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Altera_Forum
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17 years ago

Stratix III alt_lvds Timing Requirements not met in speedgrade C2

Hi there, it's me again with the Stratix III ;) I'm currently using a Stratix III with speedgrade C2 (the one mounted on the Altera Stratix III DSP Kit) and want to use the alt_lvds function ...
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Altera_Forum
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17 years ago

Hi lestard,

I'm having a similar problem using Stratix III with a DDR3 SDRAM interface. In AN436 (page 53) I found the following notation:

"The Quartus II software v8.1 has a bug that results in an incorrect calculation for the toggle rate for differential I/O standards."

I'm going to submit a service request. Maybe you could do likewise, and we'll see if there is a patch for this in advance of the next Quartus release.

BTW, do you know when the next Quartus release is scheduled?

Regards,

Ron