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8

Oki Semiconductor

Macrocells for Driving Clock Trees

Oki offers H-clock-tree drivers that minimize clock skew. The advanced layout software uses dynamic

driver placement and sub-trunk allocation to optimize the clock-tree implementation for a particular cir-

cuit. Features of the H-clock-tree driver-macrocells include:

• True RC back annotation of the clock network

• Automatic fan-out balancing

• Dynamic sub-trunk allocation

• Single clock tree driver logic symbol

• Automatic branch length minimization

• Dynamic driver placement

• Allows multiple clock trees

Clock

Figure 4. H-Clock-Tree Structure