AT49BV320CT datasheet(13/32 Pages) ATMEL

13 / 32 page

AT49BV320C(T)

3372D–FLASH–5/04

Sector Erase Flowchart

Full Erase Status Check Flowchart

Start

Suspend

Erase

Yes

Suspend

Erase

Loop

Write 20,

Address

Write D0,

Address

Read Status

SR7 =

Full Erase

Status Check

(If Desired)

Erase

Complete

(Erase)

(Erase Confirm)

Sector

1,1

Read Status

Erase

Successful

SR1 =

Sector

Locked

Error

SR3 =

Range

Error

SR4, SR5=

Command

Sequence Error

SR5 =

Erase

Error

Sector

Sector Erase Procedure

Full Erase Status Check Procedure

Bus

Operation

Command

Comments

Write

Sector

Erase

Setup

Data = 20

Addr = Sector to be erased (SA)

Write

Erase

Confirm

Data = D0

Addr = Sector to be erased (SA)

Read

None

Status register data: Toggle CE or

OE to update status register data

Idle

None

Check SR7

1 = WSM Ready

0 = WSM Busy

Repeat for subsequent sector erasures.

Full status register check can be done after each sector erase, or after a

sequence of sector erasures.

Write FF after the last operation to enter read mode.

Bus

Operation

Command

Comments

Idle

None

Check SR3:

1 = V

PP Range Error

Idle

None

Check SR4, SR5:

Both 1 = Command Sequence Error

Idle

None

Check SR5:

1 = Sector Erase Error

Idle

None

Check SR1:

1 = Attempted erase of locked sector;

erase aborted.

SR1, SR3 must be cleared before the Write State Machine allows further

erase attempts.

Only the Clear Status Register command clears SR1, SR3, SR4, SR5.

If an error is detected, clear the status register before attempting an

erase retry or other error recovery.

AT49BV320CT Datasheet(PDF) 13 Page - ATMEL Corporation

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