P28F010-90 データシートの表示（PDF） - Intel

部品番号

コンポーネント説明

メーカー

P28F010-90

28F010 1024K (128K X 8) CMOS FLASH MEMORY

Intel 

E

28F010

290207-4

Figure 3. 28F010 in a 80C186 System

2.0 PRINCIPLES OF OPERATION

Flash memory augments EPROM functionality with

in-circuit electrical erasure and reprogramming. The

28F010 introduces a command register to manage

this new functionality. The command register allows

for: 100% TTL-level control inputs; fixed power

supplies during erasure and programming; and

maximum EPROM compatibility.

In the absence of high voltage on the VPP pin, the

28F010 is a read-only memory. Manipulation of the

external memory control pins yields the standard

EPROM read, standby, output disable, and

intelligent identifier operations.

The same EPROM read, standby, and output

disable operations are available when high voltage

is applied to the VPP pin. In addition, high voltage

on VPP enables erasure and programming of the

device. All functions associated with altering

memory contents—intelligent identifier, erase,

erase verify, program, and program verify—are

accessed via the command register.

8

Commands are written to the register using

standard microprocessor write timings. Register

contents serve as input to an internal state machine

which controls the erase and programming circuitry.

Write cycles also internally latch addresses and

data needed for programming or erase operations.

With the appropriate command written to the

register, standard microprocessor read timings

output array data, access the intelligent identifier

codes, or output data for erase and program

verification.

2.1 Integrated Stop Timer

Successive command write cycles define the

durations of program and erase operations;

specifically, the program or erase time durations are

normally terminated by associated Program or

Erase Verify commands. An integrated stop timer

provides simplified timing control over these

operations; thus eliminating the need for maximum

program/erase timing specifications. Programming

and erase pulse durations are minimums only.

When the stop timer terminates a program or erase

operation, the device enters an inactive state and

remains inactive until receiving the appropriate

Verify or Reset command.

Share Link: