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US 8,543,171 B2Granted
Data transmission circuit and its control method
AssigneeFujitsu Semiconductor Limited
InventorsMasato Tomita, Takashi Shimizu, Hideaki Watanabe
Life of this patent
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Abstract
A data transmission circuit transmitting an activation signal prior to a data signal through a signal transmission line, including: an activation detection signal generation unit for generating an activation detection signal by detecting the activation signal; and a wakeup signal generation unit for being activated by the activation detection signal, and generating a wakeup signal by detecting that the activation signal is transmitted for a predetermined time.
Claims13
A data transmission circuit, comprising:
- an activation detection signal generation unit for detecting an activation signal indicative of a data signal being transmitted through a signal transmission line, and generating an activation detection signal;
- and
- a wakeup signal generation unit for receiving the generated activation detection signal, and generating a wakeup signal by detecting that the activation signal is transmitted for a predetermined time,
- wherein the activation signal comprises a differential signal, and
- the activation detection signal generation unit comprises:
- a level shift unit for shifting a signal level of each of a plurality of signals configuring the differential signal to a predetermined level;
- and
- a comparison unit for comparing the activation signal shifted by the level shift unit to the predetermined level with a reference voltage.
5 more elements
A method, comprising:
- detecting an activation signal indicative of a data signal being transmitted through a signal transmission line, wherein the activation signal comprises a differential signal;
- generating an activation detection signal in response to the detected activation signal, comprising:
- shifting a signal level of each of a plurality of signals configuring the differential signal to a predetermined level, and
- comparing the activation signal shifted to the predetermined level with a reference voltage;
- and
- generating a wakeup signal by receiving the generated activation detection signal and detecting that the activation signal is transmitted for a predetermined time.
3 more elements
Dependencies are inferred from the claim text.