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Top-Down Layout for Hierarchical Custom Design
November/December 1987 (vol. 4 no. 6)
pp. 22-29
K. Ueda, LSI Laboratories, NTT
H. Kitazawa, LSI Laboratories, NTT
T. Adachi, LSI Laboratories, NTT
I. Harada, LSI Laboratories, NTT
Champ, a chip floor-plan program, and Alpha, an automatic cell placement and routing system, provide a method for hierarchicalcustom VLSI design that is highly automated and completely top-down. The system can handle standard cell blocks as well asmacro cells such as RAMs, ROMs, PLAs. Champ consists of initial block placement and block packing Designers can execute initialblock placement either manually or automatically using a method based on attractive-repulsive forces. Block packing is performedautomatically or interactively through the moving and reshaping of blocks, which is done as the chip boundaries are beingshrunk. Following the floor-plan design, Alpha automatically executes cell placement and routing. Using Champ/Alpha, onlyseven mandays are needed to design a 20,000-gate VLSI layout, using a predesigned standard cell library and predesigned macrocells.
K. Ueda, H. Kitazawa, T. Adachi, I. Harada, "Top-Down Layout for Hierarchical Custom Design," IEEE Design & Test of Computers, vol. 4, no. 6, pp. 22-29, Nov.-Dec. 1987, doi:10.1109/MDT.1987.295214
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