S29AL016M90BAIR23 View Datasheet(PDF) - Spansion Inc.

Part Name

Description

Manufacturer

S29AL016M90BAIR23

16 Megabit (2 M x 8-Bit/1 M x 16-Bit) 3.0 Volt-only Boot Sector Flash Memory featuring MirrorBit™ technology

Spansion Inc. 

cept that RESET# may be at either VIH or VID. This allows in-system protec-

tion of the SecSi Sector without raising any device pin to a high voltage. Note

that this method is only applicable to the SecSi Sector.

„ To verify the protect/unprotect status of the SecSi Sector, follow the algo-

rithm shown in Figure 3.

Once the SecSi Sector is programmed, locked and verified, the system must

write the Exit SecSi Sector Region command sequence to return to reading and

writing within the remainder of the array.

Factory Locked: SecSi Sector Programmed and Protected At the

Factory

In devices with an ESN, the SecSi Sector is protected when the device is shipped

from the factory. The SecSi Sector cannot be modified in any way. An ESN Fac-

tory Locked device has a 16-byte random ESN at addresses 0F8000h–0F8007h.

Please contact your local sales office or representative for details on ordering ESN

Factory Locked devices.

Customers may opt to have their code programmed by the manufacturer

through the ExpressFlash service (Express Flash Factory Locked). The devices

are then shipped from the factory with the SecSi Sector permanently locked.

Contact an sales office or representative for details on using the ExpressFlash

service.

START

RESET# =

VIH or VID

Wait 1 ms

Write 60h to

any address

Write 40h to SecSi

Sector address

with A6 = 0,

A1 = 1, A0 = 0

Read from SecSi

Sector address

with A6 = 0,

A1 = 1, A0 = 0

If data = 00h,

SecSi Sector is

unprotected.

If data = 01h,

SecSi Sector is

protected.

Remove VIH or VID

from RESET#

Write reset

command

SecSi Sector

Protect Verify

complete

Figure 3. SecSi Sector Protect Verify

Common Flash Memory Interface (CFI)

The Common Flash Interface (CFI) specification outlines device and host system

software interrogation handshake, which allows specific vendor-specified soft-

ware algorithms to be used for entire families of devices. Software support can

then be device-independent, JEDEC ID-independent, and forward- and back-

April 21, 2004 S29AL016M_00A4

S29AL016M

20

Share Link: