ST22T064-A datasheet(3/7 Pages) STMICROELECTRONICS

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ST22T064-A

DESCRIPTION

The ST22T064-A is a member of the SmartJ™

platform using a 32-bit Reduced Instruction Set

Computer (RISC) core to execute both Native

RISC instructions and JavaCard™ 2.x Technolo-

gy instruction (byte codes) directly (See Figure 2.

"SmartJ™ Platform EEPROM Architecture", on

page 3).

Direct JavaCard™ byte code execution provides

high performance advantage over processors that

emulate the JavaCard™ byte code instruction set.

The USB 2.0 full speed device controller allows

communication up to 12Mbits/s. The interface fea-

tures 16 configurable endpoints and supports con-

trol, bulk, interrupt and isochronous transfer

modes. This makes the ST22T064-A suitable for

PC and network access control as well as multi-

media applications such as secure multimedia

content broadcast. The clock recovery eliminates

the need for crystals or other external circuitry,

thus allowing cost effective USB token design.

Memory and Peripheral accesses are controlled

by a Memory Protection Unit that allows to imple-

ment firewalls between applications.

Memories are accessed via two different buses,

allowing simultaneous accesses to code and data.

Memory load and stores can be performed at byte,

short (2-bytes), or word (4-bytes) granularity, with

optional pointer auto increment.

The ST22 core includes dedicated instructions to

accelerate performances of the following algoriths:

–

DES and Triple DES

–

Modular Arithmetic on big numbers,

–

Characteristic two field arithmetic to support

efficiently Elliptic Curves,

–

CRC 16-bit ISO 3309.

Cryptography performance can be increased for

DES thanks to a dedicated DES / Triple DES ac-

celerator.

The product has clock and power management, 2

User configurable Timers, a Central Interrupt Con-

troller and a Random Number Generator.

Figure 2. SmartJ™ Platform EEPROM Architecture

POWER MANAGEMENT

32-bit

RISC

CORE

CLOCK MANAGEMENT

MPU

RAM

BUS 1

BUS 2

PERIPHERALS

ISO

ROM

EEPROM

7816

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