AR# 42665


MIG 7 Series - Why does the MIG Example Design fail in BitGen?


When I generate a bitstream for a MIG 7 Series Example Design, the following error message occurs:

"ERROR:Bitgen:342 - This design contains pins which are not constrained (LOC) to a specific location or have an undefined I/O Standard (IOSTANDARD).This maycause I/O contention or incompatibility with the board power or connectivity affecting performance, signal integrity or in extreme cases cause damage to the device or the components to which it is connected.To prevent this error, it is highly suggested to specify all pin locations and I/O standards to avoid potential contention or conflicts and allow proper bitstream creation. To demote this error to a warning and allow bitstream creation with unspecified I/O location or standards, you can apply the following bitgen switch: -g UnconstrainedPins:Allow."


This error message occurs when generating the bitstream for the MIG 7 Series Example Design when one or all of the system and status signals internally. If any of the pins are left as "No connect", the ISE tools select the pins as needed in the implementation phase.

For more information about the error message and how to downgrade this to a warning message, please refer to(Xilinx Answer 41615).

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
46227 MIG 7 Series Solution Center - Top Issues N/A N/A

Associated Answer Records

AR# 42665
Date 12/15/2012
Status Active
Type General Article
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