Digital interface which inserts a transfer rate value into a packet header and controls access to a bus based on a total transfer rate
First Claim
1. A digital interface device comprising:
- transmission and receiving means for transmitting transmission data to a bus by a predetermined data format, and for receiving transmitted data from the bus;
means for computing a first transfer rate of the transmission data;
means for inserting the first transfer rate into the transmission data and means for outputting the transmission data having the transfer rate onto the bus;
total transfer-rate computing means for receiving the first transfer rate, and based on the received first transfer rate, for computing a total transfer rate of data which are transmitted in multiplex on said bus; and
means for controlling bus usage right on the basis of the total transfer rate, including controlling usage right without initializing the bus network even if new equipment is additionally connected to the bus during data transmission through the bus.
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Accused Products
Abstract
A transfer-rate computing component computes a transfer rate of an output from a digital video tape recorder component to output the same through a packet conversion component. Child units, which are newly connected to a bus, output data of the transfer rate subsequent to a request command of a bus use right. A total transfer-rate computing component of a parent unit computes a total transfer rate of the data which are transmitted through the bus. An arbitration control part judges whether or not the total transfer rate exceed the maximum transfer rate which is set in the bus. Only when the total transfer rate does not exceed the maximum transfer rate, a command transmission component issues a bus use permission right, to accept the transmission of data from newly connected child units. In this manner, when a new unit or device is connected to the bus and also when connection of the bus is turned off, synchronous transfer is assured.
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Citations
15 Claims
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1. A digital interface device comprising:
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transmission and receiving means for transmitting transmission data to a bus by a predetermined data format, and for receiving transmitted data from the bus; means for computing a first transfer rate of the transmission data; means for inserting the first transfer rate into the transmission data and means for outputting the transmission data having the transfer rate onto the bus; total transfer-rate computing means for receiving the first transfer rate, and based on the received first transfer rate, for computing a total transfer rate of data which are transmitted in multiplex on said bus; and means for controlling bus usage right on the basis of the total transfer rate, including controlling usage right without initializing the bus network even if new equipment is additionally connected to the bus during data transmission through the bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A digital interface method comprising:
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fetching information corresponding to a transfer rate, from data on a bus in which a plurality of data are multiplexed upon each other and which are synchronously transferred by a predetermined synchronous transfer period; totaling the information corresponding to the fetched transfer rate, to compute information corresponding to a total transfer rate of data which are transmitted in multiplex on said bus; and giving a bus use permission right to a newly added unit according to an arbitration procedure only when the total transfer rate does not exceed the maximum transfer rate which is permitted to the bus if the new unit were additionally connected to the bus. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification