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The sopc builder software used to cache the timestamp (or similar) from the board instead of re-reading it.
Quite possibly something similar still happens.
It is a shame that the Altera eample about using custom intructions just tells you how to click the buttons to add/remove the ones they supply.
The source for one that implements add would be more useful!
I wrote a combinatorial one that uses the 5 bit rB field to choose between various bit and byte reversals.
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Thank you, dsl.
I use Qsys in QuartusII 13.0.1: I don't know if such a problem affects even this software. I will check.
These problems are, for sure, my fault. But, quite frankly, Altera documentations on c.i. seems not to be very useful. If I solve this issue I must implement a c.i. that use conduit interface: I haven't found anything useful on documentation about that. Boh..
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