Macro modified after Map ?


I manually made one MACRO (.nmc file), in V2P30, ISE 8.2.03,

for 16-bit AND function

using 8 slices.

Every LUT was manually programmed by "A1 * A2"

Strangely, after place and route (PAR),

I observe that some of LUTs in the MACRO are modified by

"A1 * A3" or "A2 * A4"

Though it is still "16-bit AND" function,

I do not understand who, why, how change these PIN information.

Is it because of routing congestion?

Does anyone have this experience?

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