Tìm thấy 16+ kết quả cho từ khóa "Logic synthesis"
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Not all constructs can be used when writing a description for a logic synthesis tool. acceptable to the logic synthesis tool. A list of constructs that are typically accepted by logic synthesis tools is given in Table 14-1. The capabilities of individual logic synthesis tools may vary. The constructs that are typically acceptable to logic synthesis tools are also shown.. Verilog HDL Constructs for Logic Synthesis Construct.
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Thus, the designer's mind was used as the logic synthesis tool, as illustrated in Figure 14-1.. Designer's Mind as the Logic Synthesis Tool. The advent of computer-aided logic synthesis tools has automated the process of converting the high-level description to logic gates.
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The design is represented internally by the logic synthesis tool in terms of internal data structures. The logic is now optimized to remove redundant logic. It is a very important step in logic synthesis, and it yields an optimized internal representation of the design.. Until this step, the design description is independent of a specific target technology.
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If any timing constraints are violated, the designer must either redesign part of the RTL or make trade-offs in design constraints for logic synthesis. 14.6 Modeling Tips for Logic Synthesis. The Verilog RTL design style used by the designer affects the final gate-level netlist produced by logic synthesis. Logic synthesis can produce efficient or inefficient gate- level netlists, based on the style of RTL descriptions.
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However, high-level synthesis is still an emerging design paradigm, and RTL remains the popular high-level description method for logic synthesis tools.
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Additional user controls are available to allow the user to adjust the “aggressiveness” with which Cynthesizer fills each clock period with logic.. These controls can be used to make downstream timing closure even easier, thereby reducing processing time in downstream tools such as logic synthesis.. This ensures that the timing assumptions made during high-level synthesis are maintained during logic synthesis..
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Most of the HLS tools let the logic synthesis adapt their RTL outputs to the frequency.
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For instance, an encryption RTL-IP at 200 Mbps is difficult to be “upgraded” to perform encryp- tions at 800 Mbps, because the RTL-IP structure is fixed and the logic synthesis tool is not able to reduce its delay by a forth. The two required different Bit Error Rate, which is defined by several parameters such as encode rate and constraint bit length. Changing these parameters requires signifi- cant modification of the RTL-IP.
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Figure 9.9 shows respectively for each approach the synthesis results we obtained by using a Xilinx Virtex2 xc2v8000 -4 FPGA device and the ISE 8.2 logic synthesis tool. Considering different widths for each input can thus reduce the operator area.
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In general, any construct that is used to define a cycle-by-cycle RTL description is acceptable to the logic synthesis tool. accepted by logic synthesis tools is given in Table 14-1. The capabilities of individual logic synthesis tools may vary. The constructs that are typically acceptable to logic synthesis tools are also shown.. Verilog HDL Constructs for Logic Synthesis Construct. Hence, there are restrictions on the way these constructs are used for the logic synthesis tool.
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Having understood how basic Verilog constructs are interpreted by the logic synthesis tool, let us now discuss the synthesis design flow from an RTL description to an optimized gate-level description.. 14.4.1 RTL to Gates. To fully utilize the benefits of logic synthesis, the designer must first understand the flow from the high-level RTL description to a gate-level netlist. Logic Synthesis Flow from RTL to Gates. RTL description.
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Thus, the designer's mind was used as the logic synthesis tool, as illustrated in Figure 14-1.. Designer's Mind as the Logic Synthesis Tool. The advent of computer-aided logic synthesis tools has automated the process of converting the high-level description to logic gates.
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If any timing constraints are violated, the designer must either redesign part of the RTL or make trade-offs in design constraints for logic synthesis. 14.6 Modeling Tips for Logic Synthesis. The Verilog RTL design style used by the designer affects the final gate-level netlist produced by logic synthesis. Logic synthesis can produce efficient or inefficient gate-level netlists, based on the style of RTL descriptions.
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The advent of logic synthesis in the late 1980s changed the design methodology radically. Thus, the designer had to specify how the data flows between registers and how the design processes the data. implement the circuit were automatically extracted by logic synthesis tools from the RTL description.. Thus, logic synthesis pushed the HDLs into the forefront of digital design.
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Smaller blocks reduce the complexity of optimization for the logic synthesis tool.. Accurate specification of design constraints is an important part of logic synthesis.. However, high-level synthesis is still an emerging design paradigm, and RTL remains the popular high-level description method for logic synthesis tools
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Most popular logic synthesis tools support Verilog HDL. All fabrication vendors provide Verilog HDL libraries for postlogic synthesis simulation. Thus, designing a chip in Verilog HDL allows the widest choice of vendors.. Designers can customize a Verilog HDL simulator to their needs with the PLI.. Verilog HDL is also being constantly enhanced to meet the needs of new verification methodologies..
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Logic synthesis tools can automatically convert the design to any fabrication technology. They simply input the RTL description to the logic synthesis tool and create a new gate-level netlist, using the new. The logic synthesis tool will optimize the circuit in area and timing for the new technology.. By describing designs in HDLs, functional verification of the design can be. done early in the design cycle.
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To handle the necessary inter-island communications, we use the data-routing logic to route data from the external islands.. The configurations of the LRF, FUP and the data-routing logic are application-specific. This will simplify the data-routing logic in each island and reduce the overall complexity of the resulting datapath.. The technical details of the DRFM-based resource binding algorithm are avail- able in [6].
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Atomicity requires control logic, and that control logic is non-modular.. This leads precisely to the core reason why Bluespec SystemVerilog [3] dramat- ically raises the level of abstraction – automatic synthesis of all the complex control logic that is needed for atomicity.. Provision of compositional atomic transactions within the context of a familiar hardware design language (SystemVerilog [9]). Definition of precise mappings of atomic transactions into clocked synchronous hardware.
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Behavioral synthesis is a logic way to go as it allows “less detailed design description” and “higher reusability”.. It is sometimes claimed that behavioral synthesis is only useful for dataflow intensive circuits, but not for control dominated circuits. We believe that behavioral synthesis can and should be used for all hardware modules in order to truly benefit from it.