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CBAG (C++ BAG AMS Generator)

A C++ VLSI circuit schematic and layout database library written primarily to work with BAG.

This is a fork of [CBAG] (https://github.com/ucb-art/cbag), which as of May 13th, 2019, has been taken offline temporarily.

Licensing

This library is licensed under the Apache-2.0 license. However, some source files are licensed under both Apache-2.0 and BSD-3-Clause license, meaning that the user must comply with the terms and conditions of both licenses. See here for full text of the BSD license, and here for full text of the Apache license. See individual files to check if they fall under Apache-2.0, or both Apache-2.0 and BSD-3-Clause.

Restrictions

Machine Architecture

  1. This extension will only work on architectures that performs arithmetic right shift. In other words, right shift on negative numbers will fill in 1s on the most significant bit.

Schematic

  1. All schematic pins must be either a scalar net or a bus net, and if it is a bus net, the step size must be exactly 1. For example, foo, bar<3:0>, and baz<0:2> are valid pin names, but a,b, c<3:0:2>, <*3>d are illegal.

  2. If a schematic contains a bus pin, then there can be no other net inside the schematic with the same base name. For example, if a cellview has a pin called foo<3:1>, you cannot have an internal net named foo<4>, or foo<0>.