at88sc153 ATMEL Corporation, at88sc153 Datasheet - Page 5

• Manufacturer Part Number: at88sc153
• Description: 3 X 64 X 8 Secure Memory With Authentication
• Manufacturer: ATMEL Corporation

5. Fuses
Table 5-2.
Note:
1016E–SMEM–12/07
Zone
Fabrication
(Except CMC, MTZ and AR)
Card Manufacturer
Code
Access Registers
Memory Test Zone
Identification
Secret
Passwords
PAC
User Zones
CMC: Card Manufacturer Code
AR: Access Rights as defined by the access registers
PW: Password
Access Rights
FAB, CMA, and PER are nonvolatile fuses blown at the end of each card life step. Once blown,
these EEPROM fuses can not be reset.
The device responds to a read fuse command with fuse byte.
Table 5-1.
When the fuses are all “1”s, read and write are allowed in the entire memory. Before blowing the
FAB fuse, Atmel writes the entire memory to “1” and programs the fabrication subzone (except
CMC and AR) and the secure code.
• The FAB fuse is blown by Atmel prior to shipping wafers to the card manufacturer.
• The CMA fuse is blown by the card manufacturer prior to shipping cards to the issuer.
• The PER fuse is blown by the issuer prior to shipping cards to the end user.
Bit 7
0
Access
Read
Read
Read
Read
Read
Read
Read
Read
Read
Write
Write
Write
Write
Write
Write
Write
Write
Write
Bit 6
Fuse Byte
0
Bit 5
0
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Forbidden
FAB = 0
Free
Free
Free
Free
Free
Free
Free
AR
AR
Bit 4
0
Bit 3
0
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Secure Code
Forbidden
Forbidden
CMA = 0
Free
Free
Free
Free
Free
Free
Free
AR
AR
Bit 2
PER
CMA
Bit 1
Forbidden
Forbidden
Forbidden
Forbidden
Forbidden
Forbidden
Write PW
Write PW
Write PW
PER = 0
Bit 0
FAB
Free
Free
Free
Free
Free
Free
Free
AR
AR
5