The ITC'99 benchmarks developed in the CAD Group at Politecnico di Torino (I99T) are a set of circuits whose characteristics are typical of synthesized circuits. For each bench both the RT-level VHDL description and the synthesized Gate-Level netlist are available. In April 2002 new RT-Level VHDL benchmarks were added to the set and more gate-level circuits were synthesized.
I99T benchmarks are available from https://github.com/cad-polito-it/I99T. They are licensed under the European Union Public License v1.2.
Detailed descriptions of benchmarks and an experimental RT-level ATPG tool can be found in the article "RT-Level ITC 99 Benchmarks and First ATPG Results", IEEE Design & Test of Computers, July-August 2000 (DOI: 10.1109/54.867894). Please, cite this paper if you use the benchmarks in your research.
In brief, the main characteristics are:
- Fully synthesizable RT-Level VHDL descriptions (in Synopsys Design Compiler description styles).
- No compiler specific directive.
- Require only IEEE standard logic and arithmetic packages.
- Completely synchronous circuits.
- One single-phase clock signal connected directly to memory elements.
- Global reset signal always available.
- No internal memories (except register banks).
- No 3-state busses.
- No or wired connections.
VHDL RT-Level descriptions range from a tiny, monolithic circuit (1 entity, 1 process, 70 lines) to a large, multi-entity, multi-process one (11 entities, 33 processes, 1,424 lines). At the Gate-Level, netlists range from an s27-sized circuit (2 inputs, 29 gates, 4 flip-flops, 150 faults) to a circuit more than 3 times larger that the largest ISCAS'89 (37 inputs, 69,917 gates, 3,320 flip-flops, 429,712 faults).
VHDL descriptions were synthesized to netlists using both standard options and optimized (_opt) options. The former may contains completely useless gates with no inputs and no outputs. Optimized gate-level circuits superseded the stripped gate-level circuits of the first release. Most benchmarks are available as combinational circuits (_C), where flip-flops have been transformed to input/output pairs. The different releases of the benchmarks are mapped to GitHub's releases.
All benchmarks are syntactically correct, but, due to the development process, there is no guarantee that VHDL descriptions are functionally meaningful. However, to help researchers better understand their results, the original functionalities of VHDL descriptions is reported in the following table.
| NAME | ORIGINAL FUNCTIONALITY |
|---|---|
| b01 | FSM that compares serial flows |
| b02 | FSM that recognizes BCD numbers |
| b03 | Resource arbiter |
| b04 | Compute min and max |
| b05 | Elaborate the contents of a memory |
| b06 | Interrupt handler |
| b07 | Count points on a straight line |
| b08 | Find inclusions in sequences of numbers |
| b09 | Serial to serial converter |
| b10 | Voting system |
| b11 | Scramble string with variable cipher |
| b12 | 1-player game (guess a sequence) |
| b13 | Interface to meteo sensors |
| b14 | Viper processor (subset) |
| b15 | 80386 processor (subset) |
| b16 | Hard to initialize circuit (parametric) |
| b17 | Three copies of b15 |
| b18 | Two copies of b14 and two of b17 |
| b19 | Two copies of b14 and two of b17 |
| b20 | A copy of b14 and a modified version of b14 |
| b21 | Two copies of b14 |
| b22 | A copy of b14 and two modified versions of b14 |
- RT-Level VHDL descriptions (
vhd) - Synthesized netlists in EDIF format (
edf) - Synthesized netlists in ISCAS'89 format (
bench) - Synthesized netlists in BLIF format (
blif) - Fault lists (
fau)
Notes: Due to format restrictions, not all circuits are available in all formats; in some circuits there are multiple connections between the same pair of gates; in some circuits there are dandling (unconnected) gates.