Modeling Memories 135 4.2 Modeling Memory Functionality There are two distinct ways of modeling memory functionality. One is to use standard VHDL behavioral modeling methods. The other is to use the VITAL2000 memory package. Some features of the memory package can be used in behavioral models. Let us look at how to model a generic SRAM using each method. The component modeled is a 4MB SRAM with an 8-bit word width. 4.2.1 Using the Behavioral (Shelor) Method The model entity has the same general features as previous models. It begins with copyright, history, description, and library declarations: ------------------------------------------------------------- --File Name: sram4m8.vhd -------------------------------------------------------------