help me please.....

hi guyz,

i need help on the following topic. please help me.

I was trying to generate a 4-bit Baugh-Wooley multiplier and i did that. Then i was trying to optimize it.

I was trying to mannually locate the positions of the elements. I can locate/move all the elecments but i cant move/locate the Z-register. please tell me what is the problem?

i am adding the full code. Please help me.

thanks

When i tried to locate the position for z-register i got the following error.

ERROR:Pack:2811 - Directed packing was unable to obey the user design

constraints (LOC=SLICE_X2Y18) which requires the combination of the symbols

listed below to be packed into a single SLICEM component.