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Altera_Forum
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19 years ago

help about cycloneII!!!!

hi all I'm using the cycloneII(EP2C20Q240C8).I want to know how to use the pin of PLL_OUTn IN the pin sheet,pin description of PLL_OUTn is:Optional negative terminal for external clock outpu...
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Altera_Forum
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19 years ago

Hi dd412,

in Cyclone and Cyclone II devices the PLL_OUTn pins can not be used as single ended clock output. Ths means that you cann only use PLL_OUTp pins to route PLL signals out to the PCB when using single ended output standards like lvcmos or lvttl.

The other thing is, that you can use the PLL_OUTn and PLL_OUTp pins only as clock LVDS-Pair when using LVDS standard, not as LVDS-User I/O.

When using single ended I/O standards you can use the PLL_OUTn pins as user I/O

Christian