ZedBoard HW Users Guide - Digilent Reference
Aug 01, 2012 · DDR3 on the PS was routed with 40 ohm trace impedance for single-ended signals, and DCI resistors (VRP/VRN) as well as differential clocks set to 80 ohms. Each DDR3 chip needs its own 240-ohm pull-down on ZQ. DDR-VDDQ is set to 1.5V to support the DDR3 devices selected. DDR-VTT is the termination voltage which is ½ DDR-VDDQ.
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