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Altera_Forum's avatar
Altera_Forum
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14 years ago

ALTGX on Cyclone IV GX

Hi, i hope any one replay to this.... i would like, to implement the transceiver interfaces on the Cyclone IV and if i do this an connect the Transceiver interfaces as an Loop on the Board, ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hello,

from your screenshot it looks like you are using a 25 MHz clock? To my knowledge, the minimum pll_inclk for the ALTGX Megafunction is 50 MHz (and should be connected to one of the dedicated, differential clock inputs).

At least for my Cyclone IV GX project, the MegaWizzard reports an error when an input frequency of less then 50 MHz is configured.