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Home > FPGA Technical Tutorials > Design Recipes for FPGAs Using Verilog and VHDL > Memory > Modeling Memory in HDLs

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Modeling Memory in HDLs

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Great care must be exercised when modeling memory in HDLs. As some memory cannot be synthesized, if a model is used, it must reflect the correct physical behavior of the real device if it is off chip. This particularly applies to access times and timing violation conditions. If the timing is violated, then the data may be at best suspect and at worst totally useless. The designer can find themselves in the invidious position of having a simulation model that works perfectly, and real hardware that is completely nonfunctional. In this chapter, no physical delays have been implemented in the models, and these must be added if the models are to be used in a realistic system.

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