Interface device for SIM card and USIM card

Abstract

The disclosed interface device for SIM and USIM comprises: a bus interface module, a register module, an interruption-handling module, a clock generation module, a state machine module, a transmit-receive module, a card detection module, and a power supply module. Wherein, there are bus clock signal (pclk), bus chip-selection signal (p_cs), bus address line (paddr), and card power on-off control signal (sc_pwctrl). This invention expands SIM card from 2G times to the 3G times as USIM card, reduces cost and consumption, and prolongs mobilephone standby time.

Description

technical field [0001] The invention relates to an interface device in the field of mobile communication, in particular to an interface device for SIM cards and USIM cards of GSM / GPRS mobile terminals and WCDMA mobile terminals. Background technique [0002] In the development history of mobile communication, the 2G era has realized the separation of machine and card of great significance. A SIM card uniquely identifies a customer, and a SIM card can be inserted into any GSM mobile phone for use. The SIM card can safely store user personal data. Information, users can only obtain network resources and enjoy network services through SIM cards; in the coming 3G era, in order to meet the needs of multiple services, USIM cards will be widely used instead of SIM cards. USIM cards are more powerful. It not only supports SIM Card-defined functions, it also supports a variety of non-telecom applications or telecom value-added applications, and each application can follow its own ind...

AI Technical Summary

Problems solved by technology

[0005] On the one hand, the SIM card interface cannot be used for the USIM card interface, and vice versa, that is, the poor versatility increases the development cost of the mobile phone

At present, the SIM card interface device usually adopts the byte transmission protocol, which transmits one byte at a time. The interface voltage provided by the SIM card interface device is 5v or 3.3v, while the USIM card can adopt the character block transmission protocol, which can transmit multiple bytes at a time. byte, the interface voltage can be 3.3v or 1.8v, due to the difference in transmission protocol, the current SIM card interface device cannot be used for USIM card

[0006] On the other hand, the energy consumption is high, because the information exchange between the mobile phone and the card is intermittent. When there is no information exchange, the card should be in an energy-saving state. The current SIM card interface device cannot do this

[0007] The current SIM card interface can only transmit data in bytes, which has low transmission efficiency and cannot fully meet the requirements of 3G. In addition, when there are many transmission errors between the interface device and the card, the current SIM card interface can only be reset by cold reset. method to re-activate the sequence. This error recovery method takes a long time and cannot achieve the purpose of quickly recovering errors.

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