Developing a new product

[DAVIT DAVIT]

Hi,
I am student from tbilisi, Georgia. working for a startup. our idea is to combine different kind of NFC cards functions into the one ring. But there are some problems we are facing currently, transportation card and gym membership, both requires their security codes to be written in the same sector of the chip, which makes impossible to implement our idea, another problem is that we can only use Mifare classic 1kb chip, as the transportation system in tbilisi has no support of other kind of chips, but as our test results show mifare classic has no enough signal strength when it is coiled for the ring size. I would love to know if there is any possibility to implement our idea?

Best Regards,

David Kvitsiani

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[mifaresdk]

Hi David,

Both want to use the same sector? To avoid collisions you can implement a directory where you can find the destination sector for the requested application. Maybe this document gives an idea:

http://cache.nxp.com/documents/application_note/AN10787.pdf

I do not know your particular reader implementation, but basically the signal strength is controlled from the reader terminal and not from tag.

Kind regards,
The MIFARE Team

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[DAVIT DAVIT]

Thanks for the reply.

yes, some of the sectors they use, are the same. Transportation company blocks the sectors, which they use for security. Does MAD is the solution even in this case?

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[mifaresdk]

Hi David,

The AN10787 describes a mechanism to implement a "directory structure". What I know is, it is used by some card application implementers. But if one user expect to operate on a dedicated sector and this clashes with another project requirements, a MAD will not help you.

You do not have this kind problems with the MIFARE DESFire because of the flexible architecture.

The MIFARE Team

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[Edison Konopelski]

Informative.

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