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US 7,032,059 B1Granted
Method of data transmission management
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasazumi Yamada, Hiroyuki Iitsuka
Life of this patent
Estimating the term…
Abstract
In a bus system having a plurality of instruments linked to each other, the invention proposes a method which avoids useless data transmission or useless occupation of a data transmission line. A data transmission line is established for starting receipt/transmission of data after available instruments for the transmission/receipt of the date are identified. During the transmission of the data, the enable and disable state of transmission/receipt of the data is monitored and if desired, the data transmission is broken.
Claims45
A data transmission management method for use with an IEEE1394 bus system, comprising:
- providing said IEEE1394 bus system having a transmitter and a plurality of instruments linked to each other, the instruments including a target instrument, the target instrument having one or more input plugs for receiving data;
- inquiring from the transmitter, for transmitting data over the IEEE1394 bus system to each of the one or more input plugs of the target instrument, as to whether or not receipt of the data is enabled;
- receiving at the transmitter from the target instrument, a receiving state status response informing of an enable or disable state of receiving the data at each of the one or more the input plugs of the target insrument;
- and
- if the transmitter receives an enable state at one of the one or more input plugs of the target instrument, allowing the transmitter to establish a data transmission line between the transmitter and the one of the one or more input plugs of the target instrument.
2 more elements
A data transmission management method for use with an IEEE1394 bus system, comprising:
- providing an IEEE1394 bys system having a plurality of instruments linked to each other, the plurality of the instruments including a receiver for receiving data over the IEEE1394 bus system and a target instrument having one or more output plugs for outputting data over the IEEE1394 bus system;
- inquiring from the receiver, as to whether or not transmission of data is enabled at each of the one or more output plugs of the target instrument;
- receiving at the receiver a transmitting state response informing of an enable or disable state of transmitting the data at each of the one or more output plugs of the target instrument;
- and
- if the receiver receives an enable state from one of the one or more output plugs of the target instrument allowing the receiver to establish a data transmission line between the receiver and the one of the one or more output plugs of the target instrument.
2 more elements
A data transmission management method for use with an IEEE1394 bus system, comprising:
- providing an IEEE1394 bus system having a plurality of instruments linked to each other, the instruments including a first instrument, a second instrument, and a third instrument, the first instrument having one or more output plugs, the second instrument having one or more input plugs, the third instrument neither conducting transmission nor receipt of data;
- inquiring from the third instrument as to at least one of (i) whether or not the transmission of the data is enabled at each of the one or more output plugs of the first instrument and (ii) whether or not the receipt of the data is enabled at each of the one or more input plugs of the second instrument;
- receiving at the third instrument a transmitting state response from the first instrument informing of an enable or disable state of transmitting the data at each of the one or more output plugs of the first instrument;
- providing the third instrument with a receiving state response from the second instrument informing of an enable or disable state of receiving the data at each of the one or more input plugs of the second instrument;
- and
- if the third instrument receives an enable state of transmitting data at one of the one or more output plugs of the first instrument and an enable state of receiving data at the one of the one or more input plugs of the second instrument, allowing the third instrument to establish a data transmission line between the one of the one or more output plugs of the first instrument and the one of the one or more input plugs of the second instrument.
3 more elements
A data transmission management method for use with a bus system having a plurality of instruments linked to each other, comprising:
- inquiring from a transmitter, which is an instrument for transmitting data over the bus system, as to whether or not receipt of the data is enabled;
- receiving at the transmitter a receiving state status response informing of an enable or disable state of receiving the data;
- and
- allowing the transmitter to establish a data transmission line between the instruments according to the receiving state response,
- wherein the receiving state response includes a notice of a change of a signal format of data to be transmitted is changed.
2 more elements
A data transmission management method for use with a bus system having a plurality of instruments linked to each other, comprising:
- inquiring from a third instrument, which neither conducts transmission nor receipt of data, as to at least one of whether or not the transmission of the data is enabled and whether or not the receipt of the data is enabled;
- providing the third instrument with both a transmitting state response and a receiving state response of the target instruments informing of an enable or disable state of transmitting the data and of an enable or disable state of receiving the data respectively;
- and
- allowing the third instrument to establish or break a data transmission line between the instrument delivering the transmitting state response and the instrument delivering the receiving state response, according to the transmitting or receiving state response,
- wherein when receiving the transmitting state response indicating that the transmission of the data is ready earlier than the receiving state response indicating that the receipt of the data is ready, and
- the third instrument examines whether the target instrument which delivers the transmitting status response is ready or not for transmission of the data, before establishing the data transmission line.
3 more elements
A data transmission management method for use with a bus system having a plurality of instruments linked to each other, comprising:
- inquiring from a third instrument, which neither conducts transmission nor receipt of data, as to at least one of whether or not the transmission of the data is enabled and whether or not the receipt of the data is enabled;
- providing the third instrument with both a transmitting state response and a receiving state response of the target instruments informing of an enable or disable state of transmitting the data and of an enable or disable state of receiving the data respectively;
- and
- allowing the third instrument to establish or break a data transmission line between the instrument delivering the transmitting state response and the instrument delivering the receiving state response, according to the transmitting or receiving state response,
- wherein when receiving the receiving state response indicating that the receipt of the data is ready earlier than the transmitting state response indicating that the transmission of the data is ready, and
- the third instrument examines whether the target instrument which delivers the receiving status response is ready or not for receipt of the data, before establishing the data transmission line.
3 more elements
A data transmission management method for use with a bus system having a plurality of instruments linked to each other, comprising:
- inquiring from a third instrument, which neither conducts transmission nor receipt of data, as to at least one of whether or not the transmission of the data is enabled and whether or not the receipt of the data is enabled;
- providing the third instrument with both a transmitting state response and a receiving state response of the target instruments informing of an enable or disable state of transmitting the data and of an enable or disable state of receiving the data respectively;
- and
- allowing the third instrument to establish or break a data transmission line between the instrument delivering the transmitting state response and the instrument delivering the receiving state response, according to the transmitting or receiving state response,
- wherein the receiving state response includes a notice of a change of a signal format of data to be transmitted, and
- the transmitting state response includes one of an enable or disable state for transmitting the data and a change in the enable or disable state.
3 more elements
Dependencies are inferred from the claim text.