The latest USB 3.0

Published:2011/8/25 2:41:00 Author:Phyllis From:SeekIC

Nowadays we can rarely find a PS/2 keyboard or mouse on a laptop as more and more people use flexible USB keyboards and mice. USB has successfully created its own market space by replacing PS/2, UART and parallel port.

Besides in consumer electronics devices, USB is also used in image sensing applications like cameras, biometric applications like fingerprint-based USB drives, fingerprint desktop authentication, and user finger print enrollment.

Before the advent of USB 3.0, USB 2.0 was the latest. The physical signaling rates of USB 2.0 are 1.5 Mbits/s at Low Speed, 12 Mbits/s at Full Speed and 480 Mbits/s at High Speed. Compared with USB 2.0, USB 3.0 increases the physical signaling rate of up to 5 Gbit/s and decreases the power consumption for more power output. The USB 3.0 standard supports backwards compatible by implementing the USB 2.0 bus in parallel with the USB 3.0 bus.

In order to achieve smooth uninterrupted video effect, the USB 2.0 specification support a dedicated bandwidth of 24 Mbytes/s via isochronous transfer which can provide higher throughput in excess of 40 Mbytes/sec based on factors like system bandwidth allocation for the USB Host Controller, operation system overhead, the presence of other USB devices, and so on.

USB is being widely integrated into webcams and biometric applications. Webcams and PC cameras are used to create a visual revolution for both business and personal purposes by users worldwide.

Biometric applications contain methods for uniquely recognizing individuals based upon one or more intrinsic physical or behavioral traits. The increasing focus of securing access control has led to a huge growth in the area of biometrics.

The physical traits include fingerprint, face, iris, and palm. There are two modes in which a biometric system operates: the verification mode and the identification mode. In the verification mode, the system makes a one-to-one comparison of the scanned template with the stored template. While in identification mode, the system performs one-to-many comparisons with the stored template in the biometric database.

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