Yang Lisheng

DLL-based multi-FPGA systems clock synchronization

This paper analyzes the feather of clock synchronization in FPGA, which shows, through the rational use for internal particular clock resources: the DLL and clock tree, FPGAs internal clock skew is reduced to negligible level, which not only realizes on-chip clock synchronization, but also achieves the real clock synchronization when communicating with external devices. This paper also gives a multi-FPGA systems clock synchronization program, in which the input clock is entered into a certain FPGA and the internal DLL is used to generate multi-output clock signals synchronized with the input clock, through reasonable circuit wiring, these signals, respectively, as the clock signal inputting every piece of FPGA, which finally realizes the system clock synchronization.

Answering-measure radar for expressway automotive anti-collision system application

Based on the characteristic of closure management for expressway and the demand of low cost for economic car in China, a new automotive anti- collision managing model is proposed, which can be implemented by the supervisory and managerial department. A scheme for automotive anti-collision radar is given based on answering-measure, some critical performances of the radar have been analyzed and the measuring performance of radar is tested, according to the testing result, the radar realizes the function of measuring and automotive anti-collision in expressway.