ArchHDL: A Novel Hardware RTL Design Environment in C++

Abstract

LSIs are designed in four stages including architectural design, logic design, circuit design, and physical design. In the architectural design and the logic design, designers describe a hardware in RTL. However, they generally use different languages. Typically a general purpose programming language such as C or C++ and a hardware description language such as Verilog HDL or VHDL are used in the architectural design and the logic design, respectively. In this paper, we propose a new hardware description environment for the architectural design and logic design which aims to describe and verify a hardware in one language. The environment consists of (1) a new hardware description language called ArchHDL which enables to simulate a hardware faster than Verilog HDL simulation and (2) a source code translation tool from ArchHDL to Verilog HDL. ArchHDL is a new language for hardware RTL modeling based on C++. The key features of this language are that (1) designers describe a combinational circuit as a function and (2) the ArchHDL library implements non-blocking assignment in C++. Using these features, designers are able to write a hardware in a Verilog HDL-like style. The source code of ArchHDL is able to convert to Verilog HDL by the translation tool and is able to synthesize for an FPGA or an ASIC. We implemented a many-core processor in ArchHDL. The simulation speed for the processor by ArchHDL achieves about 4.5 times faster than the simulation speed by Synopsys VCS. We also convert the code to Verilog HDL and estimated the hardware resources on an FPGA. To implement the 48-node many-core processor, it needs 71 % of entire resources of Virtex-7.