28F020 datasheet(5/38 Pages) INTEL

5 / 38 page

28F020

1.0 APPLICATIONS

The 28F020 flash memory provides nonvolatility

along with the capability to perform over 100,000

electrical chip-erasure/reprogram cycles. These

features make the 28F020 an innovative alternative

to disk, EEPROM, and battery-backed static RAM.

Where periodic updates of code and data tables

are required, the 28F020’s reprogrammability and

nonvolatility

make

the

obvious

and

ideal

replacement for EPROM.

Primary applications and operating systems stored

in flash eliminate the slow disk-to-DRAM download

process. This results in dramatic enhancement of

performance and substantial reduction of power

consumption—a

consideration

particularly

important in portable equipment. Flash memory

increases flexibility with electrical chip-erasure and

in-system update capability of operating systems

and application code. With updatable code, system

manufacturers

can

easily

accommodate

last-

minute changes as revisions are made.

In diskless workstations and terminals, network

traffic reduces to a minimum and systems are

instant-on. Reliability exceeds that of electro-

mechanical media. Often in these environments,

power interruptions force extended re-boot periods

for all networked terminals. This mishap is no

longer an issue if boot code, operating systems,

communication protocols and primary applications

are flash resident in each terminal.

For embedded systems that rely on dynamic

RAM/disk for main system memory or nonvolatile

backup storage, the 28F020 flash memory offers a

solid state alternative in a minimal form factor. The

28F020 provides higher performance, lower power

consumption, instant-on capability, and allows an

“eXecute in place” (XIP) memory hierarchy for

code and data table reading. Additionally, the flash

memory is more rugged and reliable in harsh

environments where extreme temperatures and

shock can cause disk-based systems to fail.

The need for code updates pervades all phases of

system’s

life—from

prototyping

system

manufacture to after sale service. The electrical

chip-erasure and reprogramming ability of the

28F020 allows in-circuit alterability; this eliminates

unnecessary handling and less reliable socketed

connections,

while

adding

greater

test,

manufacture, and update flexibility.

Material and labor costs associated with code

changes increases at higher levels of system

integration—the most costly being code updates

after sale. Code “bugs,” or the desire to augment

system

functionality,

prompt

after

sale

code

updates. Field revisions to EPROM-based code

requires the removal of EPROM components or

entire boards. With the 28F020, code updates are

implemented locally via an edge connector, or

remotely over a communications link.

For systems currently using a high-density static

RAM/battery configuration for data accumulation,

flash memory’s inherent nonvolatility eliminates the

need for battery backup. The concern for battery

failure no longer exists, an important consideration

for portable equipment and medical instruments,

both requiring continuous performance. In addition,

flash memory offers a considerable cost advantage

over static RAM.

Flash

memory’s

electrical

chip-erasure,

byte

programmability and complete nonvolatility fit well

with data accumulation and recording needs.

Electrical chip-erasure gives the designer a “blank

slate” in which to log or record data. Data can be

periodically off-loaded for analysis and the flash

memory erased producing a new “blank slate.”

A high degree of on-chip feature integration

simplifies memory-to-processor interfacing. Figure

3 depicts two 28F020s tied to the 80C186 system

bus. The 28F020’s architecture minimizes interface

circuitry needed for complete in-circuit updates of

memory contents.

The outstanding feature of the TSOP (Thin Small

Outline Package) is the 1.2 mm thickness. TSOP

is particularly suited for portable equipment and

applications requiring large amounts

flash

memory.

With

cost-effective

in-system

reprogramming,

extended cycling capability, and true nonvolatility,

the 28F020 offers advantages to the alternatives:

EPROMs, EEPROMs, battery backed static RAM,

or disk. EPROM-compatible read specifications,

straightforward interfacing, and in-circuit alterability

offers designers unlimited flexibility to meet the

high standards of today’s designs.

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