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HARDWARE DESCRIPTION

The ST19XG34, a member of the ST19 platform,

is a serial access microcontroller especially de-

signed for very large volume and cost effective se-

cure portable applications.

The ST19XG34 is based on a STMicrolectronics 8

bit CPU and includes on chip memories: 70 K

User ROM, 2016-byte User RAM and 34K User

EEPROM with state of the art security features.

ROM, RAM and EEPROM memories can be con-

figured into partitions with customized access

rules.

Figure 2 Block diagram

Access from any memory area to another are pro-

tected by hardware FIREWALLS. Access rules

are User defined and can be selected by mask op-

tions or during the life of the product.

The chip includes a DES accelerator which is ac-

cessible via a cryptographic system ROM soft-

ware library.

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.

As with all the other ST19 products, it is fully com-

patible with the ISO7816 standard for Smartcard

applications.

SOFTWARE DEVELOPMENT

Software development and firmware (ROM code/

options) generation are done with the ST19-HDSX

development system, on Windows NT and Win-

dows 98. Powerfull C/C++ compiler, debugger

and simulator are also available.

SYMMETRICAL ALGORITHMS:

– DES, triple DES, DESX computations

– CBC chaining mode

– Loading / Unloadings from / to registers are se-

cured against SPA

SYSTEM

ROM

LIBRARIES

CRYPTO

AND

SCP 155a/DS

INTERNAL BUS

RESET

SYSTEM

ROM

FIREWALL

MEMORY ACCESS FIREWALL

CLK

I/O

GND

Vcc

RAM

Bytes

2016

EEPROM

34K bytes

USER ROM

70K bytes

SYSTEM

ROM

SERIAL

I/O

INTER-

FACE

8 BIT

CPU

3 X

8 BIT

TIMERS

CLOCK

GENERA-

TOR

MODULE

SECURITY

ADMINISTRATOR

DES

ACCE

LERATOR

GUN A

&

GUN B

CRC

MODULE