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ST19XT34

HARDWARE DESCRIPTION

This ST19XT34, a member of the ST19X platform,

is a serial access microcontroller especially de-

signed for very large volume and cost effective se-

cure portable applications.

The chip includes also a MAP which is based on a

1088 bits processor architecture. It processes

modular multiplication, squaring and additional

calculations up to 2176 bit operands.

Internal Modular Arithmetic Processor (MAP) and

DES accelerator are designed to speed up crypto-

graphic calculations using Public Key Algorithms

and Secret Key Algorithms.

This product is based on a STMicrolectronics 8 bit

CPU and includes on chip memories: User ROM,

User RAM and User EEPROM with state of the art

security features.

ROM, RAM and EEPROM memories can be con-

figured into partitions with customized access

rules.

Access from any memory area to another are pro-

tected by hardware FIREWALLS. Access rules are

User defined and can be selected by mask options

or during the life of the product.

The chip includes a DES accelerator which is ac-

cessible via cryptographic system ROM software

library.

As with all the other ST19X products, serial inter-

faces fully compatible with the ISO7816 standard

for Smartcard applications are available.

In addition, the chip includes an 2.0 standard USB

serial interface and 2 serial access ISO7816-3

I/Os.

A CRC calculation block is also available and is di-

rectly accessible by the User.

This product is manufactured using an advanced

highly reliable ST CMOS EEPROM technology.

Figure 2. Block Diagram

INTERNAL BUS

MEMORY ACCESS FIREWALL

I/O

2 X

SERIAL

INTER-

FACE

GND

8 BIT

CPU

3 X

8 BIT

TIMERS

CRC

MODULE

CLK

CLOCK

GENE-

RATOR

MODULE

Vcc

GUN A

&

GUN B

SYSTEM ROM, MAP and DES FIREWALL

RAM

USER ROM

SYSTEM ROM

and CRYPTO

LIBRARIES

DES

ACCELE-

RATOR

MAP

290

SECU-

RITY

ADMIN.

RESET

USB

INTER-

FACE

EEPROM

D+

D-