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BACPAC, or the Berkeley Advanced Chip Performance Calculator, is a software program to explore the effect of changes in IC technology. The use enters a set of fairly fundamental properties of the technology (such as interconnect layer thickness, and logic depth) and the program estimates the system level performance of an IC built with these assumptions. Previous work in this area can be found in () and (), but these do not consider many of the effects of deep-sub-micrometre interconnect. BACPAC is based on the work in (). BACPAC uses analytical approximations for system properties such as delay and interconnect requirements. The intent is not absolute accuracy for a given design, but to show trends and effects of technology changes. ==Inputs to BACPAC== Interconnect *Number of routing layers *Pitches (center to center distance of each layer) *Resistivity of the wires *Dielectric constant of the insulators between the layers Device *Vdd, also called supply voltage *Vt, also called threshold voltage *Gate oxide thickness of the MOS transistors *Drain current *Fan-in (number of inputs for each gate, on the average) System-level *Block design size (number of gates in each block) *Silicon efficiency (depends on design style - custom, ASIC, gate array, and so on) *logic depth (number of gates between state elements) *Rent’s exponent (how the number of connections varies with block size - see Rent's rule.) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BACPAC」の詳細全文を読む スポンサード リンク
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