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AR# 64189

Vivado - Receiving the Error "[Place 30-73] Invalid constraint on register 'IO1_I_REG'. It has the property IOB=TRUE, but is not driving or driven by any IO element."

Description

In my design, a core is used which has IOB properties on some registers, but the core connectivity is such that the registers are not eligible for placement in an ILOGIC/OLOGIC location.

This results in the following Critical Warning:

[Place 30-73] Invalid constraint on register 'IO1_I_REG'. It has the property IOB=TRUE, but is not driving or driven by any IO element.


Can I suppress these warnings without changing the message severity?

Solution

To work around this issue, override the IOB=TRUE properties by applying IOB=FALSE to the registers involved.
AR# 64189
Date Created 04/08/2015
Last Updated 05/05/2015
Status Active
Type General Article
Devices
  • FPGA Device Families
Tools
  • Vivado Design Suite