319942 datasheet(57/67 Pages) NUMONYX

57 / 67 page

Numonyx® Embedded Flash Memory (J3 65 nm) Single Bit per Cell (SBC)

Datasheet

Figure 24: Protection Register Programming Flowchart

Start

Write C0H

(Protection Reg.

Program Setup)

Write Protect. Register

Address/Data

Read Status Register

SR.7 = 1?

Full Status

Check if Desired

Program Complete

Read Status Register

Data (See Above)

PEN Range Error

Protection Register

Programming Error

Attempted Program to

Locked Register -

Aborted

Program Successful

SR.3, SR.4 =

SR.1, SR.4 =

FULL STATUS CHECK PROCEDURE

Bus Operation

Write

Standby

Protection Program operations can only be addressed within the protection

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.

Bus Operation

Standby

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

attempts are allowed by the Write State Machine.

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.

Yes

1, 1

0,1

1,1

Command

Protection Program

Setup

Protection Program

Comments

Data = C0H

Data = Data to Program

Addr = Location to Program

Check SR.7

1 = WSM Ready

0 = WSM Busy

Command

Comments

SR.1 SR.3 SR.4

PEN Low

Prot. Reg.

Prog. Error

Locked:

Aborted

Read

Status Register Data Toggle

CE# or OE# to Update Status

Standby

319942 Datasheet(PDF) 57 Page - Numonyx B.V

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