Search Engine

Synthesis Constraints

Add Question

158 Threads found on Synthesis Constraints
Hi guys, I'm wondering whether or not to constrain the clock skew (uncertainty) for placement and clock tree synthesis. Does this affect the clock path during optimization process when building clock tree, e.g. buffers are added to clock path to satisfy the constrained skew. Or it's just optimization on data path to satisfy setup/hold require
Without floorplan, it is not relevant to fix DRV (trans/cap) during the synthesis step. This must be done during the PnR.
If you are interested for LEC, you just have to provide the constraints. If your device is not stitched and only scan replaced, no need to do LEC as there is not any DFT connection. When you do synthesis using Synopsys DC Compiler, .svf file is generated for particular synthesis, we just need to provide .svf file to the Synopsys formality (...)
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.
FULL CHip FPGA netlist?What is this supposed to mean? FPGA netlists are either EDIF or RTL like any other netlist. If you mean the proprietary (i.e. the secret format) vendor post map, post place and route netlist, then definitely there is no way to do any kind of formal verification. Nobod
STA can be run on 2 occasions : pre-layout & post-layout. Pre-layout STA requires the post synthesis netlist & constraints. Post-layout requires the P&R netlist, the constraints & the SPEF file generated from a tool like STAR RC. If you have a "gate level netlist form synthesis", then you must be doing pre-layout STA. You (...)
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 know without any design d
It the responsibility of the designer to communicate it to the synthesis engineer if there are any multicycle paths in the design. The designer is the only person familiar with the design. The synthesis engineer is unaware of the design details. Once the synthesis engineer is aware of multicycle paths, he can form the necessary (...)
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 ?
The basic questions will be on 1. Clock constraints (master clock, generated clock, clock skew, jitter, clock network delay, source delay) 2. Input and output constraints 3. Virtual clock and the use of it 4. False path and multi cycle path. How will you identify them. 5. How will you fix setup and hold violations 6. What is PVT corner and its effe
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
There are many aspects to cause the size different, both tools are running with different optimization method, this is normal to have size different but not more than 20% different btw both. I only can guess the constraints in both could be different, e.g in synthesis you have use WLM, (top, enclosure, segmented) but i synthesis the RC are (...)
98085 Can some one help me to define SDC constraints on the output of the MUX (at the extreme end.) If i give : clock_generated_clock -source CLK -divide_by 1 then the sequential path is left out but if i give : clock_generated_clock -source CLK -divide_by 2 then the combo path
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? 2) I for
You want to avoid to redo the synthesis? So you could add the constraint in the PnR tool.