There is currently a proposed revision to the ISO to remove ambiguities and to ensure an effective method of operation for changing the protocol type. An APDU is an Application Protocol Data Unit, a TPDU a Transport Protocol Data Unit. If an APDU command response pair has been defined for T=0 and it has. ISO/IEC specifies the power and signal structures, and information exchange between an integrated circuit card and an interface device such as a.
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The proposed revision defines a new use for the TA2 interface byte which has a special role in the selection of communication protocols and parameters. Low level output voltage tr: If there is no compatibility, the contacts shall be desactivated. Other values of PI1 are reserved for future use.
This part specifies commands for application management in a multi-application environment. It is only send to indicate to the interface device IFD what to do. The interface characters specify physical parameters of the integrated circuit in the card and logical characteristics of the subsequent exchange protocol. Three types of procedure bytes are specified: If bit b2 is set to 1, the card shall use an extra guardtime of 12 etu for its transmssion of characters to the interface device.
During operations, the interface device and the card shall not both be in transmit mode. The choice of communication protocol for the ICC is still a hot topic and one has to consider what advantages can be offered by the block protocol and then to examine the price that must be paid.
The historical characters may be used to convey information relating to the life cycle of the card. High level output current Iol: Low level input voltage Vcc: The presence of the historical characters is indicated by the number of bytes as specified in the format character defined below.
The duration of the state H of the clock pulse can be any value between 10 us and 50 us ; no more than one clock pulse during reset high is allowed.
It codes over the least significant bits b4 to b1 the selected protocol type T as coded in TD bytes. Protocol type T ————— The four least significant bits of any interface character TDi indicate a protocol type T, specifying rules to be used to process transmission protocols. When the two ends are in non-matced transmit mode, the logic state of the line may be indeterminate. For internal clock cards: The PTS0 format character is encoded as shown in figure High level input voltage Vil: The numerical meaning corresponding to each information bit considered in isolation is that of the digit.
Jso receiver then shall expect a repetition of the disputed character see figure 8. This maximum is named initial waiting time.
smartcard – How does ISO T=0 work? – Stack Overflow
In order to read the initial character TSall cards shall initially be operated with fi in the range of 1 MHz to 5 MHz. Created inupdated inamended inupdated in In other words, either the command message contains data for the ICC or sio command request data from the ICC which is then included in the response.
Structure of TS, the initial character ————————————— The initial character TS provides a bit shynchronisation sequence and defines the conventions to code data bytes in all subsequent characters. If no character repetition is provided by the card, — The card ignores and shall not suffer damage from the error signal coming from the interface device.
Reset of the card when a synchronous answer jso expected.
ISO/IEC – Wikipedia
These parameters are used for defining the work etu elementary time unit. Post as a guest Name. This initial etu is used during answer to reset is replaced by the work etu during subsequent transmission. This shows the two possibilities of the direct and inverse convention. We will discuss this further in the communications section. We copied it from an older version that is available on the Internet. The command header consists of the following 5 bytes: The following five values are defined:.
In all other cases TCK shall be sent. Table 3 — Electrical characteristics of CLK under normal operation conditions.
The deactivation by the interface device shall consist of the consecutive operations: Should the interface device wish to effect any change to this situation then it must issue the PTS command. The format character TO provides information necessary to interpret the remaining answer to reset characters.
Organization, security and commands for jso. For the active low reset mode the IC should respond between and 40, clock cycles after the rising edge of the reset signal.
When no TC2 appears in the answer to reset, the default value of WI is The dialogue between the interface device and the the card shall be conducted through iao consecutive operations: The default values of these parameters are: Reset of the card With a card answering synchonously, the interface device sets all the lines to state Ido See figure 2.
An elementary time unit etu is the nominal bit duration used in the character frame. V N is an extra guardtime requested by the card.
When informations exchange is terminated or aborted unresponsive card or detection of card removalthe electrical contacts shall be desactivated.