Initializing method and data transmitter
First Claim
1. An initialization method for use in a ring-shaped network comprising a plurality of stages of data transmission apparatuses, each performing data transmission while assigning one or more bits of data as one data symbol to a signal level, one data transmission apparatus being a master data transmission apparatus, any remaining data transmission apparatuses being slave data transmission apparatuses, said initialization method comprising:
- outputting a first initialization pattern signal from the master data transmission apparatus to a slave data transmission apparatus in a next stage upon turn-on of power or immediately after reset;
establishing clock synchronization via the next-stage slave data transmission apparatus upon receipt of the first initialization pattern signal;
outputting the first initialization pattern signal from the next-state slave data transmission to a slave data transmission apparatus in the following stage when clock synchronization is established;
outputting a second initialization pattern signal from the master data transmission apparatus to the next-stage slave data transmission apparatus after outputting the first initialization pattern signal;
setting an evaluation level for each signal level via the next-stage slave data transmission apparatus when the next-stage slave data transmission apparatus receives the second initialization pattern signal;
outputting the second initialization pattern signal from the next-stage slave data transmission apparatus to the slave data transmission apparatus in the following stage; and
starting transmission/reception of data in the data transmission apparatuses connected in the ring-shaped network after establishing the evaluation levels.
1 Assignment
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Accused Products
Abstract
A first initialization pattern signal is a signal in which a maximum signal level and a minimum signal level appear alternately, and a second initialization pattern signal is a signal in which all signal levels appear in a predetermined arrangement. In a ring-shaped network including plural stages of data transmission apparatuses (100), a transmission unit (110) of each data transmission apparatus outputs the first initialization pattern signal successively to a next-stage data transmission apparatus at turn-on of power or immediately after reset, and a reception unit (120) establishes clock synchronization on the basis of the first initialization pattern signal received. When synchronization is established in all of the data transmission apparatuses, the transmission unit (110) outputs the second initialization pattern signal successively to the next-stage data transmission apparatus, and the reception unit (120) sets evaluation levels for the respective signal levels on the basis of the received second initialization pattern signal, and transmission/reception of data is started when evaluation levels are set in all of the data transmission apparatuses.
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Citations
7 Claims
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1. An initialization method for use in a ring-shaped network comprising a plurality of stages of data transmission apparatuses, each performing data transmission while assigning one or more bits of data as one data symbol to a signal level, one data transmission apparatus being a master data transmission apparatus, any remaining data transmission apparatuses being slave data transmission apparatuses, said initialization method comprising:
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outputting a first initialization pattern signal from the master data transmission apparatus to a slave data transmission apparatus in a next stage upon turn-on of power or immediately after reset; establishing clock synchronization via the next-stage slave data transmission apparatus upon receipt of the first initialization pattern signal; outputting the first initialization pattern signal from the next-state slave data transmission to a slave data transmission apparatus in the following stage when clock synchronization is established; outputting a second initialization pattern signal from the master data transmission apparatus to the next-stage slave data transmission apparatus after outputting the first initialization pattern signal; setting an evaluation level for each signal level via the next-stage slave data transmission apparatus when the next-stage slave data transmission apparatus receives the second initialization pattern signal; outputting the second initialization pattern signal from the next-stage slave data transmission apparatus to the slave data transmission apparatus in the following stage; and starting transmission/reception of data in the data transmission apparatuses connected in the ring-shaped network after establishing the evaluation levels. - View Dependent Claims (2, 3, 4)
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5. A data transmission apparatus which is connected in a ring-shaped network, and is operable to perform data transmission while assigning one or more bits of data as one data symbol to a signal level, said data transmission apparatus comprising:
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a first initialization pattern output unit operable to output a first initialization pattern signal for establishing clock synchronization to a data transmission apparatus connected in a next stage of the ring-shaped network; a second initialization pattern output unit operable to output a second initialization pattern signal for setting an evaluation level by which the signal level is subjected to threshold evaluation, to the data transmission apparatus connected in the next stage of the ring-shaped network; and a synchronization establishment unit operable to receive the first initialization pattern signal transmitted from a data transmission apparatus connected in a previous stage of the ring-shaped network, and to perform clock reproduction to establish synchronization, wherein said data transmission apparatus is operable to start transmitting/receiving data after synchronization is established on receipt of the first initialization pattern signal, and wherein said data transmission apparatus is operable to set evaluation levels of data upon receipt of the second initialization pattern signal. - View Dependent Claims (6, 7)
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Specification