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ST7GEME4 Folha de dados(PDF) 10 Page - STMicroelectronics |
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ST7GEME4 Folha de dados(HTML) 10 Page - STMicroelectronics |
10 / 28 page ST7GEME4 implementation ST7GEME4 10/28 3 ST7GEME4 implementation The ST7GEME4 has been developed to offer a complete ready-to-use firmware solution which allows fast development and rapid time-to-market of smartcard reader applications. It offers a single IC solution and simplifies the integration of smartcard interfaces into electronic devices such as computers, POS terminals, mobile phones, PDAs, home routers, and set-top boxes. Pre-programmed with communication software from our partner GEMPLUS, the ST7GEME4 is a complete firmware solution controlling the communication between ISO 7816 1-2-3-4 cards and a host system. An evaluation kit and reference design with a complete bill of materials and PCB recommendations are available. The ST7GEME4 complies with EMVCo/EMV2000 standards. Software support and engineering expertise in system integration and PCB design are available as additional services. 3.1 Functionality The core functionality of ST7GEME4 resides in its pre-programmed software embedded in ROM memory. GemCoreTM technology manages the communication protocol to/from the host computer and the external card. Basic features and compliance are described in the features section and in Table 3 on page 11. A dedicated analog block provides smartcard power supplies 1.8 V, 3 V, and 5 V necessary to interface with different card voltages available on the market. Voltages are selected by software. External LEDs can also be directly connected to dedicated I/Os. A dedicated UART interface provides an ISO 7816 communication port for connection with the smartcard connector. A full-speed USB interface port allows external connection to a host computer. An optional RS232 connection is also available on dedicated I/Os. 3.2 Smartcard interface features The ST7GEME4 firmware includes the following features: ● Compatibility with asynchronous cards ● Compatibility with T=0 and T=1 protocols ● Compatibility with EMV and PC/SC modes. ● Compatibility with ISO 7816-3 and 4 and ability to supply the cards with 5V, 3V or 1.8V (class A, B or C cards, respectively) ● Resume/wake-up mode upon smartcard insertion/removal Further details on smartcard management can be found in "Gemcore USB Pro reference manual" from Gemplus. The reader is able to communicate with smartcards up to the maximum baud rate allowed, namely 344 086 bps (TA1=16) for a clock frequency of 4 MHz. Because the size of the smartcard buffer is 261 bytes, care must be taken not to exceed this size during APDU exchanges when the protocol in use is T=1. |
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