Browsing by Author "Cheng, Fu-Chiung"

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A Low-latency GALS Interface Implementation
(2010)
Chang, Yuan-Teng
;
Chen, Wei-Che
;
Tsai, Hung-Yue
;
Cheng, Wei-Min
;
Chen, Chang-Jiu
With the VLSI technology improving rapidly, SoC has been becoming the most important VLSI application. However, clock distribution and low power have already become the two most important issues in SoC design. In addition, it's also a very important issue to integrate IPs that can perform operations correctly with different clocks. Asynchronous circuits may resolve these problems by removing the "clock" signal. But it's too hard to implement the whole circuits with asynchronous circuit. The GALS (Globally-Asynchronous Locally-Synchronous) design methodology can balance this problem via separating each synchronous design with asynchronous interface. Thus, each part of the circuit can perform operations with its own clock. The communication between different parts of the circuit can be achieved via asynchronous channels. The GALS provides a reliable communication between different modules. However, the latency of GALS interface may cause performance degradation seriously. Thus how to reduce the latency of GALS interface is significant. In this paper, we implemented a small and simple stretchable-clock based GALS wrapper with low-latency in Verilog HDL and synthesized the design with TSMC 0.13 mu m cell library. We also showed that the wrapper can operate correctly with modules which operate with great different clock frequencies. In addition, we also recommend adding FIFO storage element on the transmission path.
Self-Timed Torus Network with 1-of-5 Encoding
(2009)
Chang, Yuan-Teng
;
Huang, Man-Chen
;
Cheng, Wei-Min
;
Tsai, Hung-Yue
;
Chen, Chang-Jiu
Nowadays, MPSoCs or multicore processors have been becoming the major trend of system or processor designs. Thus the design of interconnection networks becomes the most important issue of all. However, lots of different problems may arise in the network design and they should be carefully handled. It is widely known that most of these problems can be resolved easily by asynchronous circuits. But because of the difficulties of implementation, still only some real implementations of asynchronous networks. In this paper, we implemented a self-timed torus network with 1-of-5 DI encoding. The design was implemented in gate-level with Verilog HDL and synthesized with TSMC 0.13 mu m technology. The simulation shows that the network can operate correctly in 63.9 MHz.