AR# 51778

Zynq-7000 - How should the PS DDR3 CKE signal be terminated?

How should the PS DDR3 CKE signal be terminated?

For DDR3, CKE should be pulled to VTT via a 40 Ohm resistor, not pulled to GND via 4.7 KOhm as is used in DDR2.

This provides termination for CKE for self-refresh operations.

The Zynq-7000 SoC PCB Design and Pin Planning Guide (UG933) has been updated with this information.

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