公开(公告)号：US06223298B1

公开(公告)日：2001-04-24

申请号：US09208777

申请日：1998-12-10

申请人： Vincent Tellier ,  Michel Talaga ,  Daniel Deroo

发明人： Vincent Tellier ,  Michel Talaga ,  Daniel Deroo

IPC分类号： G06F108

CPC分类号： G06K7/0086 ,  G06K7/0008 ,  G06K7/0013

摘要： The communications interface enables a processor unit to dialog with an IC card having an elementary time unit (ETU) for transmitting one bit that is equal to (K/Fs). The IC card includes a microprocessor, a clock pin for application of an external clock signal enabling the microprocessor of the IC card to be clocked, and an I/O pin. The microprocessor receives external data or transmits data via the I/O pin. The communications interface includes a serial communications line for interchanging data with the IC card via the I/O pin. The communications interface also includes a transmitting module, which is written-addressable by the processor unit and includes a serialization module for serializing and transmitting, over the serial communications line, data received from the processor unit. The communications interface also includes a receiving module, which is read-addressable by the processor unit and includes a serialization module for serializing data received over the serial communications line. The communications interface also includes a first clock signal having an adjustable frequency and a second clock signal which is synchronous with the first clock signal and which enables the serialization modules of the transmitting and receiving modules to be clocked. The frequency ratio between the first clock signal and the second clock signal is preferably equal to the factor (K).

摘要翻译： 通信接口使得处理器单元能够与具有用于发送等于（K / Fs）的一位的基本时间单位（ETU）的IC卡对话。 IC卡包括微处理器，用于施加外部时钟信号的时钟引脚，使IC卡的微处理器能够被计时，以及I / O引脚。 微处理器通过I / O引脚接收外部数据或发送数据。 通信接口包括用于通过I / O引脚与IC卡交换数据的串行通信线路。 通信接口还包括发送模块，该发送模块可由处理器单元写写，并且包括用于通过串行通信线路串行化和发送从处理器单元接收的数据的串行化模块。 通信接口还包括接收模块，该接收模块可由处理器单元读取，并且包括用于串行化串行通信线路上接收的数据的串行化模块。 通信接口还包括具有可调频率的第一时钟信号和与第一时钟信号同步的第二时钟信号，并且使得发送和接收模块的串行化模块能够被计时。 第一时钟信号和第二时钟信号之间的频率比优选等于因子（K）。