E28F640J3C-125 Datasheet

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256-Mbit J3 (x8/x16)

Figure 26. Protection Register Programming Flowchart

Start

Bus Operation

Write

Write

Command

Protection Program

Setup

Protection Program

Comments

Data = C0H

Data = Data to Program

Addr = Location to Program

Status Register Data Toggle

CE# or OE# to Update Status

Register Data

Check SR.7

1 = WSM Ready

0 = WSM Busy

Write C0H

(Protection Reg.

Program Setup)

Write Protect. Register

Address/Data

Read

Standby

Read Status Register

SR.7 = 1?

Yes

Full Status

Check if Desired

No

Protection Program operations can only be addressed within the protection

register address space. Addresses outside the defined space will return an

error.

Repeat for subsequent programming operations.

SR Full Status Check can be done after each program or after a sequence of

program operations.

Write FFH after the last program operation to reset device to read array mode.

Program Complete

FULL STATUS CHECK PROCEDURE

Read Status Register

Data (See Above)

1, 1

SR.3, SR.4 =

V

PEN

Range Error

0,1

SR.1, SR.4 =

Standby

Bus Operation

Standby

Command

Comments

SR.1 SR.3 SR.4

0

1

1

V

PEN

Low

0

0

1

Prot. Reg.

Prog. Error

Register

Locked:

Aborted

1

0

1

Protection Register

Programming Error

Attempted Program to

Locked Register -

Aborted

Standby

SR.3 MUST be cleared, if set during a program attempt, before further

attempts are allowed by the Write State Machine.

1,1

SR.1, SR.4 =

SR.1, SR.3 and SR.4 are only cleared by the Clear Staus Register Command,

in cases of multiple protection register program operations before full status is

checked.

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

error recovery.

Program Successful

Datasheet

67

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