Improved I/O pad positions assignment algorithm for sea-of-gates placement

• Main Author: Her, Shyang-Kuen
• Format: Others
• Published: PDXScholar 1992
• Subjects: Computer input-output equipment > Design and construction; Computer algorithms; Gate array circuits > Design and construction; Semiconductors > Design and construction; Electrical and Computer Engineering
• Online Access: https://pdxscholar.library.pdx.edu/open_access_etds/4316; https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=5326&context=open_access_etds

A new heuristic method to improve the I/O pad assignment for the sea-of-gates placement algorithm "PROUD" is proposed. In PROUD, the preplaced I/O pads are used as the boundary conditions in solving sparse linear equations to obtain the optimal module placement. Due to the total wire length determined by the module positions is the strong function of the preplaced I/O pad positions, the optimization of the I/O pad circular order and their assignment to the physical locations on the chip are attempted in the thesis. The proposed I/O pad assignment program is used as a predecessor of PROUD. The results have revealed excellent improvement.