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Synthesis Constraints

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158 Threads found on edaboard.com: 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...
Hi, I'm new to FPGA based designs and using XST on Xilinx ISE to synthesize my designs. 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? If it takes all paths in to consideration an
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
Hi I did my PNR using encounter and generated DEF file. Can someone tell me what are the other outputs should I need from my encounter to do my STA using PrimeTime. As far I know .lib(standard cell library) file and .v (Gate level verilog netlist) file are needed for my primetime. But I have .lib from standard cell characterization and gate
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
This is a synthesis script. It does not make any sense running gate simulation with a post synthesis netlist with a SDF. You should not use an SDF in this setup. SDF is only used with a post layout netlist.
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
Hello All, When we converting RTL to Gate Level Netlist, why we need to define clock during synthesis? Regards, Maulin
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
What are the ways to infer whether a path is multicycle or not after synthesis is done.


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