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xilinx:map [2014/06/13 15:03]
mcmaster-guest
xilinx:map [2014/06/13 15:04] (current)
mcmaster-guest
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 <​code>​ <​code>​
-The "​S"​ property is the correct property to use to block logic trimming. The functionality of the "​S"​ property was expanded in ISE 10.1 software so that it will also block constant optimization from propagating through the net and logic connected to a net with an "​S"​ property will not be removed. Also, "​S"​ properties can be applied directly to logical instances to prevent their removal.+The "​S"​ property is the correct property to use to block logic trimming. ​ 
 +The functionality of the "​S"​ property was expanded in ISE 10.1 software ​ 
 +so that it will also block constant optimization from propagating through ​ 
 +the net and logic connected to a net with an "​S"​ property will not be removed. ​ 
 +Also, "​S"​ properties can be applied directly to logical instances to prevent their removal.
  
-The "​KEEP"​ net property has a different purpose and can be thought of as a packing constraint. It is used to keep a signal from being entirely merged into a component so that the signal would not exist in the physical design. It has no effect on the trimming of unused logic or on constant optimization. It can be used to control packing behavior, but only to the extent that it blocks packs that would otherwise cause the signal to disappear.+The "​KEEP"​ net property has a different purpose and can be thought of as a packing constraint. ​ 
 +It is used to keep a signal from being entirely merged into a component ​ 
 +so that the signal would not exist in the physical design. ​ 
 +It has no effect on the trimming of unused logic or on constant optimization. ​ 
 +It can be used to control packing behavior, but only to the extent that it blocks packs  
 +that would otherwise cause the signal to disappear.
 </​code>​ </​code>​
  
 
xilinx/map.txt · Last modified: 2014/06/13 15:04 by mcmaster-guest
 
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