M28W640FST datasheet(5/55 Pages) STMICROELECTRONICS

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M28W320FST, M28W320FSB, M28W640FST, M28W640FSB

SUMMARY DESCRIPTION

The M28W320FS and M28W640FS are 32 Mbit

(2Mbit x 16) and 64 Mbit (4Mbit x 16) Secure Flash

memories. The devices can be erased electrically

at block level and programmed in-system on a

Word-by-Word basis using a 2.7V to 3.6V VDD

supply for the circuitry and a 1.65V to 3.6V VDDQ

supply for the Input/Output pins. An optional 12V

VPP power supply is provided to speed up custom-

er programming.

The

M28W320FS

and

M28W640FS

feature

32Mbit and 64 Mbits respectively and have an

asymmetrical block architecture with 4 KWord Pa-

rameter Blocks and 32 KWord Main Blocks. The

M28W320FST and M28W640FST have the Pa-

rameter Blocks at the top of the memory address

space

while

the

M28W320FSB

and

M28W640FSB locate the Parameter Blocks start-

ing from the bottom. Refer to Table 1., Figure 5.

and Figure 6. for a detailed description of the de-

vices memory architecture and map.

All devices are equipped with hardware and soft-

ware block protection features to avoid unwanted

program/erase (modify) or read of the Flash mem-

ory content:

■

Hardware Protection:

–

When VPP ≤VPPLK all blocks are protected

against program or erase.

■

Software Protection thanks to KRYPTO

Security Features:

–

Modify Protection: volatile and non-

volatile.

–

Read Protection.

The KRYPTO Security features are described in a

dedicated Application Note. Please contact STMi-

croelectronics for further details.

Two registers are available for protection purpose:

■

The Protection Register

■

The KRYPTO Protection Register.

The Protection Register is a 192 bit Protection

sign. The Protection Register is divided into a 64

bit segment and a 128 bit segment. The 64 bit seg-

ment contains a unique device number written by

ST, while the second one is one-time-programma-

ble by the user. The user programmable segment

can be permanently protected. Figure 7., shows

the Protection Register Memory Map.

The KRYPTO Protection Register is used to man-

age the Modify and Read protection modes. It also

features a Device Authentication mechanism. The

KRYPTO Protection Register is described in a

dedicated Application Note. Please contact STMi-

croelectronics for further details.

Each block can be erased separately. Erase can

be suspended in order to perform either read or

program in any other block and then resumed.

Program can be suspended to read data in any

other block and then resumed. Each block can be

programmed and erased over 100,000 cycles.

Program and Erase commands are written to the

Command Interface of the memory. An on-chip

Program/Erase Controller takes care of the tim-

ings necessary for program and erase operations.

The end of a program or erase operation can be

detected and any error conditions identified. The

command set required to control the memory is

consistent with JEDEC standards.

All the devices are offered in a TBGA64 (10 x

13mm) package.

In order to meet environmental requirements, ST

offers the M28W320FS and M28W640FS in ECO-

PACK® packages. ECOPACK packages are

Lead-free. The category of second Level Intercon-

nect is marked on the package and on the inner

box label, in compliance with JEDEC Standard

JESD97. The maximum ratings related to solder-

ing conditions are also marked on the inner box la-

bel.

ECOPACK is an ST trademark. ECOPACK speci-

fications are available at: www.st.com.

All devices are supplied with all the bits erased

(set to ’1’).

Table 1. M28W320FS and M28W640FS Memory Architecture

Note: 1. Erasable Block size.

Device

Parameter Blocks

Main Blocks

No. of Blocks

Block Size(1)

No. of

Blocks

Block Size

M28W320FS

4 KWords

32 KWords

M28W640FS

4 KWords

127

32 KWords

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