AT88SC1608 データシートの表示（PDF） - Atmel Corporation

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コンポーネント説明

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AT88SC1608

8 x 256 x 8 Secure Memory with Authentication

Atmel Corporation 

AT88SC1608

Configuration Zone

Identification Number

(Nc)

• Answer-to-reset: 32-bit register defined by Atmel

• Lot History Code: 32-bit register defined by Atmel

• Fab Code: 16-bit register defined by Atmel

• Card Manufacturer Code: 32-bit register defined by the card manufacturer

• Access Registers

Eight 8-bit access registers defined by the issuer (enable if “0”). The access register for

each user zone will specify the privileges and requirements for access to that zone.

Table 4. Access Registers

Bit 7

WPE

Bit 6

RPE

Bit 5

ATE

Bit 4

PW2

Bit 3

PW1

Bit 2

PW0

Bit 1

MDF

Bit 0

PGO

• Write Password Enable (WPE)

If enabled (WPE = “0”), the user is required to verify the write password to allow write

operations in the user zone. If disabled (WPE = “1”), all write operations are allowed

within the zone. Verification of the write password also allows the read and write pass-

words to be changed. During personalization (PER = “1”) the WPE bit is forced active

even if set to “1”. This forces the issuer to verify the write password in order to write data

to the user zone. This allows the security code (Write 7 password) to lock write functions

during transportation.

• Read Password Enable (RPE)

If enabled (RPE = “0”), the user is required to verify either the read password or write

password to allow read operations in the user zone. Read operations initiated without a

verified password will return the status of the fuse bits ($00). Verification of the write

password will always allow read access to the zone. RPE = “0” and WPE = “1” is

allowed but is not recommended.

• Authentication Enable (ATE)

If enabled (ATE = “0”), a valid authentication sequence must be completed before

access is allowed to the user zone. If disabled (ATE = “1”), authentication is not required

for access.

• Password Set Select (PW2, PW1, PW0)

These three bits define which of the eight password sets must be presented to allow

access to the user zone. Each access register may point to a unique password set, or

access registers for multiple zones may point to the same password set. In this case,

verification of a single password will open several zones, combining the zones into a

single larger zone.

• Modify Forbidden (MDF)

If enabled (MDF = “0”), no write access is allowed in the zone at any time.

• Program Only (PGO)

If enabled (PGO = “0”), data within the zone may be changed from “1” to “0” but never

from “0” to “1”.

An identification number with up to 56 bits is defined by the issuer and should be unique

for each card.

7

0971G–SMEM–04/04

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