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Synthesis Timing Constraints

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74 Threads found on Synthesis Timing Constraints
1. Are there any constraints other than set_input_delay and set_output_delay in your SDC? 2. Is STA successful after synthesis? 3. Are there any reports of timing check violations in the simulator console?
syntax errors will throw an error in the synthesis tool incorrect net names will throw warnings about nets not existing. As for the timing, thats something you need to specify.
FPGA synthesis tools have timing analysis to check if a design is able to run at the intended clock frequency and usually also implement timing driven synthesis to tune the design for maximum speed if required. So the first step would be to write suitable timing constraints and determine the (...)
Suppose I have constraints for five blocks for the synthesis of each of the five blocks. Now this five blocks are instantiated at a top level module and I want to synthesize this top level module. How should we proceed? How can we port the constraints of these five blocks at the top?
I am not sure if the question is valid one at all. the idea of synthesis is not get an area but convert the RTL into gates. The idea is to get a reasonable gate count or rather gate types(like the kind of flops you are using multi-bit or single bit). This is important because of the tools like P&R or timing will upsize/downsize the gates as needed
Hi All, What should I check after logic synthesis? As for me, here is the list: 1) timing Warnings (negative slacks) 2) Gate Count What am I missing? Thank you!
U can use the synthesis constraints itself as the base. Just source this constraints file during the primetime run...
Xilinx reports a maximum freqency for the design when synthesis is done without using ucf or xcf. How reliable is the freqency reported? And does the tool check all timing paths and then report a maximum freqency? That is the timing that you have given the lack of constraints, so yes it has been fully analyzed.
Let's say i have a verilog design the size of a small SoC. It is largely correct, and works nicely in an FPGA on one board. On another identical board, however, it starts giving out intermittent errors, i.e. the I2C gets garbage sent out every 10 bytes. But if i do some irrelevant change, like change HW version register value, to force a re-sy
I think there are different ways to get timing violations in gate level simulation: - the design itself involves design flaws that can't be fixed by the synthesis tool - a basically correct design is synthesized with inappropriate timing constraints - a faulty testbench - wrong gate level library used But how can we (...)
synthesis takes two inputs: constraints and code. The first step is to determine which is the problem. If you have existing constraints then try removing them all (leaving only the chosen part that you want) and just let Quartus synthesize the design. If it routes, then you should start to suspect the constraints that (...)
M not getting the error with ur code, btw, which synthesis tool are you using ?
HI all, Can anyone let me know timing related questions which can be asked during synthesis process ? or any other timing concepts or timing related questions which can be asked during interview. Thanks Limitless_21
If we do not define clock, than what happened? synthesis failed means shows the error/message or it just create the RTL to Gate Level netlist? -> RTL -> Gates conversion doesn't need clock definition. -> you can use any other constraints to define the timing for your design(like max delays etc). -> Clock const
Hello, everyone~ In my digital design, there are two modes for configuring operation clock frequency. CPU:300MHz, Bus:150MHz (2:1 mode) CPU:180MHz, Bus:180MHz (1:1 mode) As you see, the worst case of CPU is 300MHz, and the worst case of Bus is 180MHz. But, I can not give clock period of 300MH
Could you post the constraints in the UCF files as well as the timing errors that you are getting. It would be good if you could also tell us what synthesis and PNR options you are using the ISE Tool.
Hi all, 1) Could you please let me know how can I consider timing-related constraints on place and route. In DC when we are performing synthesis, we can put a kind of constraint on the maximum delay between inputs and ouputs (e.g. delay between in1 and out1 not exceed X ps). I am wondering if there is a similar method in encouter? (...)
What are the ways to infer whether a path is multicycle or not after synthesis is done.
hei b4 that is it possible to do STA on verilog files? You should synthesis it and input the netlist to primetime which can be in *.v format. But not RTL files directly. Correct me if wrong.
Dear all. I am running a synthesis for some componennts of the router I have build in VHDL. My goal is to have latency and throughput resuts for the router. The thing is thath I am trying to understand the difference between the default period analysis (green) and the following red analysis! What is the difference between them? They