Emulator of contact type intelligent card with USB interface

Abstract

The invention discloses a simulator of contact intelligent card with USB interface, comprising a simulating chip and the supervising parts that controls the work of simulating chip. The simulator communicates with card reader through the USB interface, which has standard power line VDD and GND and signal line D+ and D-. The simulator has the own power source thereof which always supplies power to the simulating chip when the simulator is at work. User can control the simulator in the following ways: Control the connecting method of the signal line D+ and D- of USB interface with externally connected pull-up resistor through the supervising parts, and control the electrifying course of USB interface and its working mode of full speed or low speed. The supervising parts control the disconnecting of signal line D+ and D- of USB interface from the externally connected pull-up resistor and the pulling out course of simulating card from card reader. The invention can flexibly and conveniently set the connecting method of simulating chip's signal line D+ and D- with the external connected resistor by request, and simulate really the electrifying work course that is consistent with product and the regulation of agreement.

Description

technical field [0001] The invention relates to an emulator of a smart card, in particular to an emulator of a contact smart card with a USB interface. Background technique [0002] With the continuous promotion of smart card technology and the continuous improvement of the technical level, a series of contact smart card chips with USB interface have appeared in recent years, which are used in products such as USB electronic keys (KEY), and are widely used in banks. Online electronic banking and other services. This type of chip still belongs to the category of contact smart cards, but the interface with the card reader (generally a personal computer) is replaced by a USB interface from the traditional 7816 interface. see figure 2 , the USB interface of this type of chip must also conform to the USB protocol, and there are four standard VDD, GND, D+ and D- power and signal lines connected to the card reader 3 (see USB1.1 protocol). [0003] There is a contact smart card c...

AI Technical Summary

Problems solved by technology

The above two methods are inconsistent with the working process of the product chip. It is impossible to simulate the process of plugging in the card reader in the emulator, the card reader starts to provide power, and the user program in the emulation chip starts running immediately.

Moreover, since the external resistors on the signal lines D+ and D- of the emulation chip have been fixedly connected, it is impossible to control the start of the handshake process; it is necessary to switch the emulation chip between full-speed and low-speed operating modes, and only by reconnecting the emulation chip signal It is realized by connecting external resistors on lines D+ and D-; the USB interface has a hot-swap function, and the connection between the emulator and the card reader must be physically cut off to simulate the disconnection process between the card and the card reader

Images