LVS中的TEXT反标

LVS(Layout Versus Schematics)是物理验证中非常重要的一个步骤。它是用来检查设计的Layout是否和Netlist是否一致。其本质就是对比两个Netlist是否一致。工具将design的layout抽取出其对应的spice netlist，然后和source的netlist进行比对。

现在PR工具会把port作为TEXT自动写到GDS中。但是，有时候会仍会需要我们直接在GDS中反标。比如TOP level的port未必放在PAD上。

那么这里总结一下在GDS中打TEXT的方法。

TEXT坐标文件

示例

语法：

LAYOUT TEXT name x y layer [texttype] [cell_name]

参数：

name：A required name of a layout database text object.

x y：A pair of required floating-point user unit coordinates in the cell space of cell name. Global coordinates are assumed by default.

layer：A required layer number or the name of an original layer or layer set. If layer is a simple layer name, that is equivalent to use of its layer number in the statement. If it is a layer set name, then that is equivalent to the statement being repeated for each element of the layer set.

texttype：An optional non-negative integer that indicates a text object's text type. The value of texttype defaults to 0 when you do not include this parameter in the statement.

cell name：An optional name of a cell in which the text object is to be placed. If not specified, the default is the top-level cell. Asterisks (*) in this parameter are treated as literal characters and not wildcards.

入读TEXT文件

拿到TEXT文件后，在rule deck中，用下面的命令进行读入：

LAYOUT TEXT FILE filename

end

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