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Altera_Forum's avatar
Altera_Forum
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10 years ago

what kind of refclk standard do alt2gxb need?

I use ArriaGX in a PCIe design, and use ICS9DB403 to generate 100MHz refclk for alt2gxb. But GXB cannot receive any refclk signal. ICS9DB403 generate a HSCL standard signal. I wonder if alt2gxb cou...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

HCSL standard is used for PCIe refclk and works well with ArriaGX. An external termination (2x50 ohm to ground) is required.

I see this settings in a PCIe card project 

GXB_REFCLK_COUPLING_TERMINATION_SETTING "DC COUPLING EXTERNAL TERMINATION"
IO_STANDARD "1.2-V PCML"