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Altera_Forum
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15 years ago

Improving the performance of LVDS DDR at 200MHz

I am trying to improve the performance of an LVDS DDR interface. I currently use DDIO registers to create a DDR interface and then send it out via LVDS. I have 33 DDR channels with one latching...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The True LVDS ports can also be emulated LVDS, which is what I think you're doing. True LVDS has to be created with the altlvds_tx block, and it is analyzed with TQ's "Report TCCS" command. You'll find that command gives almost no information(the TQ User Guide I put together explains this), just a TCCS of 100ps. The device handbook discusses TCCS in more detail too. But what I think you're looking at is emulated LVDS on a True LVDS channel. (Yes, I don't think it could have been made more confusing if they tried.)