Abstract: A new point-to-point Global Asynchronous Local Synchronous(GALS) interface is developed. With an unsymmetrical handshake protocol, the communication between the interfaces is realized. And an FIFO is embedded into the datapath of the interfaces. The time utilization of the unsymmetrical interface is more effective than that of traditional symmetrical interfaces. And the interface can achieve high-speed continuous data transmission. Based on the 0.25μm CMOS processes, the highest rates of the sender and the receiver can reach 670MHz and 1.45GHz respectively. The unsymmetrical interfaces can be applied to the System On Chip(SOC) design of the high-speed data rate.

Key words: global asynchronous local synchronous(GALS), unsymmetrical, syn-asyn interface