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Observer tamasgy89
Observer
11,260 Views
Registered: ‎03-27-2008

site definition - partition

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Hi,

 

   I would like to know what is a site and how does it relate to slices, components, FFs, LUTs (if it does...).

   I'm referring to a warning message which usually occurs when implementing with partitions:

"WARNING:Place:1178 - 938 sites were unavailable during the placement phase because they were already used by routing within preserved Partitions...
", and I don't understand from where does that number 938 come from.

 

Thanks in advance,

Tamas

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Xilinx Employee
Xilinx Employee
17,712 Views
Registered: ‎08-29-2007

Re: site definition - partition

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Tamas,

 

The sites that are unavailable are sites that are used for routing by a Partition that is being imported.  This message is useful if you run into a situation where the design will not finish routing or place.  If there is a Partition that is causing alot of sites to be unavailable, you might want to re-implemente that Partition or set the Preservation Level to synthesis which will allow minor changes in placement or routing.

 

I am monitoring the Hierarchical Design forum if you want to post future questions about Partitions there.

 

Kate

 

 

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Xilinx Employee
Xilinx Employee
11,235 Views
Registered: ‎12-17-2007

Re: site definition - partition

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Tamas,

 

In this context, a site is any location inside the device.  A site could be a Flip-Flop, LUT, MUX, DCM, BRAM, MULT18, etc.  This particular message is telling you that 938 sites were un-available for general purpose use because they exist inside of a partition region.  If you're not using all of the region blocked off by your partition, then you could make the partition region smaller to free up some of those sites for general purpose placement/routing.

 

-Tony 

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Xilinx Employee
Xilinx Employee
17,713 Views
Registered: ‎08-29-2007

Re: site definition - partition

Jump to solution

Tamas,

 

The sites that are unavailable are sites that are used for routing by a Partition that is being imported.  This message is useful if you run into a situation where the design will not finish routing or place.  If there is a Partition that is causing alot of sites to be unavailable, you might want to re-implemente that Partition or set the Preservation Level to synthesis which will allow minor changes in placement or routing.

 

I am monitoring the Hierarchical Design forum if you want to post future questions about Partitions there.

 

Kate

 

 

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