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AR# 52013

Zynq-7000 AP SoC, Boot Sys - PS_SRST_B asserted during a POR boot does not result in a secure lockdown

Description

In all silicon revisions, the boot process caused by the PS_POR_B reset signal must not be interrupted by the assertion of the PS_SRST_B reset signal.

In pre-production silicon, the system may not lock down securely and the results are unpredictable.

In production silicon, the system will lock down if PS_SRST_B is asserted while the BootROM is executing after a POR reset.

Refer to UG585 TRM v1.7 or later, chapter 6 for a discussion.

Solution

The result of this situation is not well defined. The design intention in this situation is to cause a secure lockdown condition.

Impact: Minor.
Work-around: The system designer should design and operate their system to ensure that this scenario does not occur.
Configurations Affected: All.
Device Revision(s) Affected: Refer to (Xilinx Answer 47916) Zynq-7000 AP SoC Silicon Revision Differences.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
47916 Zynq-7000 AP SoC Devices - Silicon Revision Differences N/A N/A

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
52847 Zynq-7000 Board Design - Sequencing for SRST and POR Signals N/A N/A
AR# 52013
Date Created 10/25/2012
Last Updated 11/26/2013
Status Active
Type Design Advisory
Devices
  • XA Zynq-7000
  • Zynq-7000
  • Zynq-7000Q