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  4. AR# 64452: Vivado Implementation - Error:[Place 30-574] Poor placement for routing between an I/O pin and BUFG

AR# 64452

Vivado Implementation - Error:[Place 30-574] Poor placement for routing between an I/O pin and BUFG

Description

The following error occurred during place_design:


ERROR:[Place 30-574] Poor placement for routing between an IO pin and BUFG. If this sub optimal condition is acceptable for this design, you may use the CLOCK_DEDICATED_ROUTE constraint in the .xdc file to demote this message to a WARNING. However, the use of this override is highly discouraged. These examples can be used directly in the .xdc file to override this clock rule.

< set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets clk_IBUF] >

clk_IBUF_inst (IBUF.O) is locked to IOB_X0Y248
and BUFG_inst (BUFG.I) is locked to BUFGCTRL_X0Y31

What does it mean and how do I resolve it?

Solution

This message is flagging a sub optimal routing connection between an I/O pin and BUFG.

This is because this I/O is not a clock capable pin and so there is no dedicated clock routing between the I/O and BUFG.

To resolve this issue, either:


1) Move the clock input to a clock capable pin.

or

2) Add the "CLOCK_DEDICATED_ROUTE" to the XDC as mentioned in the message if the I/O location is not able to be changed and the sub optimal route on local resources is acceptable.
AR# 64452
Date 05/28/2015
Status Active
Type General Article
Tools