GB/T 20296-2012 in English

《GB/T 20296-2012集成电路记忆法与符号》由TC27（全国电气信息结构、文件编制和图形符号标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Scope

This standard stipulates that the symbols and memory methods used for devices should be consistent with the limited symbols, and it is expected to achieve two purposes, namely: -- for the white box symbols, to give the standard name; -- for the gray box symbols, it is desirable to limit the scope of possible changes, White box symbol: A symbol whose functional behavior of the components in the symbol is fully described by a standardized method. The relevant rules and explanations can be found in Binary Logic Component Symbols and Application Notes, Analog Component Symbols, Application Notes, Gray Box Symbols: Symbols of Components in Symbols Functional behavior, often due to its complexity, some methods used by non-white-box symbols, especially symbols described by referenced supporting documents; relevant rules and explanations can be found in the symbols and application notes, this standard proposes white-box The concept of symbols and gray box symbols is convenient for designers to apply. This standard is applicable to the design of integrated circuits. In Chapter 3, the letter in the second column is W, indicating that the relevant symbols can be used in white box symbols and gray box symbols. The second column is the letter G, which means that the relevant mark can only be used in the gray box symbol, or can only be used in the white box symbol between the boxes (for example, as additional information of "power off"). In the place of m, m shall be replaced by the relevant value, identification number, cycle length, number of digits or sequence number according to the requirements of each case. Where m1×m2 appears, m1 shall be replaced by the number of words, and m2 shall be replaced by the number of digits per word. see symbol,