SLE4440 Datasheet, PDF (9/14 Pages) Siemens Semiconductor Group – ICs for Chip Cards / Intelligent 256/64/128-Byte EEPROM

SLE 4432
SLE 4442
SLE 4440
SLE 4441
2.2.
Extended Coding Scheme
Due to the available memory space the coding principle according to ISO/IEC 7816-4 applies for
SLE 4432, SLE 4442, SLE 4440 and SLE 4441. Data are coded according to the ASN 1 data
objects basic encoding rules using the structure Tag - Length - Value (BER TLV).
ATR header
ATR data
DIR data
APPLICATION data
RID PIX
H1 H2 H3 H4 TM LM ICM ICT ^{. . .} TA LA
LM
AID
TD LD
...
LA
LD
AID
ATR
DIR
H1,H2
H3,H4
Application identifier
Answer-to-Reset
Directory
ATR protocol bytes
ATR historical bytes
LA Length of AID
LD Length of application data area
PIX Proprietary appl. identifier extension
RID Registered appl. provider identifier
TA Tag of AID = ´4F´
TD Tag of application data area
Figure 5 Structure of a Mono- Application Memory IC Card with a simple DIR-Structure
Two coding principles apply
• Extended Coding Scheme (Compressed)
H1 H2 H3 H4 TM LM ICM ICT TA LA
RID PIX
• Extended Coding Scheme (according to German Health Insurance)
H1 H2 H3 H4 TM LM ICM ICT … TT LT TA LA RID PIX
The byte definition is explained in the following:
ATR header
Byte H1: Protocol type = ‘A2’ indicating two-wire link protocol
Byte H2: Protocol parameter
Byte H3: Historical byte “Category Indicator” = ‘10’ indicating that the following byte H4 will be a
DIR data reference
Byte H4: Historical byte “DIR data reference” = a pointer (byte address) to the first byte of the
directory section (i.e. TA for Extended Coding Scheme - Compressed or TT for
Extended Coding Scheme - according to German Health Insurance)
Semiconductor Group
9
Data Sheet Extension 09.98