SX28AC75-ISLASHTQ datasheet(4/52 Pages) ETC

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1.3

Architecture

The SX devices use a modified Harvard architecture.

This architecture uses two separate memories with sepa-

rate address buses, one for the program and one for

data, while allowing transfer of data from program mem-

ory to SRAM. This ability allows accessing data tables

from program memory. The advantage of this architec-

ture is that instruction fetch and memory transfers can be

overlapped with a multi-stage pipeline, which means the

next instruction can be fetched from program memory

while the current instruction is being executed using data

from the data memory.

Scenix has developed a revolutionary RISC-based archi-

tecture and memory design techniques that is 20 times

faster than conventional MCUs, deterministic, jitter free,

and totally reprogramable.

The SX family implements a four-stage pipeline (fetch,

decode, execute, and write back), which results in execu-

tion of one instruction per clock cycle. For example, at

the maximum operating frequency of 50 MHz, instruc-

tions are executed at the rate of one per 20-ns clock

cycle.

1.3.1 The Virtual Peripheral Concept

Virtual Peripheral concept enables the “software system

on a chip” approach. Virtual Peripheral, a software mod-

ule that replaces a traditional hardware peripheral, takes

advantage of the Scenix architecture’s high performance

and deterministic nature to produce same results as the

hardware peripheral with much greater flexibility.

The speed and flexibility of the Scenix architecture com-

plemented with the availability of the Virtual Peripheral

library, simultaneously address a wide range of engineer-

ing and product development concerns. They decrease

the product development cycle dramatically, shortening

time to production to as little as a few days.

Scenix’s time-saving Virtual Peripheral library gives the

system designers a choice of ready-made solutions, or a

head start on developing their own peripherals. So, with

Virtual Peripheral modules handling established func-

tions, design engineers can concentrate on adding value

to other areas of the application.

The concept of Virtual Peripheral combined with in-sys-

tem re-programmability provides a power development

platform ideal for the communications industry because

of the numerous and rapidly evolving standards and pro-

tocols.

Overall, the concept of Virtual Peripheral provides bene-

fits such as using a more simple device, reduced compo-

nent count, fast time to market, increased flexibility in

design, customization to your application, and ultimately

overall system cost reduction.

Some examples of Virtual Peripheral modules are:

• Communication interfaces such as I

2C™, Microwire™

(µ-Wire), SPI, IrDA Stack, UART, and Modem func-

tions

• Frequency generation and measurement

• PPM/PWM output

• Delta/Sigma ADC

• DTMF generation/detection

• PSK/FSK generation/detection

• FFT/DFT based algorithms

1.3.2 The Communications Controller

The combination of the Scenix hardware architecture and

the Virtual Peripheral concept create a powerful, creative

platform for the communications design communities: SX

communications controller. Its high processing power,

recofigurability, cost-effectiveness, and overall design

freedom give the designer the power to build products for

the future with the confidence of knowing that they can

keep up with innovation in standards and other areas.

1.4

Programming and Debugging Support

The SX devices are currently supported by third party

tool vendors. On-chip in-system debug capabilities have

been added, allowing tools to provide an integrated

development environment including editor, macro assem-

bler, debugger, and programmer. Un-obtrusive in-system

programming is provided through the OSC pins. There is

no need for a bon-out chip, so the user does not have to

worry about the potential variations in electrical charac-

teristics of a bond-out chip and the actual chip used in the

target applications. the user can test and revise the fully

debugged code in the actual SX, in the actual application,

and get to production much faster.

1.5

Applications

Emerging applications and advances in existing ones

require higher performance while maintaining low cost

and fast time-to-production.

The device provides solutions for many familiar applica-

tions such as process controllers, electronic appli-

ances/tools,

security/monitoring

systems,

consumer

automotive, sound generation, motor control, and per-

sonal communication devices. In addition, the device is

suitable for applications that require DSP-like capabili-

ties, such as closed-loop servo control (digital filters), dig-

ital answering machines, voice notation, interactive toys,

and magnetic-stripe readers.

Furthermore, the growing Virtual Peripheral library fea-

tures new components, such as the Internet Protocol

stack, and communication interfaces, that allow design

engineers to embed Internet connectivity into all of their

products at extremely low cost and very little effort.

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