Research And Optimization Of Crosstalk In Physical Design Of FT-XV Anti-radiation Multi-core Processor

With the constant shrinking of character size and the ever growing of frequency, crosstalk has now become the key problem in the physical design of deep submicron IC. The impact of crosstalk on circuit mainly manifested in two aspects:firstly, it will cause timing changing, resulting in the establishment of the setup time or hold time violations; secondly, it will cause glitch noise, which will seriously cause circuit function error.FT-XV is an aerospace design with multi-core processors, leaded by the National University of Defence Technology. Because it will be used in satellites, in order to work under complex electromagnetic environment stably, FT-XV must not only have a powerful anti-radiation capacity, but also have a strong anti-noise capability. Based on the background of FT-XV project, the paper carried out the study and optimization of the crosstalk problems encountered in the physical design of the processor and completed the main work as follows:1) Based on the130nm process, the paper used SPICE simulator to have a comprehensive study of the relationship between crosstalk and the coupling capacitance, the signal transition time and direction, the signal drive and the load capacity, the length of the parallel metal wire. And the paper obtained the changing of crosstalk effect of the above factors finally. These findings played a guiding role in the FT-XV processor physical design.2) This paper presented a set of physical design flow, which can control crosstalk effectually. It contained the prevention of crosstalk, analysis and repair. The crosstalk prevention was the heart of the entire design. Setting reasonable parameter during logic synthesis, controlling routing congestion and decreasing coupling capacitance during CTS will significantly reduce crosstalk.3) This paper used PrimeTimeSI tool to analysis the sign-off level crosstalk. Enhancing the drive of the cell and inserting the buffer were the main methods to repair the crosstalk.4) Ultimately, this paper finished the physical design of FT-XV and eliminated the adverse effect of crosstalk successfully. FT-XV has achieved the design goal of120MHz under the condition of prodigious delay due to anti-radiation design.