简体繁体 English

智能卡中的 APDU/Response 对之间是否有任何时序规范？

[英]Is there any timing specs between APDU/Response pair in smart card?

原文 2020-09-14 16:15:37 7 1 embedded/ smartcard/ iso-7816-4

I couldn't find a clear specification about the period between two consecutive Command/Response Pair (T in the diagram).我找不到关于两个连续命令/响应对（图中的 T）之间的周期的明确说明。

for example, If I had sent a command to the card and received a response, What is the maximum period I can wait before the communication is not valid anymore?例如，如果我向卡发送了一个命令并收到了响应，那么在通信不再有效之前我可以等待的最长时间是多少？ I need this because I'm willing to make use of this period to give me some flexibility in my design.我需要这个，因为我愿意利用这段时间在我的设计中给我一些灵活性。

1 个解决方案

This is the block waiting time (which can be computed from the BWI part of TB3 in the ATR).这是块等待时间（可以从 ATR 中 TB3 的 BWI 部分计算）。 If the card needs more time, it has to send a Waiting Time Extension (abbreviated WTX), before this elapses, which has to be acknowledged by the other side (typically the reader).如果卡需要更多时间，它必须在此时间结束之前发送等待时间扩展（缩写为 WTX），必须由另一方（通常是读卡器）确认。 If the acknowledge is not given both sides assume a communication error.如果未给出确认，则双方假定通信错误。

Note, that FWI and BWI from TA1 as well as the clock supplied to the card influence the time.请注意，来自 TA1 的 FWI 和 BWI 以及提供给卡的时钟会影响时间。