M28W320FST, M28W320FSB, M28W640FST, M28W640FSB
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 blocks.
Refer to SIGNAL DESCRIPTIONS section for a
detailed description of these signals.
SECURITY FEATURES
The M28W320FS and M28W640FS are equipped
with KRYPTO Security features performing soft-
ware protection. They allow any block to be pro-
tected from program/erase or read operations:
■ 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 7., Protection Register Mem-
ory Map and Protection Register Program Com-
mand).
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