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AR# 57930

Design Advisory for Zynq-7000 SoC - Boundary Scan test fails when VMODE is set to 1.8V


Boundary Scan tests for PS MIO inputs may fail on Zynq-7000 devices when the PS MIO banks VMODE is set to 1.8V and VCCO is connected to a 1.8V supply.

Designs Affected

Any Zynq-7000 device attempting to perform a Boundary Scan EXTEST command when VMODE[1:0] is set to 1.8V with a VCCO of 1.8V. 

A VMODE[1:0] of 1.8V corresponds to a MIO[8:7] setting that does not equal 00.

Typically, boundary tests are used during pre-production or production board tests.



While running Boundary Scan EXTEST commands, VMODE must have been set to 2.5V/3.3V at power-on/reset, even if using a 1.8V VCCO voltage. 

Operating the I/Os at 2.5V/3.3V is safe and will not damage the I/Os during operation when VCCO is set to 1.8V.

A jumper or other ability to change the VMODE setting is required on the board if Boundary Scan tests are desired with a 1.8V MIO VCCO voltage.

The Zynq-7000 All Programmable Technical Reference Guide (UG585) will be updated starting in version 1.8.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
47915 Design Advisory Master Answer Record for Zynq-7000 AP SoC Devices N/A N/A
AR# 57930
Date 04/28/2014
Status Active
Type Design Advisory
  • Zynq-7000
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