Answers Database

7318/7336 inverted input in UIM causes warning 205


Record #270

Product Family:  Software

Product Line:  EPLD Core

Problem Title:
7318/7336 inverted input in UIM causes warning 205


Problem Description:
When compiling a design for 7318/36, FITEQN gives the following warning
message:

es205:[Warning]The partitioner cannot place node 'D' in the uim
     because of polarity restrictions on the following input(s):
     A	C
     Node 'D' will be placed in a macrocell instead.
     Additional time delay introduced.


Solution 1:

The XC7318 and XC7336 do not have inversion capability on input pins (i.e.,
they cannot invert input signals as they enter the chip).

If an equation is declared as a NODE (UIM), and the equation contains inverted
input pin signals, this warning will be issued and the node will not be placed
in the UIM.

Do not declare UIM nodes that contain inverted input pin signals in XC7318
and XC7336 designs.



End of Record #270