Abstract: At startup, divided data blocks are received from other authentication devices and are assembled together with the local divided data block to reconstitute first authentication data. After a prescribed time interval, divided data blocks are again received from other authentication devices and are assembled together with the local divided data block to reconstitute second authentication data.

Abstract: A method and apparatus for communicating data between a device and a host apparatus through a USB interface detects and corrects USB transaction phase deviation due to erroneous recognition of handshake packets. A method comprises the steps of transmitting a first packet from the device to the host apparatus, the first packet being erroneously recognized by the host apparatus as a first type of packet, receiving a second packet from the host apparatus at the device in response to the first packet, and transmitting a third packet from the device to the host apparatus, the third packet being the first type of packet, in response to receiving the second packet from the host apparatus.

Abstract: At startup, divided data blocks are received from other authentication devices and are assembled together with the local divided data block to reconstitute first authentication data. After a prescribed time interval, divided data blocks are again received from other authentication devices and are assembled together with the local divided data block to reconstitute second authentication data.

Abstract: A method and apparatus for communicating data between a device and a host apparatus through a USB interface detects and corrects USB transaction phase deviation due to erroneous recognition of handshake packets. A method comprises the steps of transmitting a first packet from the device to the host apparatus, the first packet being erroneously recognized by the host apparatus as a first type of packet, receiving a second packet from the host apparatus at the device in response to the first packet, and transmitting a third packet from the device to the host apparatus, the third packet being the first type of packet, in response to receiving the second packet from the host apparatus.

Abstract: A method and apparatus for communicating data between a device and a host apparatus through a USB interface detects and corrects USB transaction phase deviation due to erroneous recognition of handshake packets. A method comprises the steps of transmitting a first packet from the device to the host apparatus, the first packet being erroneously recognized by the host apparatus as a first type of packet, receiving a second packet from the host apparatus at the device in response to the first packet, and transmitting a third packet from the device to the host apparatus, the third packet being the first type of packet, in response to receiving the second packet from the host apparatus.

Abstract: It is an object to provide a USB upstream device, a USB connector, and a USB cable, capable of operating stably by preventing malfunction due to a signal line defined as a high impedance state depending on a data transmission mode in the USB upstream device, when inserting or removing the USB upstream device into or from the USB. In a USP upstream device 1, a switch circuit 11 is provided between a signal line D? and grounding voltage. When the USB upstream device 1 is connected to the USB, power is supplied through VBUS line in the USB cable and the signal line D? is cut off from the grounding voltage. When cut off from the USB, the power supply through the VBUS line is cut off, and the switch circuit 11 conducts. Then, a discharge route is established. Unnecessary charge such as leak current or the like is discharged to the grounding voltage through the switch circuit 11. As a result, in a state separated from the USB, a voltage level of the signal line D? is maintained at a low voltage level.

Abstract: A method and apparatus for communicating data between a device and a host apparatus through a USB interface detects and corrects USB transaction phase deviation due to erroneous recognition of handshake packets. A method comprises the steps of transmitting a first packet from the device to the host apparatus, the first packet being erroneously recognized by the host apparatus as a first type of packet, receiving a second packet from the host apparatus at the device in response to the first packet, and transmitting a third packet from the device to the host apparatus, the third packet being the first type of packet, in response to receiving the second packet from the host apparatus.

Abstract: Wells of n- and p-type are formed in a p-type substrate. Wells of p-type are also formed in the n-type well. Both the p-type wells are formed by the same process at the same time to make MOS transistors have different threshold voltages. MOS transistors having a long gate length and a low threshold voltage are formed in the p-well in the n-well, and MOS transistors having a short gate length and a high threshold voltage are formed in the p-well at the outside of the n-well. Fuses are formed over the p-type wells in the n-type well at a high density.

Abstract: Wells of n- and p-type are formed in a p-type substrate. Wells of p-type are also formed in the n-type well. Both the p-type wells are formed by the same process at the same time to make MOS transistors have different threshold voltages. MOS transistors having a long gate length and a low threshold voltage are formed in the p-well in the n-well, and MOS transistors having a short gate length and a high threshold voltage are formed in the p-well at the outside of the n-well. Fuses are formed over the p-type wells in the n-type well at a high density.