E
4-MBIT SmartVoltage BOOT BLOCK FAMILY
The 4-Mbit flash memory products are also
excellent design solutions for digital cellular phone
and telecommunication switching applications
requiring very low power consumption, high-
performance, high-density storage capability,
modular software designs, and a small form factor
package. The 4-Mbit’s blocking scheme allows for
easy segmentation of the embedded code with
16 Kbytes of hardware-protected boot code, four
main blocks of program code and two parameter
blocks of 8 Kbytes each for frequently updated data
storage and diagnostic messages (e.g., phone
numbers, authorization codes).
1.3
Applications
The 4-Mbit boot block flash memory family
combines
high-density,
low-power,
high-
performance, cost-effective flash memories with
blocking and hardware protection capabilities. Their
flexibility and versatility reduce costs throughout the
product life cycle. Flash memory is ideal for Just-In-
Time production flow, reducing system inventory
and costs, and eliminating component handling
during the production phase.
When your product is in the end-user’s hands, and
updates or feature enhancements become
necessary, flash memory reduces the update costs
by allowing user-performed code changes instead
of costly product returns or technician calls.
Intel’s boot block architecture provides a flexible
voltage solution for the different design needs of
various applications. The asymmetrically-blocked
memory map allows the integration of several
memory components into a single flash device. The
boot block provides a secure boot PROM; the
The 4-Mbit boot block flash memory family provides
full-function, blocked flash memories suitable for a
wide range of applications. These applications
include extended PC BIOS and ROM-able
applications storage, digital cellular phone program
and data storage, telecommunication boot/firmware,
printer firmware/font storage and various other
embedded applications where program and data
storage are required.
parameter
blocks
can
emulate
EEPROM
functionality for parameter store with proper
software techniques; and the main blocks provide
code and data storage with access times fast
enough to execute code in place, decreasing RAM
requirements.
Reprogrammable systems, such as personal
computers, are ideal applications for the 4-Mbit
flash memory products. Increasing software
sophistication greatens the probability that a code
update will be required after the PC is shipped. For
example, the emerging of “plug and play” standard
in desktop and portable PCs enables auto-
configuration of ISA and PCI add-in cards.
However, since the “plug and play” specification
continues to evolve, a flash BIOS provides a cost-
effective capability to update existing PCs. In
addition, the parameter blocks are ideal for storing
1.4
Pinouts
Intel’s SmartVoltage Boot Block architecture
provides upgrade paths in every package pinout to
the 8-Mbit density. The 28F004B 40-lead TSOP
pinout for space-constrained designs is shown in
Figure 3. The 28F400 44-lead PSOP pinout follows
the industry-standard ROM/EPROM pinout, as
shown in Figure 4. For designs that require x16
operation but have space concerns, refer to the
48-lead pinout in Figure 5. Furthermore, the 28F400
56-lead TSOP pinout shown in Figure 6 provides
density upgrades to future higher density boot block
memories.
the
allowing you to integrate the BIOS PROM and
parameter storage EEPROM into single
required
auto-configuration
parameters,
a
component, reducing parts costs while increasing
functionality.
Pinouts for the corresponding 2-Mbit and 8-Mbit
components are also provided for convenient
reference. 4-Mbit pinouts are given on the chip
illustration in the center, with 2-Mbit and 8-Mbit
pinouts going outward from the center.
7
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