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| A High-Performance Open Source Oscilloscope: development log & future ideas |
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| asmi:
--- Quote from: tom66 on November 19, 2020, 12:34:38 pm ---I'll give the Cyclone 10 devices a look. --- End quote --- Don't bother. It's garbage. |
| tom66:
Sigh. At least I can build for Zynq using Vivado WebPACK. |
| nctnico:
--- Quote from: asmi on November 19, 2020, 02:32:56 pm --- --- Quote from: tom66 on November 19, 2020, 12:34:38 pm ---I'll give the Cyclone 10 devices a look. --- End quote --- Don't bother. It's garbage. --- End quote --- I'll take you word for it but still I wonder if you can elaborate a bit more about why these devices are a bad choice. |
| asmi:
--- Quote from: nctnico on November 19, 2020, 02:38:22 pm ---I'll take you word for it but still I wonder if you can elaborate a bit more about why these devices are a bad choice. --- End quote --- LP subfamily, which can be used with free version of their tools, doesn't even have memory controllers :palm: GX subfamily is behind a heavy paywall (4k$ a year). You are better off using Kintex-7 devices from Xilinx, lower end ones (70T and 160T) can be used with free tools, license for 325T can be purchased with a devboard and subsequently used for your own designs (Xilinx device-locked license allows using that part in any package and speed grade, not necessarily the one that's on a devboad, and it's a permanent license, not subscription), the cheapest Kintex-7 devboard that I know of that ships with a license is Digilent's Genesys 2 board for $1k, and you can find 325T devices in China for 200-300$ a pop, as opposed to Digikey prices of 1-1.5k$ a pop. Or you can talk to Xilinx directly, and they typically provide deep discounts - it won't be as cheap as you can get them in China, but it will be a fully legit devices and you can be sure you can always buy them at that price, while sources in China tend to be ad-hoc - they appear on a market, they sell their stock, and they disappear forever. These devices provide up to 64/72bit 933MHz DDR3 interface (~14.6 GBytes/s of bandwidth), up to 16 transceivers which can go as high as 12.5 Gbps (depending on package and speed grade), and all of that in convenient 1 mm pitch BGA packages with 400 or 500 user IO balls so you can connect a lot of stuff to it. But most importantly, Kintex-7 fabric is significantly faster than even Artix-7/Spartan-7 one, which is faster than anything Intel offers in Cyclone family. |
| nctnico:
--- Quote from: asmi on November 19, 2020, 02:54:39 pm --- --- Quote from: nctnico on November 19, 2020, 02:38:22 pm ---I'll take you word for it but still I wonder if you can elaborate a bit more about why these devices are a bad choice. --- End quote --- LP subfamily, which can be used with free version of their tools, doesn't even have memory controllers :palm: GX subfamily is behind a heavy paywall (4k$ a year). You are better off using Kintex-7 devices from Xilinx, lower end ones (70T and 160T) can be used with free tools, license for 325T can be purchased with a devboard and subsequently used for your own designs (Xilinx device-locked license allows using that part in any package and speed grade, non necessarily the one that's on a devboad, and it's a permanent license, not subscription), the cheapest Kintex-7 devboard that I know of that ships with a license is Digilent's Genesys 2 board for $1k, and you can find 325T devices in China for 200-300$ a pop, as opposed to Digikey prices of 1-1.5k$ a pop. Or you can talk to Xilinx directly, and they typically provide deep discounts - it won't be as cheap as you can get them in China, but it will be a fully legit devices and you can be sure you can always buy them at that price, while sources in China tend to be ad-hoc - they appear on a market, they sell their stock, and they disappear forever. These devices provide up to 64/72bit 933MHz DDR3 interface (~14.6 GBytes/s of bandwidth), up to 16 transceivers which can go as high as 12.5 Gbps (depending on package and speed grade), and all of that in convenient 1 mm pitch BGA packages with 400 or 500 user IO balls so you can connect a lot of stuff to it. --- End quote --- For a moment assume the $4k for the Cyclone 10 license drops to 0. Are there any technical problems with the Cyclone 10 FPGAs? The Kintex device you are proposing is about 3 times more expensive (up to 10 times when comparing Digikey prices). Even with the $4k subscription it doesn't take selling a lot of boards to break even. |
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