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Altera_Forum
Honored Contributor I
711 Views

RTL and gate-level synthesis

Hi everybody! 

Now I'm trying to examine the FPGA project design flow. And I'm confused because of some concepts. Do RTL- and gate-lavel synthesis mean the same? If they differ could you explain their differences? 

 

thank you in advance!
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2 Replies
Altera_Forum
Honored Contributor I
51 Views

Refer to the chapter quartus ii integrated synthesis in Quartus software manual.

VerLearn
Beginner
30 Views

In a nutshell, RTL (Register Transfer Level) (Pre-Synthesis simulation) is the digital circuit that consists of combinational logic, memory elements, and clocks. The simulation takes place without any delays. Eg: Consider a half adder. module HalfAdder( output sum, output carry, input input1, input input2); assign sum=input1^input2; assign carry=input1&input2; endmodule The RTL schematic contains an XOR gate and an AND gate. This RTL schematic is generated by simulation tool. GATE level simulation (Post synthesis simulation): The synthesized RTL schematic is run with the provided timing delays. Gates are taken from the cell library. Note: Sometimes, GATE level simulation results and RTL simulation results may not match. The answer is simple. If you use constructs that are not available to the synthesis tool, results vary.