UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 12255

6.2i NGDBuild, LogiCORE PCI/PCI-X - "INFO:NGDBUILD:757 - The constraint for NET '...' is being attached to the equivalent NET '...'"

Description

General Description: 

When I attempt to implement the PCI or PCI-X cores, NGDBuild reports the following warnings on several nets: 

 

For PCI: 

"INFO:NgdBuild:757- The constraint for NET 'PCI_CORE/RST_I' is being attached to the equivalent NET 'RST_N'." 

"INFO:NgdBuild:757- The constraint for NET 'PCI_CORE/AD_IO<31>' is being attached to the equivalent NET 'AD<31>'." 

 

For PCI-X: 

"INFO:NgdBuild:757 - The constraint for NET 'XPCI_WRAP/CLK_I' is being attached to the equivalent NET 'PCLK'." 

"INFO:NgdBuild:757 - The constraint for NET 'XPCI_WRAP/RST_I' is being attached to the equivalent NET 'RST_N'."

Solution

These warnings may be safely ignored. The UCF file constrains signals in the wrapper file instead of at the top level of the design. The wrapper file, XPCI_WRAP, is one level down in the hierarchy; therefore, the UCF constraint constrains signals using the hierarchy path. NGDBUILD recognizes these signals constrained in the UCF are equivalent to signals named in the top-level file ports. NGDBUILD applies the constraint to the signals at the top level, which triggers this information message.

AR# 12255
Date Created 08/29/2007
Last Updated 05/14/2014
Status Archive
Type General Article