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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
Icon for Honored Contributor rankHonored Contributor
17 years ago

For your curiosity -

It will build a register with XORs on the D and Q side, controlled by a latch. The easiest way to think of it is that the latch controls whether the register is active high or active low. Presetting will clear and make the register active low. Clearing will clear and make the register active high. Multiple registers with the same secondarys can share one latch.

For your coding style / sanity -

Don't do that.