One more thing:

>
> It is so weird to let the dependency exist from bottom to top.

In fact, I do not think that's not a dependency. That just means that
T=0 is unable to transfer a case 4 command at once.
The fact that the direction of the transfer MUST be known prior to the
transfer also implies that you must know the response length.

If the response length is not what the card expected, there is no way
to make the host and the card agree on the action to be taken. So
instead of relying on timeouts, the designers preferred to be sure of
the transfer length. So if the transfer length is not OK for BOTH the
host and the card, the latter one sends 61 or 6C as SW2, so that the
host can agree with the card, or abort the transfer.

Sebastien
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