Rsyn – An Extensible Physical Synthesis Framework
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Latest commit 3fd9cbe Jan 17, 2018 @gaflach gaflach Porting Rsyn from wxWidgets to Qt and much more.
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Universidade Federal do Rio Grande do Sul


Getting Started | Tutorials | Wiki | Benchmarks

Rsyn is an open-source C++ framework for physical synthesis research and education.

Typical optimizations that can be built on top of Rsyn include but not limited to placement, routing, sizing and buffering.

The framework integrates parsers for common academic and industrial formats as Bookshelf, LEF/DEF, Verilog, Liberty, SDC and SPEF. It provides support for benchmarks from several EDA contests (e.g ISPD, ICCAD).

Standard tools as static timing analysis (STA), routing and congestion estimation are included. A built-in graphics user interface (GUI) is also available.


The netlist data model makes use of the new features of C++11. So it becomes very natural and easy to traverse the netlist.

// Traverse pins in reverse topological order.
for (Rsyn::Pin pin : module.allPinsInReverseTopologicalOrder()) {
	for (Rsyn::Arc arc : pin.allOutgoingArcs()) { /**/ }
	for (Rsyn::Arc arc : pin.allIncomingArcs()) { /**/ }

	Rsyn::Net net = pin.getNet();
	if (!net) {
		std::cout << “Unconnected pin ‘” + pin.getFullName() + “‘\n”;
	} // end if
} // end for 

Objects can be extended via attributes, which internally handle modifications in the netlist.

// Creating a new attribute called “visited” to the nets
Rsyn::Attribute<Rsyn::Net, int> attr = design.createAttribute();

for (Rsyn::Net net : module.allNets()) {
	attr[net] = computeSomething(net); 
} // end for

Rsyn::Net newNet = module.createNet();
attr[newNet] = computeSomething(net);

Supported Compilers and Operating Systems:

Compiler Operating System
GCC 5.4.0 Ubuntu 16.04.3 LTS
GCC 7.2.0 Ubuntu 17.10


More details about Rsyn are available at wiki.


Please cite the ISPD 17 paper:

G. Flach, M. Fogaça, J. Monteiro, M. Johann and R. Reis, "Rsyn: An Extensible Physical Synthesis Framework", Proceedings of the 2017 ACM on International Symposium on Physical Design (ISPD), pp. 33-40, Portland, Oregon, USA 2017.





Former Contributors

Tiago Reimann, Julia Puget, André Oliveira, Carolina Lima, Felipe Pinto, and Lucas Cavalheiro

Honorable Mention

Renato Hentschke, and Gustavo Wilke

Third-Party Projects




Copyright 2014-2017 Rsyn

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


This work is partially supported by Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES) and by the National Council for Scientific and Technological Development (CNPq).