Download VHDL Coding and Logic Synthesis with Synopsys by Weng Fook Lee PDF

By Weng Fook Lee

This publication offers the main up to date assurance utilizing the Synopsys software within the layout of built-in circuits. The incorporation of "synthesis instruments" is the most well-liked new approach to designing built-in circuits for greater speeds masking smaller floor parts. Synopsys is the dominant computer-aided circuit layout application on the earth. all the significant circuit brands and ASIC layout businesses use Synopsys . additionally, Synopsys is utilized in instructing and laboratories at over six hundred universities. * First sensible advisor to utilizing synthesis with Synopsys * Synopsys is the number 1 layout application for IC layout

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Extra resources for VHDL Coding and Logic Synthesis with Synopsys

Example text

16 for a diagram of synthesized flip-flop. All possible conditions for the CASE statement are specified. Thus the synthesized circuit is purely logical and no latch is inferred. 34 CHAPTER 3 data_in D clock FIGURE 16 EXAMPLE LIBRARY data_out Q >CLK SYNTHESIZABLE CODE FOR BASIC LOGIC COMPONENTS QN Diagramfor Synthesized Flip-Hop. 19 Example of Flip-Flop S y n t h e s i z a b l e Code IEEE ; U S E IEEE. s t d _ l o g i c _ l 1 6 4 . ALL; fl o p _ e n t IS ENTITY PORT ( data_in clock : IN std_logic; : IN std_logic; data_out : OUT std_logic ); E N D f l o p _ en t; ARCHITECTURE Indication of clock transition from logic '0' to logic '1 '.

Each submodule in the hierarchy (including the TOP level design) is represented by an entity, an architecture, and a configuration declaration. The submodules are instantiated into TOP-level VHDL code. If the submodules consist of even lower level sub-submodules, those sub-submodules are each represented by an entity, architecture, and a configuration. Each of them would then be instantiated into the submodule that glues them together. TOP D A FIGURE 3 B C DiagramShowing a Hierarchical Design. From Fig.

7). A testbench is a "wrap-around" of the design whereby input stimulus are injected into the design while monitoring for expected output waveforms. The simulation result shows an error in the design if the output signals do not match the expected waveforms. When this occurs, the designer must then move back to the HDL coding phase, whereby the code is changed to fix the functional mismatch between the output signals and the expected waveform. This act of simulation and recoding is performed in a loop until the design's output signals match the expected waveform.

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