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4.1i Virtex MAP - Report shows slices usage is significantly higher than 2.1i/Device does not fit
Keywords: 3.1i, MAP, slice, usage, report, overmap, fit, more
The 4.1i/3.1i mapper may show a significant difference in the slice usage as opposed to the 2.1i MAP report. In some cases, the device does not fit.
Device utilization will return to 2.1i levels if the "-r" switch is used to turn off register ordering.
The difference is due to the fact that register ordering was not working properly in previous releases. It is now fully functional, but has an impact on density.
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