receiving means is to be stored in the receive FIFO unit;
- setting a packet-storage size in the receive FIFO unit;
- determining whether reception of an asynchronous packet that is to be received by the asynchronous packet receiving means is allowed or denied by comparing the sum of the size of the asynchronous packet to be received and the size of packets currently stored in the receive FIFO unit with the set storage size;
- and
- generating an acknowledge signal asserting whether reception of the asynchronous packet, which is to be received, is allowed or denied based on the determination result obtained in the determining step,
- wherein the generated acknowledge signal is sent back to the communication means.
Dependencies are inferred from the claim text.