AR# 51778

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

Description

How should the PS DDR3 CKE signal be terminated?

Solution

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.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
52540 Zynq-7000 SoC - Frequently Asked Questions N/A N/A
AR# 51778
Date 05/17/2018
Status Active
Type General Article
Devices
Boards & Kits