ST7GEME4

ST7GEME4 implementation

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3.3

EMV versus PC/SC-ISO mode

The ST7GEME4 supports two operating modes:

●

An EMV mode, based on the EMV4.1 specifications

●

A PC/SC-ISO mode which allows to manage of a smartcard according to the PC/SC

and ISO 7816-3 standards

The default mode is PC/SC, however, the reader can switch between EMV and PC/SC-ISO

modes.

GemCore2000 is a utility in charge of managing the switching between the two modes.

When the utility is activated, the reader attempts EMV mode management whenever a

smartcard is inserted. If reading is successful, PC/SC mode will not be available.

Caution:

The activation of the GemCore2000 utility must be done before any card command. Any

activation of the GemCore2000 utility is not recommended unless the reader is reset.

The EMV mode fails if:

●

The smartcard has not sent an EMV-compliant answer to reset (ATR)

●

Negotiation of the buffer size with a T=1 card has failed

Using PC/SC-ISO mode with GemCore2000

The reader switches to PC/SC mode after the application or the driver has sent the

appropriate dedicated command to the reader (with a proprietary Escape command). In this

case, the reader remains in PC/SC mode as long as the card remains in the reader.

Whenever the EMV mode fails, the smartcard is powered off. After the host application has

sent the PC/SC switch (proprietary) Escape command, the application must send a new

Card Power On command.

When the reader deals with an EMV card, the data exchanged between the reader and the

host consists of short APDU messages. When the card is not EMV-compliant and the reader

is set to PC/SC-ISO mode, the reader exchanges TPDU messages with the host.

Restriction: character level and the extended APDU are not implemented in ST7GEME4

solution.

Table 3.

Technical features

Features

Description

Characteristics

Supported

smartcards

Asynchronous

– Microprocessor cards

– T=0, T=1 protocols

– Transmission rate: 2 Kbps to 344 Kbps

Synchronous

– Through a comprehensive API

Smartcard

electrical interface

Smartcard power supply

– 5V/55mA and 3V/50mA and 1.8V/20mA

– Short circuit current limitation

– Power up/power down control sequences

Smartcard management

– Card insertion/extraction detection

ESD protection on card I/O

– 4 kV Human Body Model