Forum Discussion
Altera_Forum
Honored Contributor
15 years agoCarl,
you create a ddr_out block with the MegaWizard PlugIn Manager, select ALTDDR_OUT in the 'IO' section. Driving the clocks out via ddr_out is useful when you are sending the clock along with DDR output data e.g. driving a RTBI (Reduced Ten Bit Interface) as found on some gigabit transceivers. This will keep your clock nicely aligned with the DDR data as then all signals have equal output circuits. I guess you can do this also with true differential signals, e.g. LVDS (I haven't done/tried this yet).