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Introduction to Logic Design Using Verilog HDL
Published in Joseph Cavanagh, Verilog HDL Design Examples, 2017
Gate-level modeling using built-in primitives is an intuitive approach to digital design because it corresponds one-to-one with traditional digital logic design at the gate level. Dataflow modeling, however, is at a higher level of abstraction than gate-level modeling. Design automation tools are used to create gate-level logic from dataflow modeling by a process called logic synthesis. Register transfer level (RTL) is a combination of dataflow modeling and behavioral modeling and characterizes the flow of data through logic circuits. The following sections describe different techniques used to design logic circuits using dataflow modeling. These techniques include the continuous assignment statement, reduction operators, the conditional operator, relational operators, logical operators, bitwise operators, and shift operators.
Processor Modeling and Design Tools
Published in Louis Scheffer, Luciano Lavagno, Grant Martin, EDA for IC System Design, Verification, and Testing, 2018
ADL designers consider two important aspects: the level of abstraction vs. generality. It is very difficult to find an abstraction to capture the features of different types of processors. A common way to obtain generality is to lower the abstraction level. Register transfer level (RTL) is a popular abstraction level — low enough for detailed behavior modeling of digital systems, and high enough to hide gate-level implementation details. Early ADLs are based on RTL descriptions. This section briefly describes a structural ADL: MIMOLA [12].
Dataflow Modeling
Published in Joseph Cavanagh, ® HDL Digital Design and Modeling, 2017
Gate-level modeling is an intuitive approach to digital design because it corresponds one-to-one with conventional digital logic design at the gate level. Dataflow modeling, however, is at a higher level of abstraction than gate-level modeling. Design automation tools are used to create gate-level logic from dataflow modeling by a process called logic synthesis. Register transfer level (RTL) is a combination of dataflow modeling and behavioral modeling and characterizes the flow of data through logic circuits.
RDO-WT: optimised Wallace Tree multiplier based FIR filter for signal processing applications
Published in International Journal of Electronics, 2022
L. Malathi, A. Bharathi, A. N. Jayanthi
To show the efficiency of the FIR filter, simulation, implementation and synthesis results are attained for optimised multiplier. Verilog hardware description language is exploited in this work because of its integrated circuit related functions and large number of libraries. Xilinx Integrated Software Environment (ISE) is exploited for synthesis process, and for simulation experiments, Isim tool is used. Implementation is done on Virtex 7 as target chip which is the part of XC7FX330T devices. Version of Xilinx tool is 14.5. The design code is transformed into synthesisable register transfer level (RTL) diagram with gate level net list by using Xilinx Synthesis Tool. Moreover, Matlab platform is utilised to perform a filtering process. Here, publically available dataset is taken to evaluate the noise removal process with the help of proposed FIR filter. The next sub-section explains the dataset description, performance analysis of multiplier and FIR filter as well as effect of the proposed filter design in the noise removal application.
A Low-Power VLSI Implementation of RFIR Filter Design using Radix-2 Algorithm with LCSLA
Published in IETE Journal of Research, 2020
Kasarla Satish Reddy, Hosahally Narayangowda Suresh
From these graphs, it is clear that the performance of the FPGA has been improved in the RFIR filter design based on the Radix2-LCSLA method compared to the existing RFIR filter designs. Figure 12 represents the diagram of RTL schematic of 8B and 3 T for RFIR filter design. This RTL schematic design was taken from the Synplify pro software by using the Verilog code. This architecture has a separate code for each block such as LCSLA, Radix2, counter, reg bank, GRPPG, and an accumulator. Generally, the input value of the multiplication operation with a coefficient provides the output through pipeline shift add tree. Figure 13 shows the RTL schematic of RFIR-Radix2-CSLA filter design for 8B&3 T for180 nm technology, which is taken from the Cadence tool. For ASIC implementation, same the Verilog code has been employed for FPGA implementation. The Cadence RTL compiler is utilized to convert RTL Verilog into gate-level Verilog. The Verilog code is read by employing a Tcl file and corresponding libraries are set in the Tcl file. After the synthesis process the performance parameters of area, power and delay values measured with the help of cadence tool. Finally, the total number of the area, power and delay are mitigated in the RFIR-Radix2-LCSLA method compared to the existing methods.