N28F001BN-B150 查看數據表（PDF） - Intel

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N28F001BN-B150

1-MBIT (128K x 8) BOOT BLOCK FLASH MEMORY

Intel 

28F001BX-T 28F001BX-B

Reprogrammable environments such as the per-

sonal computer are ideal applications for the

28F001BX The internal state machine provides

SRAM-like timings for program and erasure using

the Command and Status Registers The blocking

scheme allows BIOS update in the main and param-

eter blocks while still providing recovery code in the

boot block in the unlikely event a power failure oc-

curs during an update or where BIOS code is cor-

rupted Parameter blocks also provide convenient

configuration storage backing up SRAM and battery

configurations EISA systems for example can

store hardware configurations in a flash parameter

block reducing system SRAM

Laptop BIOSs are becoming increasingly complex

with the addition of power management software

and extended system setup screens BIOS code

complexity increases the potential for code updates

after the sale but the compactness of laptop de-

signs makes hardware updates very costly Boot

block flash memory provides an inexpensive update

solution for laptops while reducing laptop obsoles-

cence For portable PCs and hand-held equipment

the deep powerdown mode dramatically lowers sys-

tem power requirements during periods of slow op-

eration or sleep modes

The 28F001BX gives the embedded system design-

er several desired features The internal state ma-

chine reduces the size of external code dedicated to

the erase and program algorithms as well as freeing

the microcontroller or microprocessor to respond to

other system requests during program and erasure

The four blocks allow logical segmentation of the

entire embedded software the 8-KByte block for the

boot code the 112-KByte block for the main pro-

gram code and the two 4-KByte blocks for updatable

parametric data storage diagnostic messages and

data or extensions of either the boot code or pro-

gram code The boot block is hardware protected

against unauthorized write or erase of its vital code

in the field Further the powerdown mode also locks

out erase or write operations providing absolute

data protection during system powerup or power

loss This hardware protection provides obvious ad-

vantages for safety related applications such as

transportation military and medical The 28F001BX

is well suited for minimum-chip embedded applica-

tions ranging from communications to automotive

290406 – 5

Figure 5 28F001BX-T in a 80C188 System

290406 – 6

Figure 6 28F001BX-B in a 80C51 System

5

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