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.
| 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 | |