MEANS FOR COMMUNICATING WITH USB SMART CARDS USING FULL-SPEED OR HIGH-SPEED TRANSFERS
First Claim
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1. A smart card that is capable of communicating with a host in a universal serial bus (USB) standard protocol via a USB-compatible cable terminating in card reader/connector head, the card comprising:
- a first contact point on the card that receives power signal from the host;
a second contact point one the card that connects to a ground;
third and fourth contact points on the card that cooperate to send and receive differential data signals;
a chip module on the card that receives power and ground from said first and second contact points and sends and receives USB compatible data signals through said third and fourth contact points; and
a clock module mounted on the card, the clock module having an accuracy sufficient to clock at least full speed data transfer of USB signals with any compatible host without regard to the type of reader/connector to which the card is connected.
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Abstract
The present invention allows the use of low speed USB reader/connector to be use for full speed and high-speed transmission by introducing an accurate clock element into the smart card. In addition, the present invention eliminate the need of having a clock element in any USB compatible reader/connector, making the reader/connector a much simpler device that can be manufactured in a lower cost.
24 Citations
7 Claims
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1. A smart card that is capable of communicating with a host in a universal serial bus (USB) standard protocol via a USB-compatible cable terminating in card reader/connector head, the card comprising:
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a first contact point on the card that receives power signal from the host;
a second contact point one the card that connects to a ground;
third and fourth contact points on the card that cooperate to send and receive differential data signals;
a chip module on the card that receives power and ground from said first and second contact points and sends and receives USB compatible data signals through said third and fourth contact points; and
a clock module mounted on the card, the clock module having an accuracy sufficient to clock at least full speed data transfer of USB signals with any compatible host without regard to the type of reader/connector to which the card is connected. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification