By Yongquan Fan
High-Speed Serial Interface (HSSI) units became frequent in communications, from the embedded to high-performance computing platforms, and from on-chip to a large haul. trying out of HSSIs has been a not easy subject as a result of sign integrity concerns, lengthy try time and the necessity of pricy tools. Accelerating try out, Validation and Debug of excessive pace Serial Interfaces presents cutting edge try and debug ways and special directions on how one can arrive to useful attempt of contemporary high-speed interfaces.
Accelerating try out, Validation and Debug of excessive velocity Serial Interfaces first proposes a brand new set of rules that permits us to accomplish receiver try out greater than a thousand occasions speedier. Then an under-sampling dependent transmitter attempt scheme is gifted. The scheme can safely extract the transmitter jitter and end the total transmitter try out inside 100ms, whereas the attempt frequently takes seconds. The publication additionally offers and exterior loopback-based trying out scheme, the place and FPGA-based BER tester and a unique jitter injection procedure are proposed. those schemes will be utilized to validate, try and debug HSSIs with info price as much as 12.5Gbps at a decrease try out price than natural ATE recommendations. furthermore, the booklet introduces an efficieng scheme to enforce excessive functionality Gaussian noise turbines, appropriate for comparing BER functionality below noise conditions.
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Additional resources for Accelerating Test, Validation and Debug of High Speed Serial Interfaces
The jitter is injected to the clock signal through dynamically shifting its phase by an ATE device. Advantest has also developed a jitter injection module that can mix any modulated signal as a jitter signal with a carrier signal . Sunter et al. propose an alternative approach in  for the jitter tolerance testing. Instead of injecting jitter to the test signal, their approach uses on-chip undersampling to measure parameters that affect the jitter tolerance, such as highfrequency jitter in the received signal and the recovered clock.
The mathematical model of the AWGN channel is shown in Figure 2-12 . Channel + s(t) r(t) = s(t) + n(t) n(t) Fig. 2-12. AWGN channel model In the AWGN model, the transmitted signal s(t) is corrupted by noise n(t). The model can be expressed by r(t) = s(t) + n(t). The noise is introduced by the channel, as well as by electronic components, including amplifiers at the receiver. This type of noise is most often characterized as thermal noise, or statistically as Gaussian noise. Its PDF is expressed by p ( x) = 1 δ 2π e − ( x − mx ) 2 2δ 2 where mx is the mean and σ2 is the variance of the Gaussian random variable.
The most popular model used is the so called “double delta” model – assuming that the only DJ is DCD, whose PDF is only comprised of a pair of delta functions . 1 Introduction 49 mentary error function. The double delta assumption now serves widely as the model for modern bathtub curve fitting. Theoretically, the double delta model is not the most flexible one for arbitrary jitter profiles. Studies on the effect of the DJ profile when deviating from the double delta assumption show that there are limitations of the double delta model .
Accelerating Test, Validation and Debug of High Speed Serial Interfaces by Yongquan Fan