AR# 9481

4.1i Virtex MAP - Report shows slices usage is significantly higher than 2.1i/Device does not fit

Description

Keywords: 3.1i, MAP, slice, usage, report, overmap, fit, more

Urgency: Standard

General Description:
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.

Solution

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.
AR# 9481
Date 06/13/2002
Status Archive
Type General Article