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

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AB28F400BX-T90

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

Intel 

A28F400BX-T B

Bus

Command

Operation

Comments

Write

Setup

Erase

Data e 20H

Address e Within block to be

erased

Write

Erase

Data e D0H

Address e Within block to be

erased

Read

Status Register Data

Toggle OE or CE to update

Status Register

290501 – 9

Standby

Check SR 7

1 e Ready 0 e Busy

Repeat for subsequent blocks

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

sequence of blocks

Write FFH after the last block erase 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 5

Both 1 e Command Sequence

Error

Standby

Check SR 5

1 e Block Erase Error

SR 3 MUST be cleared if set during an erase attempt

before further attempts are allowed by the Write State

Machine

SR 5 is only cleared by the Clear Status Register

Command in cases where multiple blocks are erased

before full status is checked

If error is detected clear the Status Register before

attempting retry or other error recovery

290501 – 10

Figure 8 Automated Block Erase Flowchart

20

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