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Altera_Forum's avatar
Altera_Forum
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14 years ago

Driving differential clock from Cyclone III Dev Board to daugther card

Hello, I am attempting to drive a differential clock out of the Cyclone III Development Board (EP3C120F780) to the "Data Conversion HSMC" daughter card. I want to clock data to a 14-bit DAC on...
Altera_Forum's avatar
Altera_Forum
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14 years ago

I don't exactly understand the problem. There should be no distance required between single ended and differential outputs. Distance rules only apply to differential inputs or bidirectional I/Os in relation to single ended outputs.

To implement a differential output, you don't need an ALT_OUT_BUF primitive, just assign the respective differential IO standard to the noninverted output of a differential pair.