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Adventurer
Adventurer
493 Views
Registered: ‎11-18-2017

Problem with Critical Warning [Constraints 18-5]

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When I open the FloorPlan Area/IO/Logic (PlanAhead), Critical Warnings appear as below

 

CRITICAL WARNING: [Constraints 18-5] Cannot loc instance 'dl/g_carry4[0].g_firstcarry4.cmp_CARRY4' at site SLICE_X8Y8, Routing contention at pips element DOUTMUX [C:/Users/John/Desktop/expand_test4/Carry_Delay_v3_for Timing Report Generate/carry_v.ucf:25]

CRITICAL WARNING: [Constraints 18-5] Cannot loc instance 'dl/g_fd[0].cmp_FDR_O_1' at site SLICE_X9Y8, Instance placement is not aligned with its shape [C:/Users/John/Desktop/expand_test4/Carry_Delay_v3_for Timing Report Generate/carry_v.ucf:122]
CRITICAL WARNING: [Constraints 18-5] Cannot loc instance 'dl/g_fd[1].cmp_FDR_O_1' at site SLICE_X9Y8, Instance placement is not aligned with its shape [C:/Users/John/Desktop/expand_test4/Carry_Delay_v3_for Timing Report Generate/carry_v.ucf:124]
CRITICAL WARNING: [Constraints 18-5] Cannot loc instance 'dl/g_fd[2].cmp_FDR_O_1' at site SLICE_X9Y8, Instance placement is not aligned with its shape [C:/Users/John/Desktop/expand_test4/Carry_Delay_v3_for Timing Report Generate/carry_v.ucf:126]

 

what dose these 2 errors means??

1. Routing contention at pips element DOUTMUX

2. Instance placement is not aligned with its shape

 

 

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Xilinx Employee
Xilinx Employee
368 Views
Registered: ‎05-08-2012

Re: Problem with Critical Warning [Constraints 18-5]

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Hi @kimjaewon

I will answer the questions in-line below: 

 

1. Routing contention at pips element DOUTMUX

Routing contention would mean that there are two logical nets that need to use the same physical resource, but cannot. This looks to be at the output of a SLICE site. 

2. Instance placement is not aligned with its shape

The shape refers to a PlanAhead internally generated relatively placed macro that helps the placer complete its task. The shape not being aligned would mean the constraints on the logical cells is not physically possible. I would check the constraints referenced.


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Don’t forget to reply, kudo, and accept as solution.
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Don’t forget to reply, kudo, and accept as solution.
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1 Reply
Highlighted
Xilinx Employee
Xilinx Employee
369 Views
Registered: ‎05-08-2012

Re: Problem with Critical Warning [Constraints 18-5]

Jump to solution

Hi @kimjaewon

I will answer the questions in-line below: 

 

1. Routing contention at pips element DOUTMUX

Routing contention would mean that there are two logical nets that need to use the same physical resource, but cannot. This looks to be at the output of a SLICE site. 

2. Instance placement is not aligned with its shape

The shape refers to a PlanAhead internally generated relatively placed macro that helps the placer complete its task. The shape not being aligned would mean the constraints on the logical cells is not physically possible. I would check the constraints referenced.


-------------------------------------------------------------------------
Don’t forget to reply, kudo, and accept as solution.
-------------------------------------------------------------------------

---------------------------------------------------------------------------------------------
Don’t forget to reply, kudo, and accept as solution.
---------------------------------------------------------------------------------------------