Research Of Engineering Application About SCI's Real-Time Performance

The aim of this task is investigating a high-speed network connection protocol—Scalable coherent interface (SCI), and applying it to fiber communication (FC) card. It is the further extension of the subtask of the 863 national projects in military industry: communication card in flight control, which held by the computer science department of Xiamen University and the national major laboratory in intelligent technology and system of Tsinghua University.This dissertation begins with introduction of SCI's basic protocol. SCI provides a ring-based network protocol with the logical operation of a bus. The high throughputs and low latencies associated with SCI make it a desirable platform for high speed communication. However, the base SCI protocol does not attempt to address real-time issues.Carefully studying SCI's performance in real-time system is the keystone of the dissertation. Comparing with the characteristic of real-time system, we put forward some deficiencies of SCI basic protocol. Priority inversion is one of the problems. To resolve inversion, we add directed flow control strategy (DFC) to SCI basic protocol, and give some examples to explain the principle of DFC. We compare real-time performance of DFC with SCI by some parameters. The result shows that the strategy resolves priority inversion with great efficiency. On the other hand we realize the DFC strategy by using Verilog (a kind of hardware description language). The emulation waves show that DFC strategy is feasible.Exploitation of driver for SCI communication card is the other content of this dissertation. Driver with windows driver model (WDM) is written with tools of DriverWorks. With the driver, Address can be set to the FC card. Thus the card can bypass data package when it's not the destination of data package.Finally, the thesis summarizes former work and put forward some advices to the further work.