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55 Threads found on Design Lut
137319 Hi, It is a ISRO question in 2015. Can somebody give a clear understanding of FPGA resources and where actually the board keeps the combo logic and sequential logic after programmed.
There are no asynchronous RAMs in an FPGA is that clear enough? If you try to implement one it will either a) fail to implement, or b) end up as a huge design that implements latches in the lut fabric to store bits.
Incoming sine wave seems to refer to an "all-digital PLL" with sinusoidal reference input. You find it e.g. in grid tied inverters or other power electronic systems with active front end. This designs typically use a sine lut and digital sine signals.
Rule violation (lutLP-1) Combinatorial Loop - 1 lut cells form a combinatorial loop. This can create a race condition. Timing analysis may not be accurate. The preferred resolution is to modify the design to remove combinatorial logic loops. To allow bitstream creation for designs with combinatorial logic (...)
Hi, I once was asked a question on how to design a look up table. It is said that the full table will need 16-bit address for some random data. In order to save resource, it was required to use 4-bit entry address. I had logic design for some time, but this question was beyond of my solution even after a long time. Could you explain it (...)
Do you want the difference between lut and mux? or lut and ROM? In terms of FPGA, a lut refers to the small programmable devices (really just ROMS) that create the logic in the design. A ROM would be a memory device made using integrated RAMs or many luts.
Hello, guys, may i ask 1 naive questions: 1. how do you know the size of a asci or fpga design? when you say size, do you all mean the cell number or something else? Thanks,
Hi Friends Currently am pursuing my final year ME VLSI design. I do a project in SELF CHECKING CIRCUITS FOR LOOK UP TABLE. I use a technique called SCALABLE ERROR DETECTION method for this self checking process. Now i am in a stage to implement the circuit in TANNER EDA TOOL. Could anyone help me out .... Have a Happy Day...
Hello, I have a design where behavioral simulation is different from post synthesis simulation. I tried to correct all the codes that might cause this difference, yet the same. The thing that REALLY annoys me is I am unable to debug each stage of my code in post synthesis simulation. Is there a way that I can check my post synthesis simulation
Virtex-7 is manufactured with 28 nm technology. Most of question you asked can be found on Virtex-7 datasheet: Some maximum frequencies for -3 speed grade: DDR3@1866 Mb/s IO: 533 MHz CLB: 1818 MHz BRAM: 601 MHz DSP48E1: 741 MHz (all pipelines) But keep in m
Aim: :!: I want to design a Voltage controlled current source based on Look up table in ADS 2012. I searched and I could not find anything useful. Problem: I used DC simulation on a diode to get I-V curve. Now I want to make a current source generator based on the simulated values. :?: What should i do?
But it shows the area of your design. It can be useful when you want to compare two architecture together.
these are similar, but may have context. In an FPGA, luts are the basic elements and 16:1, 32:2, 64:1, etc... sized programmable luts are common. This actually makes a practical difference when designers try to optimize for minimum gate count without realizing that the design will be mapped onto lut. (...)
Find the books at for VHDL imprementation or workshop on Chip design. Own, I think the matrix form instead memory if you are mathematician or can be use the input vector files.
VHDL doesn't generate a device summary...the synthesis tool does. The simple answer is all of the above. A more complicated answer is whatever is important to you and the design you're implementing. e.g. design must run at 500 MHz in the FPGA. Then you better have 1-flip-flop 1 lut pair with no extra luts feeding the (...)
i have no idea about this lut..need 2 design a 3 bit multiplier using this method..any help
hi sir, how to write program in verilog for lut optimization for memory based computation Or, do you want to optimize a spice netlist of a given lut for delay and area by optimizing the transistor widths in a full-custom digital design style? This works well, but you need a circuit optimization software.
Hello Dears Could you please explain, what is the deference between BRAM and lut in fpga? In fact when and where you, as a designer, apply BRAM or lut in your design? Regards Mostafa
Hi all, I've used Virtex-4 SX35 before. When I used 80%of lut and 75% of register, it became unroute-able. I've used three BUFGs and a few BUFIOs. In case of V4-Fx100, the maximum I could reach was less than those numbers, and I used more BUFGs. I know it really depends on design, but I wonder what the realistic maximum utilization we can
this is all down to your design. If you are running out of resources, you may need to look at resource sharing, but this will increase your latency, which may lead to problems elsewhere. You may also need to reduce the range or accuracy of your data values to reduce the logic usage. But this will depend on the accuracy and latencies required. If y