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144 www.xilinx.com Development System Reference Guide
Chapter 7: MAP
R
Because of the way signals are checked, make sure you don’t use an underscore as your
bus delimiter. If you name a bus signal data0_01 and a non-bus signal data1, MAP sees
them as data0 and data1 and register orders them even though you do not want them
register ordered.
Guided Mapping
In guided mapping, an existing NCD is used to guide the current MAP run. The guide file
may be from any stage of implementation: unplaced or placed, unrouted or routed. Xilinx
recommends that you generate your NCD file using the current release of the software;
however, MAP does support guided mapping using NCD files from the previous releases.
Note:
When using guided mapping with the –timing option, Xilinx recommends using a placed NCD
as the guide file. A placed NCD is produced by running MAP –timing or PAR.
The following figure shows the guided mapping flow:
Figure 7-3: Guided Mapping
X8995
MAP
NGD
Input Design
NCD
Mapped Design
NGM
Mapped Design
PAR
NCD
Placed and Routed Design
NGD
Modified Input Design
NCD
Guide File
NGM
Guide File
MAP
NCD
New Mapped Design
MDF
Decomposition
Hints
First MAP Run Second MAP Run