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My design fails to route successfully.
What should I look for to resolve this issue?
When route fails to successfully route all/few of the signals, the root cause can be one of several things including:
Debug technique:
Identify the unroutable net(s) involved
The router will have done one of several things:
1. Router ran to completion with one or a few unrouted nets without any warning messages about those nets.
The details about the routing can be found from the route status report file.
2. Router printed warning about unroutable nets and then ran to completion with one or a few unrouted nets.
Refer to the Place and route.log file for the warning messages.
Below is a list of the top 10 physical nodes with signal overlaps and upto 5 of the signals that were contending for this node resource:
1. Tile Name: INT_R_X113Y175 Node: FAN_ALT5 Overlapping Nets: 2
U_L2PP_CORE/PP_EG_VLAN_CAM_REFCLK0
U_L2PP_CORE/PP_IL_REFCLK1
2. Tile Name: INT_R_X113Y175 Node: FAN_BOUNCE5 Overlapping Nets: 2
U_L2PP_CORE/PP_EG_VLAN_CAM_REFCLK0
U_L2PP_CORE/PP_IL_REFCLK1
3. Router printed error messages and then stopped without attempting to complete the design.
Refer to Place and route.log file for the warning messages.
ERROR: [Route-3] Design is not routable as its congestion level is 7.
Examine the unrouted net in Device Editor
Open the implemented design in Vivado and find the list of unrouted nets using Find (refer to the below screen capture).
Highlight the unrouted nets and then zoom in on them to examine the pin connectivity involved.
After selecting the unrouted net, you can examine the connectivity in the net properties window as shown below:
Common issues to look for
Answer Number | Answer Title | Version Found | Version Resolved |
---|---|---|---|
54795 | VIVADO IMPLEMENTATION - How can I fix Partial Antenna problems, [Drc 23-20] | N/A | N/A |
AR# 53854 | |
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Date | 06/09/2015 |
Status | Active |
Type | General Article |
Devices |
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Tools |
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