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Altera_Forum
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14 years ago

How can I get the signal from differential I/O pins

Hi, I need help. I use differential I/O pins input. " dcoin_p", "fcoin_p", "data_ai_in_p", "data_aq_in_p" are the positive pins, and I define then in my program. But the negetive pins are not d...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

As Socrates says, set the pin as an LVDS input, but I assume you've already done this as the fitter is automatically creating the negative version. You don't need to get the dcoin as (dcoin_p - dcoin_n) - that's basically done for you by the I/O circuitry, so dcoin_p is the signal you want. I don't know what the I/O circuitry does if dcoin_p = dcoin_n.