This chapter provides an overview of the cost models in terms of size, area, band-width, and power, as used in this book. In practice, timing issues are addressed as constraints and the cost function is mainly composed of area and power related terms. For memories, it is usually feasible to obtain closed-form formulas for the area and power in terms of the main parameters: number of bits, number of words, postdecoding (folding) factor, number of ports (R, W and RAV). Of course this model will heavily depend on the type of memory: SRAM, DRAM, SDRAM, Pointer-Addressed Memory, Video-RAM and so on. The parameters are not accurately available in each step of the DTSE methodology but they can always be estimated, albeit only crudely in the early steps.
Unable to display preview. Download preview PDF.