Bo-Gwan Kim

Binary-Truncated CDMA-Based On-Chip Network

This paper presents a new communication network for on-chip interconnection. The network concentrates on small size communication link, non blocking effect, scalability. The network is based on a direct sequence code division multiple access (DS-CDMA) technique with a binary-truncated channel. By the truncation, the network drastically reduces data transfer lines. The network architecture is largely divided into four modules: a CDMA-based network interface, an interconnection module, a synchronizer, and a hub network interface. Especially the network includes a reverse channel for the efficiency of packet flow control. The authors guarantee the scalability of network by both a PN-code reuse and a hierarchical structure. The authors also decouple functional and communication tasks for scalability and utilize a modular architecture for flexibility. The network architecture is analyzed in terms of performance, area, and physical architecture. The network is done using fully synthesizable Verilog HDL to enhance the portability between process technologies.

A technology migration method using rectangle-based layout conversion

This paper proposes a new and efficient method for layout migration. In the method, we achieve technology retargeting by optimizing objects and handling hierarchical structure. Circuit elements in the layout are defined as objects. The objects are represented by a set of connected or overlapped rectangles. The object based process in hierarchical structure supports easy handling of circuit elements through the migration process. Experimental results demonstrate the effectiveness of our method on actual layouts. The used layouts in the experiment include simple standard library cells and more complex hierarchical macro blocks composed of standard and custom cells.