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Altera_Forum's avatar
Altera_Forum
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17 years ago

How does Quartus handle flip flop with both async reset and set

I have come to know that Stratix iii and Iv do not support async set ,so how in Quartus handles simulatanoous reset and set (async) ,I have heard that it uses latch but don't know exactly,Plz do clar...
Altera_Forum's avatar
Altera_Forum
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17 years ago

If you need asynchronous set and reset, there's no alternative to the combinational loop and xor solution used by Quartus, I think. I don't see a problem with the combinational loop as such, but the synchronous datapath is considerably slowed down by the additional LUTs. The additional resource and routing effort may be an issue with a large amount of set/reset FFs in your design.