AT88SC0404CA-SU Atmel, AT88SC0404CA-SU Datasheet - Page 54

• Manufacturer Part Number: AT88SC0404CA-SU
• Description: IC EEPROM 4KBIT 4MHZ 8SOIC
• Manufacturer: Atmel
• Series: CryptoMemory®r

Specifications of AT88SC0404CA-SU

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 4K (512 x 8)
• Speed: 4MHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• For Use With: AT88SC-SDK1 - KIT TUEMA DK CRYPTOMEM SMARTCARDAT88SC-DK1 - KIT DEV FOR AT88SCXXXXC FAMILY
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.10. Verify Password: $BA
10.10.1. Functional
8664C–CRYPT–01/10
Table 37. Verify CRYPTO
The device increments the associated attempts counter each time prior to verifying the challenge, to prevent attacks. If
the authentication succeeds, the device memorizes this success, clears the attempts counter and returns $90 $00. If
the authentication fails, the device simply returns $69 $00. If the maximum number of trials has been exceeded, the
device will return $69 $00 instead of the INS code, after receiving the header, to indicate the command is unauthorized.
Figure 35. Verify Password Command Functional Description
Read password indices: $10 to $17 for passwords 0, 1, 2 and 7.
Write password indices: $00 to $07 for passwords 0, 1, 2 and 7.
Secure code index: $07 (equivalent to Write Password 7).
Four password index bits "r" and "ppp" indicate the password to compare:
Table 38. Verify Password Command Structure
If the maximum number of trials has been exceeded, the device will return $69 $00 instead of the INS code, after
receiving the header, to indicate the command is unauthorized. The device increments the associated attempts count
before verifying the password, to prevent attacks. If the password is correct, the device memorizes this success, clears
the attempts count and returns $90 $00. If the password is wrong, the device simply returns $69 $00 after incrementing
the attempts count. The Write 7 password is also known as the Secure Code and must be properly presented before
access to the configuration zone is granted when personalizing the device.
CLA
CLA
3-password bytes
**
**
r = 0: Write password,
r = 1: Read password,
p
2
p
1
p
0
: Password set number.
INS : Command
INS : Command
$BA
$B8
Command Structure
Verify CRYPTO
Password Index
Command
000r 0p
000e 00nn
Host
PW1
PW2
PW3
P1
P1
2
p
1
p
0
Atmel AT88SC0104/0204/0404/0808/CA
P2
P2
**
**
Device
$10
$30
P3
P3
d
7
--- ---d
d
Q1
7
--- ---d
PW1
0
0
d
63
--- ---d
Q8
Data Sent
Data Sent
d
15
56
PW2
--- ---d
d
7
--- ---d
CH1
8
0
d
23
d
PW3
--- ---d
63
--- ---d
CH8
16
53
56