EMTG96 Datasheet, PDF (2/3 Pages) EM Microelectronic - MARIN SA – 96kB FLASH Memory Smart Card IC

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Introduction
The EMTG96-3G, also known as THESEUS™ Gold 96
3G, is a member of the Theseus family of devices
designed specifically for smart card applications. It is
software compatible with the industry standard 8051
micro-controller, to guarantee the maximum availability
of qualified software. The hardware implementation of
the core is a modern design not relying on microcode,
with an increase of up to 4 times on a standard 8051's
clocks per instruction.
Security of the family of devices makes them
particularly suitable in electronic commerce and
sensitive data areas. This is accomplished in hardware,
with not only protection against out of parameter
operation of the device, but hardware memory
management to protect against software security
attacks. The CPU clock is derived from its own internal
oscillator, so preventing attacks by clock manipulation,
or extrapolating program execution by monitoring
current variations on clock edges.
The need to support the emerging multifunction cards
requires that the device under software control can
download an application and run it when the device is
in the field embedded in a plastic card. This application
can be in the form of a script to be executed by an
interpreter or as a raw binary directly executed by the
processor. The device has to be protected against the
downloading of attack software designed to corrupt or
uncover the working or data contained in the device.
Traditionally this has been a software function, which
relies on the total integrity of the embedded software.
EMTG96-3G implements the first level of protection in
hardware. This maximises the security of the device,
and allows the reusability of developed certified code,
by isolating it from the actual hardware implementation
of the device. This protection mechanism allows for a
Secure Operating System to be embedded into the
device at manufacture, which has access rights to
features of the device that are denied to applications
that can be loaded into the device at manufacture or in
the field.
The Secure Operating System allocates to each
application programme, areas of the memory resources
of the device. The hardware then ensures that when
the application code is executing only accesses to
these designated spaces are made.
An extension of application mode has been developed
to facilitate Java Card virtual machine integration.
In systems where application isolation is not needed,
the security mechanism acts as a general protection
unit trapping software errors.
Theseus™ Gold 96 3G
EMTG96-3G
Serial interface
EMTG96-3G offers a unique serial interface compliant
with the ISO 7816-3 specification with several modes
implemented allowing serial connections at 9600 up to
357K bits per second at 3.57MHz. EMTG96-3G
supports T=0 asynchronous half duplex character
transmission protocol, T=1 asynchronous half duplex
block transmission and a proprietary T=14 protocol
used for fast loading of Code into the OTP by the card
manufacturer. It handles minimum guard time
requirements between characters specified by
ISO7816-3 specification automatically. The
THESEUS™ family is designed to be compatible with
the ISO7816-3 specification defining the characteristics
of Integrated Circuit Cards commonly referred to as
smart cards.
Random Number Generator
The on chip random number generator is fully Fips140-
1 compliant, providing a rapid stream of truly random
numbers. This allows use of the random numbers
generated beyond just the provision of numbers for
randomising transmissions or generating keys.
Clocks
EMTG96-3G has its own internal oscillator this allows
the core of the device to be independent of the external
clock. The processor can also be clocked much faster
than the IO CLK signal. This ensures the elimination of
fraudulent attacks involving frequency jitter and
unequal mark space ratios. The internal clock
generator is connected to the core via a divider that is
under the control of the software. This allows the
Operating System writer to control the trade off
between execution speed and power drawn by the
device. Extending battery life in hand help applications
where slow interfaces are involved.
Anti tampering
EMTG96-3G has extensive anti tampering provision
including the monitoring of the connection to the device
to ensure that deviations beyond a prescribed criteria
result in the device being closed down before its
operating conditions are violated.
On chip voltage regulators
Several on chip regulators isolate the various elements
of the device from variations and fluctuations in the
supply voltage. This allows elements to be
characterised precisely, as they operate at one fixed
voltage, which in turn maximises the endurance of the
device.
Copyright © 2005, EM Microelectronic-Marin SA
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