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In transmission ( "tx" ) over the GXB, Quartus offers (for pins G2-G1 or C2-C1) only "1.5-V PCML" or 2.5V default. I am seeing that only 1.5V-PCML has differential output. Can I from my VHDL code write to this channel then?
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Yes, you can write VHDL to control those channels. Whether or not you can do that directly with VHDL, or indirectly via ALTGX is one question. Quartus can answer this for you; just try it.
However, you indicated you want to communicate with an LVDS component. You would need to confirm whether PCML levels are compatible with your "LVDS" component. For example, it might be able to support more than just LVDS logic levels. I often use Micrel parts that have 'Any Differential' inputs.
If you are transmitting an encoded signal, then you might be able to AC-couple the PCML output and LVDS receiver.
Without knowing what you are actually trying to communicate with, its a bit hard to offer suggestions. Try to explain your application in a bit more detail.
Cheers,
Dave
Honored Contributor
