AB28F400BX-T90 Ver la hoja de datos (PDF) - Intel

Número de pieza

componentes Descripción

Fabricante

AB28F400BX-T90

4-MBIT (256K x16, 512K x8) BOOT BLOCK FLASH MEMORY FAMILY

Intel 

A28F400BX-T B

290501 – 7

Bus

Command

Operation

Comments

Write

Write

Setup

Program

Program

Data e 40H

Address e Word to be

programmed

Data to be programmed

Address e Word to be

programmed

Read

Status Register Data

Toggle OE or CE to update

Status Register

Standby

Check SR 7

1 e Ready 0 e Busy

Repeat for subsequent words

Full status check can be done after each word or after a

sequence of words

Write FFH after the last word programming operation to

reset the device to Read Array Mode

Full Status Check Procedure

Bus

Command

Operation

Comments

Standby

Check SR 3

1 e VPP Low Detect

Standby

Check SR 4

1 e Word Program Error

SR 3 MUST be cleared if set during a program attempt

before further attempts are allowed by the Write State

Machine

SR 4 is only cleared by the Clear Status Register

Command in cases where multiple words are programmed

before full status is checked

If error is detected clear the Status Register before

attempting retry or other error recovery

290501 – 8

Figure 7 Automated Word Programming Flowchart

19

Share Link: