IBIS Modeling(2)

Introduction of IBIS

Originally ibis is a word to name a kind of flying birds or sacred birds, while here IBIS is an acronym of I/O Buffer Information Specification. IBIS, proposed and applied first in Intel in 1990s, is such a behavioral model that can be simulated faster than transistor models and disclose property information to end-users. A standard IBIS file consists of several tables of data used to describe digital buffers, VI data, VT data, C-compensation data and other supplementary information (according to buffer case). Now there is a committee to set up and modify and update for IBIS standardalization (http://www.eigroup.org/ibis/default.htm).

Ibis是一种鸟的英文单词，大概是朱鹭或者别的什么长腿长嘴的鸟类。而在这里IBIS是一个缩略词，指的是输入/输出buffer的信息标准，大约在20世纪90年代时候intel开始使用IBIS模型。IBIS模型用来替代一些transistor的模型，这样作为芯片厂商就不用担心核心的工艺技术泄漏，因为IBIS模型只是一个数据表单。标志的IBIS模型一般包含VT曲线(用来描述buffer的动态特性)，VI曲线(用来描述buffer的静态特性)，C-comp(buffer的等效电容-不包含package的等效电容)以及一些附加选项。现在已经有一个为IBIS制定标准的组织。(http://www.eigroup.org/ibis/default.htm).