AT88SC102 查看數據表（PDF） - Unspecified

零件编号

产品描述 (功能)

生产厂家

AT88SC102

1K EEPROM– Security Logic with Two Application Zones

Unspecified 

AT88SC102

Table 6-2.

Zone

E1

E2

EC

Enabled

E2

EC

Disabled

Definition of AT88SC102 Internal Flags (Continued)

Definition

Operation

Application Zone 1 Erase

Flag

The E1 flag is set by correctly matching the

Application Zone 1 Erase Key (EZ1) bit by bit as pin

CLK increments the address counter. To complete an

erase operation of AZ1 in Security Level 2, an erase

operation must be performed on Bit 736 after E1 is

set. The E1 flag is reset when the address counter =

0.

Application Zone 2 Erase

Flag with Erase Counter

operation enabled.

(EC2EN FUSE = “1”)

This flag is set by correctly matching the Application

Zone 2 Erase Key (EZ2) bit by bit as pin CLK

increments the address counter. Then a validation

operation must be completed. This operation

requires the user to find a bit in Application Zone 2

Erase Counter (EC2), addresses 1280–1407, that is

a logic “1”. A write must then be performed, followed

by an erase. The AT88SC102 will validate that the

comparison was correct and Application Zone 2 will

be erased. This flag is also reset when the address

counter = 0.

Application Zone 2 Erase

Flag with Erase Counter

operation disabled.

(EC2EN FUSE = “0”)

E2 is set when the Application Zone 2 Erase Key

comparison is valid. It is reset when the address

counter = 0.

Function

Application Zone 1 (Bits 176–

687) will be erased when E1 is

set and an erase is performed on

Bit 736. This operation erases all

bits in Application Zone 1. There

is no limit to the number of erase

operations that can be performed

on AZ1.

Application Zone 2 (Bits 736–

1237) is erased when E2 is set

and an erase is performed after

the validation operation in EC2

described above. This operation

erases all bits in Application Zone

2.

Application Zone 2 (bits 736–

1247) is erased when E2 is set

and an erase is performed on Bit

1280. This operation erases all

bits in Application Zone 2 but

does not affect the word

containing Bit 1280.

7. Definition of AT88SC102 Passwords

Table 7-1. Definition of Passwords

Table 1.

Password

Security Code (SC)

Bits 80–95

(16 bits)

Application Zone 1 Erase Key (EZ1)

Bits 688–735

(48 bits)

Application Zone 2 Erase Key (EZ2)

Bits 1248–1279

(32 bits)

Definition

This password is used to set the Security Validation (SV) flag and is used in determining what

operations are allowed in each zone (see Tables 1 and 2).

This password must be programmed during issuer personalization. It is used to erase

Application Zone 1 in Security Level 2. Verification of EZ1 will set the internal flag E1 to “1”.

This password must be programmed during issuer personalization. It is used to erase

Application Zone 2 in Security Level 2. Verification of EZ2 will set the internal flag E2 to “1”.

8. Definition of AT88SC102 Fuses

• Manufacturer Fuse

This fuse is used to control writes and erases of the Manufacturer Zone (MFZ). When the secu-

rity code has been validated and both the issuer fuse and the manufacturer fuse are unblown,

writes and erases of the MFZ are allowed. Blowing the issuer fuse will also disable the manufac-

turer fuse if it has not been blown previously.

9

1419C–SMEM–6/08

Share Link: