JS28F256P33BFE datasheet(74/90 Pages) MICRON

74 / 90 page

P33-65nm

Datasheet

Aug 2009

Order Number: 320003-08

Figure 33: Buffer Program Flowchart

Start

Get Next

Target Address

Issue Write to Buffer

Command E8h and

Block Address

Read Status Register

Block Address

(note 7)

Is WSM Ready?

SR. 7=

1 = Yes

Device

Supports Buffer

Writes?

Set Timeout or

Loop Counter

Timeout

or Count

Expired?

Write Confirm D0h

and Block Address

Another Buffered

Programming?

Yes

Write Buffer Data

Start Address

X =0

Yes

0 = No

Yes

Use Single Word

Programming

Abort Bufferred

Program?

X =N?

Write Buffer Data

Block Address

X = X + 1

Write to another

Block Address

Buffered Program

Aborted

Yes

Write Word Count

Block Address

Notes:

1. Word count values on DQ 0-DQ15 are loaded into the Count

2. The device outputs the status register when read.

3. Write Buffer contents will be programmed at the device start

address or destination flash address .

4. Align the start address on a Write Buffer boundary for maximum

programming performance (i.e., A8-A1 of the start address =0).

5. The device aborts the Buffered Program command if the

current address is outside the original block address .

6. The Status register indicates an “improper command

Sequence” if the Buffered Program command is aborted. Follow

this with a Clear Status Register command .

7. The device default state is to output SR data after the Buffered

Programming Setup Command (E8h).CE# and OE low drive the

device to update Status Register . It is not allowed to issue 70h to

read SR data after E8h command otherwise 70h would be

counted as Word count.

8. Full status check can be done after all erase and write

sequences complete . Write FFh after the last operation to reset

the device to read array mode.

Bus

Operation

Standby

Read

Command

Write

Write to

Buffer

Read

(Note 7)

Standby

Comments

Check SR.7

1 = WSM Ready

0 = WSM Busy

Status register Data

CE # and OE# low updates SR

Addr = Block Address

Data =E8H

Addr = Block Address

SR. 7 = Valid

Addr = Block Address

Check SR.7

1 = Device WSM is Busy

0 = Device WSM is Ready

Write

Program

Confirm

Data =D0H

Addr = Block Address

Write

( Notes1, 2)

Data =N- 1 = Word Count

N = 0 corresponds to count=1

Addr = Block Address

Write

( Notes3, 4)

Data = Write Buffer Data

Addr = Start Address

Write

( Notes5, 6)

Data = Write Buffer Data

Addr = Block Address

Suspend

Program

Loop

Read Status Register

SR. 7=?

Full Status

Check if Desired

Program Complete

Suspend

Program

Yes

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