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This is a question related to T=1 protocol for smartcard. The scenario is as follows: The interface device has to send, say 5 chained I-blocks to the card. So the M-bit is set for the first four blocks and cleared for the last one.

Can the card, say during the transfer of 2nd I-Block send an IFS or WTX request as a response? OR the card MUST reply with R-blocks always for chained I-Blocks.

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Instead of IFS or WTX You have to send (ISO-speak shall) a R-block with either positive or negative acknowledge. This should work for you

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