ST7GEME4 implementation

ST7GEME4

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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

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

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Compatibility with T=0 and T=1 protocols

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Compatibility with EMV and PC/SC modes.

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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.