Ring network and data transmitter
First Claim
1. (Amended) A ring-shaped network in which plural data transmission apparatuses, each performing data transmission while assigning one or more bits of data as one data symbol to a signal level, are connected via a transmission path, wherein one of the data transmission apparatuses is a master data transmission apparatus, while the other data transmission apparatuses are slave data transmission apparatuses;
- each of the data transmission apparatuses is connected with a device which is supplied with data received by the data transmission apparatus, and outputs a result of processing to the data transmission apparatus;
at turn-on of power or immediately after reset, the master data transmission apparatus outputs the data supplied from the connected device, to the transmission path;
each of the slave data transmission apparatuses receives, from the transmission path, the data outputted from the data transmission apparatus connected in the previous stage, establishes clock synchronization, outputs the received data to the connected device, and resends the received data to the transmission path; and
the slave data transmission apparatus outputs the data supplied from the connected device, to the transmission path, after synchronization of the connected device is established.
1 Assignment
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Accused Products
Abstract
It is an object to provide a ring-shaped network which can speedily perform initialization even when a plurality of data transmission apparatuses, each performing multi-valued transmission while assigning one or more bits of data as one data symbol to a signal level, are connected thereto, and a data transmission apparatus.
The data transmission apparatus outputs received data to a device connected thereto while performing establishment of clock synchronization on the basis of the received data, and when synchronization is established, it resends the received data. On the other hand, when synchronization of the connected device is established, it sends data supplied from the connected device. Further, in the ring-shaped network, a master data transmission apparatus outputs data at turn-on of power or immediately after reset, and a next-stage slave data transmission apparatus receives the data to establish synchronization, and resends the received data when synchronization is established. Thus, synchronization of all the data transmission apparatuses is established while making a round of this data, and then synchronization of devices connected to the respective data transmission apparatuses is established.
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Citations
7 Claims
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1. (Amended) A ring-shaped network in which plural data transmission apparatuses, each performing data transmission while assigning one or more bits of data as one data symbol to a signal level, are connected via a transmission path, wherein
one of the data transmission apparatuses is a master data transmission apparatus, while the other data transmission apparatuses are slave data transmission apparatuses; -
each of the data transmission apparatuses is connected with a device which is supplied with data received by the data transmission apparatus, and outputs a result of processing to the data transmission apparatus;
at turn-on of power or immediately after reset, the master data transmission apparatus outputs the data supplied from the connected device, to the transmission path;
each of the slave data transmission apparatuses receives, from the transmission path, the data outputted from the data transmission apparatus connected in the previous stage, establishes clock synchronization, outputs the received data to the connected device, and resends the received data to the transmission path; and
the slave data transmission apparatus outputs the data supplied from the connected device, to the transmission path, after synchronization of the connected device is established. - View Dependent Claims (2)
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3. A data transmission apparatus which is connected to a ring-shaped network via a transmission path, and performs data transmission while assigning one or more bits of data as one data symbol to a signal level;
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said data transmission apparatuses being connected with a device which is supplied with data received by the data transmission apparatus, and outputs a result of processing to the data transmission apparatus; and
said data transmission apparatus including;
a synchronization detector for establishing synchronization on the basis of the data inputted through the transmission path, and performing reproduction of a data clock;
a connected device synchronization detector for detecting that synchronization of the connected device is established; and
a selector for switching data to be transmitted to the transmission path between the data received through the transmission path and the data supplied from the connected device. - View Dependent Claims (4, 5, 6, 7)
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Specification