HC1S25 Datasheet, PDF (107/110 Pages) Altera Corporation – HardCopy Stratix Device Family

Design Guidelines for HardCopy Stratix Performance Improvement
Figure 6–7. Critical Path and LogicLock Region
Fly Lines in Zoomed-In
Portion of Floorplan
Using the critical path “fly lines” as a guide for placement optimization,
manual location assignments were made for some of the M512 and M4K
instances used in the design. The resulting compile improved the f_MAX to
94.67 MHz. The new critical path (Figure 6–8) shows how placement of
all path elements are confined to a much smaller area. As a result, the
routing distances and delays are smaller through the path.
Altera Corporation
September 2008
6–19