Classic Scenarios

This section discusses classic coding scenarios for DC. Unlike the classic scenarios discussed in chapter 1, these are useful to all designers writing HDL code for synthesis using DC. 

You wish to infer logic which models a parity detector. In other words, you have an incoming databus, whose parity when odd, returns a 1, and a 0 when parity is even. In order to reuse the code irrespective of the bus length, you wish to write a fimction and use the function to infer the logic. 

The following example shows one way of coding the above, to realize the parity detector. 

Note the modulus operator requires constant operands in verilog. Hence cannot be 

How does one code a mod N counter with terminal count. 

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The adsorption and desorption isotherms have been calculated for the Nj sorption at 77K in cylindrical pores of MCM-41 materials in the range 1-12 nm. The points of spinodal and equilibrium transitions are plotted in Fig. 2. There are several features worth noticing. As the pore size increases, the line of spinodal desorption saturates at the value corresponding to the spinodal decomposition of the bulk liquid. The line of equilibrium capillary condensation asymptotically approaches the Kelvin equation for the spherical meniscus and the line of spontaneous capillary condensation asymptotically approaches the Kelvin equation for the cylindrical meniscus. This asymptotic behavior is in agreement with the classical scenario of capillary hysteresis [12] capillary condensation occurs spontaneously after the formation of the cylindrical adsorption film on the pore walls while evaporation occurs after the formation of the equilibrium meniscus at the pore end. Most interestingly, the NLDFT predictions of equilibrium and spontaneous capillary condensation transitions for pores wider than 6 nm are approximated by the semi-empirical equations of the Deijaguin-Broekhoff-de Boer theory [13]. 

A recent model has been suggested by Hachisu et al. (1996, 1999) and is based on the classical scenario of Whelan Iben (1973) but with a metallicity effect. It predicts that no Type la systems can form for [Fe/H]< —1.0. This model seems to have some difficulty in explaining the low [a/Fe] ratios observed in Damped Lyman- a systems (DLAs) which show that even at low metallicities is present the effect of Type la SNe. Recently, Matteucci Recchi (2001) showed that there are some problems with this scenario also... 

In this section, we describe a few classic scenarios faced by designers when using DC. This section is especially useful for designers new to DC. 

In this section, we discuss a few basic simulation related classic scenarios. The simulator used is Synopsys VSS. 

The chapter begins with a brief introduction to test synthesis. This is followed by a description of the specific steps involved in test synthesis using TC. Then, several design specific issues which impact the approach to test synthesis are described, followed by tips for users. Finally, discussions on several classic scenarios faced hy designers when using TC are provided. 

Chapter 8 covers the concepts of testability and how they can be incorporated into the synthesis design flow. This chapter focuses on testability using the Synopsys Test Compiler (TC). Guidelines to be followed when using the TC are outlined. Again, several classic scenarios have also been discussed. 

The characteristic symptoms of infant botulism are poor sucking, constipation, generalized weakness, floppy appearance, and respiratory insufficiency (Cox and Hinkle, 2002). Infant botulism may quickly progress to respiratory failure if not treated. The development of the intestinal flora has been demonstrated to suppress the germination and growth of Clostridium botulinum spores in mice (Sugiyama and Mills, 1978). Ingestion of honey by infants is the classic scenario cited in infant botulism therefore, honey is not recommended in this susceptible population (Amon, 1998). 

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