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Altera_Forum
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9 years ago

DDR3, time quest & afi_half_clk freq.

I've a project with a DDR3L SDRAM controller (quartus 15.1) , using a afi_half_clk = 350/2Mhz for the avalon the interface. The project is working, and if a compare a counter with a 125MHz and the af...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

You see in Time Quest what you should see. As I said afi_half_clk depends on controller rate (Afi ratio). If you configured your controler as a Half-rate and 350MHz, then your afi_half_clk = 350/4 and Time Quest should report afi_half_clk = 87.5. If you want clock that is half of the interface use afi_clk not afi_half_clk.