Control device
AssigneeHitachi, Ltd.
InventorsGoro Hamamoto, Tatsuyuki Ootani, Yutaka Uematsu, Jouji Matsushita
Life of this patent
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Abstract
Main wiring including a plurality of differential transmission lines for transmitting differential signals is formed on a motherboard. Termination resistors, provided at both ends of each of the plurality of differential transmission lines, connect the plurality of differential transmission lines to each other. A plurality of daughter boards are connected in parallel to each other via the main wiring. A line characteristic impedance of each differential transmission line is higher than a termination resistance value, which is a resistance value of the termination resistor.
Claims10
A control device comprising:
- a master board with a main wiring formed thereon, the main wiring including a plurality of differential transmission lines for transmitting differential signals;
- termination resistors provided at both ends of each of the plurality of differential transmission lines, the termination resistors connecting the plurality of differential transmission lines to each other;
- and
- a plurality of control boards connected in parallel to each other via the main wiring,
- wherein a characteristic impedance of each differential transmission line is higher than a termination resistance value that is a resistance value of the termination resistor, and
- wherein the characteristic impedance is higher than 100Ω.
A control device comprising:
- a master board with a main wiring formed thereon, the main wiring including a plurality of differential transmission lines for transmitting differential signals;
- termination resistors provided at both ends of each of the plurality of differential transmission lines, the termination resistors connecting the plurality of differential transmission lines to each other;
- and
- a plurality of control boards connected in parallel to each other via the main wiring,
- wherein a characteristic impedance of each differential transmission line is higher than a termination resistance value that is a resistance value of the termination resistor,
- wherein each control board includes:
- a communication unit that performs communication with the other control boards via the main wiring by using of a differential signal;
- an internal wiring that connects the communication unit and the main wiring;
- and a damping resistor provided on the internal wiring,
- wherein a damping resistance value, which is a resistance value of the damping resistor, is lower than ½ of the characteristic impedance, and
- wherein the communication unit performs communication in accordance with a multi low voltage differential signaling (MLVDS) system with a threshold voltage range from 50 mV to 150 mV.
Dependencies are inferred from the claim text.