JS28F256P30B95A datasheet(83/97 Pages) MICRON

83 / 97 page

August 2008

Datasheet

Order Number: 306666-12

P30

Figure 37: BEFP Flowchart

NOTES:

1. First-word address to be programmed within the target block must be aligned on a write -buffer boundary.

2. Write-buffer contents are programmed sequentially to the flash array starting at the first word address (WSM internally increments addressing ).

BEFP Exit

Repeat for subsequent blocks ;

After BEFP exit, a full Status Register check can

determine if any program error occurred ;

See full Status Register check procedure in the

Word Program flowchart.

Write 0xFF to enter Read Array state .

Standby

Read

Bus

State

Operation

Status

Check

Exit

Status

Com ments

Data = Status Register Data

Address = 1st Word Addr.

Check SR[7]:

0 = Exit Not Completed

1 = Exit Completed

BEFP Setup

Comments

Bus

State

Operation

Write

(Note 1)

BEFP

Setup

Write

BEFP

Confirm

Read

Status

Standby

BEFP

Setup

Done?

Write

Unlock

Block

Data = 0x80 @ 1st Word

Address

Data = 0x80 @ 1st Word

Address

Data = Status Register Data

Address = 1st Word Addr.

Check SR [7]:

0 = BEFP Ready

1 = BEFP Not Ready

VPPH applied to VPP

Standby

Error

Condition

Check

If SR[7] is set, check:

SR[3] set = VPP Error

SR[1] set = Locked Block

No (SR[0]=1)

Write Data @ 1st

Word Address

Last

Data?

Write 0xFFFF,

Address Not within

Current Block

Program

Done?

Read

Status Reg .

Yes (SR[0]=0)

No (SR[7]=0)

Full Status Check

Procedure

Program

Complete

Read

Status Reg .

BEFP

Exited ?

Yes (SR[7]=1)

Start

Write 80h @

1st Word Address

VPP applied

Block Unlocked

Write D0h @

1st Word Address

BEFP Setup

Done?

Read

Status Reg .

No (SR[7]=1)

Exit

Program & Verify Phase

Exit Phase

Setup Phase

BUFFERED ENHANCED FACTORY PROGRAMMING (BEFP) PROCEDURE

Check

X = 32?

Initialize Count:

X = 0

Increment Count:

X = X+1

Check VPP, Lock

errors (SR[3,1])

Yes (SR[7]=0)

BEFP Setup delay

Data Stream

Ready?

Read

Status Reg .

Yes (SR[0]=0)

No (SR[0]=1)

BEFP Program & Verify

Comments

Bus

State

Write

(note 2)

Load

Buffer

Standby

Increment

Count

Standby

Initialize

Count

Data = Data to Program

Address = 1st Word Addr.

X = X+1

X = 0

Read

Status

Standby

Program

Done?

Data = Status Reg. Data

Address = 1st Word Addr.

Check SR[0]:

0 = Program Done

1 = Program in Progress

Write

Exit Prog &

Verify Phase

Data = 0xFFFF @ address

not in current block

Standby

Last

Data?

No = Fill buffer again

Yes = Exit

Standby

Buffer

Full?

X = 32?

Yes = Read SR [0]

No = Load Next Data Word

Read

Standby

Status

Data Stream

Ready?

Data = Status Register Data

Address = 1st Word Addr.

Check SR[0]:

0 = Ready for Data

1 = Not Ready for Data

O peration

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