BL7442LV Low voltage
Intelligent 2K bits EEPROM
--Rewriting and erasing of a bit in the protection memory
Coding of the Chip
Due to security purposes every chip is irreversibly coded by a scheme. By this way fraud and
misuse is excluded. As an example, figures 10 and 11 show ATR and Directory Data of structure
1.When delivered, ATR header, ICM and ICT are programmed. Depending on the agreement
between the customer and Shanghai Belling CO. LTD. ICCF, the chip type and other content can
be also programmed before delivery.
ATR header
H1
H2
H3
H4
TM
LM
ATR data
ICM
ICT
ICCF
ICCSN
TT
LT
DIR data
TA
LA
AID
TD
LD
Application
FILE
AP
LA
LM
AID:Application identifier
AP:Application personalizer identifier
ATR:Answer-to-Reset
DIR:Directory
H1,H2:ATR protocol bytes
H3,H4:ATR historical bttes
ICCF:IC card fabricator identifier
ICCSN:IC card serial number
ICM:IC manufacturer identifier
ICT:IC type
LA:Length of AID
LD:Length of application template
LD
LT
LM:Length of manufacturer data
LT:Length of application template
TA:Tag of AID
TD:Tag of discretionary data
TM:Tag of manufacturer data
TT:Tag of application data
Figure 10 Synchronous Transmission ATR and Directory Data of Structure1
Protocol bytes according to ISO 7816-3
Protocol type H1
Protocol parameter H2
Historical bytes acoording to ISO 7816-4
Category indicator H3
DIR data reference H4
b8 b7 b6 b5 b4 b3 b2 b1 b8 b7 b6 b5 b4 b3 b2 b1 b8 b7 b6 b5 b4 b3 b2 b1 b8 b7 b6 b5 b4 b3 b2 b1
1 0 1 0 0 0 1 0 0 0 0 1 0 0 1 1 0 0 0 1 0 0 0 0 1 0 0 1 0 0 0 1
Number Length of
of data data units
x
units
in bits
(2
x
)
Category
indicator
according to ISO
7816-4
Protocol type RFU
Structure
indentifier
b8=1
b7-b1=
reference of
DIR data
RFU
0-7 =defined by ISO
8-E = notdel. by ISO
8= serial data access
protocol
9=3 wire bus protocol
A=2 wire bus protocol
F=RFU
b8=0
b7-b1=
Outside the scope
of 7816-4
000=
no indication
001=128
010=256
011=512
100=1024
101=2048
110=4096
111=RFU
0:
1:
Read to end
Read with defined length
00=
defined by ISO
10=structure 1
01=structure 2
11=structure 3
not defined
by ISO
1:
0:
DIR data reference
specified
DIR data reference
not specified
Figure 11 Answer-to-Reset for Synchronous Transmission Coding of Structure
http://www.belling.com.cn
-8-
Total
10 Pages
8/16/2006
BELLING [ SHANGHAI BELLING CO., LTD. ]
