M28W320FSU datasheet(11/49 Pages) STMICROELECTRONICS

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M28W320FSU, M28W640FSU

HARDWARE PROTECTION

All devices feature hardware protection. Refer to

SIGNAL DESCRIPTIONS section for a detailed

description of these signals.

VPP ≤ VPPLK. The VPP pin protects all the memo-

ry blocks from program and erase operations. Re-

fer to SIGNAL DESCRIPTIONS section for a

detailed description of these signals.

SECURITY FEATURES

The

M28W320FSU

and

M28W640FSU

are

equipped with KRYPTO Security features per-

forming software protection. They allow any block

to be protected from program/erase or read oper-

ations:

■

Modify Protection including Volatile Block

Lock/Unlock, Non-Volatile Block Modify

Protection, Non-Volatile Password Modify

Protection and Irreversible Protection.

■

Read Protection.

The KRYPTO features (Modify Protection mode,

Read Protection mode and Device Authentication

mechanism) are not described in this Datasheet.

For further details concerning these additional pro-

tection modes please contact ST Sales Offices.

The devices also feature a 64 bit Unique Device

Identifier and a 128 bit user-programmable OTP

segment (see Figure 6., Protection Register Mem-

ory Map and Protection Register Program Com-

mand).

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