ST19WL34, ST19WL66

2/3

HARDWARE DESCRIPTION

The product, member of the ST19W platform, is a

serial access microcontroller specially designed

for cost effective secure portable applications.

It is manufactured using an advanced highly reli-

able ST CMOS EEPROM technology.

It is based on a STMicroelectronics 8 bit CPU and

includes on-chip memories: User ROM, User RAM

and EEPROM with state of the art security fea-

tures. ROM, RAM and EEPROM memories can be

configured into partitions with customized access

rules.

An additional ST ROM contains all ST provided

functions and libraries.

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 an Enhanced DES accelerator

which is accessible via cryptographic software li-

braries located in ST ROM.

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

enhanced DES accelerator are designed to speed

up cryptographic calculations using Public Key Al-

gorithms and Secret Key Algorithms.

As with all the other ST19W products, a serial in-

terface fully compatible with the ISO7816 standard

for Smartcard applications is available.

A CRC calculation block is also available and is di-

rectly accessible by the User.

Figure 2. Block Diagram

SOFTWARE DEVELOPMENT

Software development and firmware (ROM code/options) generation are done with the ST19-HDSX de-

velopment system on Windows NT, Windows 98 and Windows 2000.

Powerful C/C++ compiler, debugger and simulator are also available.

INTERNAL BUS

MEMORY ACCESS FIREWALL

I/O

1 SERIAL

I/O

INTER-

FACE

GND

8 BIT

CPU

3 X

8 BIT

TIMERS

CRC

MODULE

CLK

CLOCK

GENE-

RATOR

MODULE

ST ROM, MAP and EDES FIREWALL

RAM

USER ROM

ST ROM

and CRYPTO

LIBRARY

EDES

ACCELE-

RATOR

MAP

432

Vcc

GUN A

&

GUN B

SECU-

RITY

ADMIN.

RESET

EEPROM