Aloha! (Lets do this on @tech. Hopefully somebody else want to chime in with suggestions and ideas.)
Pavel, I’ve looked at possible FPGA devices to be integrated onto the new Cryptech board to be used as FPGA based master key memory (fpga_mkm). Here are my reasoning for the devices I’ve selected. We want to use a device supported by the Project IceStorm toolchain: [Project IceStorm"](http://www.clifford.at/icestorm/). The toolchain supports a number of devices in the iCE40 LP/HX/LM series: https://www.latticesemi.com/Products/FPGAandCPLD/iCE40 We are currently using the iCEstick evaluation board for the development. The iCEstick is supported by the toolchain. [iCEstick Evaluation Kit - Lattice Semiconductor](http://www.latticesemi.com/en/Products/DevelopmentBoardsAndKits/iCEstick). The dev board sports a iCE40HX1K device. Judging by resource numbers we are currently using 15% of the Programmable Logic Blocks. This means that we could use a smaller device. But the 1K-devices contain an PLL that can be used as clock source (meaning no external clock). I would therefore suggest that we choose one of the 1K-devices. We also need very few I/Os. We currently use nine I/Os, and one is for clock and two are just for debugging (red and green LEDs) Based on this, and looking at availability, I have the following LP1L devices on my list: * [ICE40LP1K-SWG16TR Lattice Semiconductor Corporation | Integrated Circuits (ICs) | DigiKey](https://www.digikey.com/product-detail/en/lattice-semiconductor-corporation/ICE40LP1K-SWG16TR/ICE40LP1K-SWG16TR-ND/4572398). * [ICE40LP1K-CM36 Lattice Semiconductor Corporation | Integrated Circuits (ICs) | DigiKey](https://www.digikey.com/product-detail/en/lattice-semiconductor-corporation/ICE40LP1K-CM36/220-1564-ND/3083574) The 16-ball WLCSP has 0.35 mm spacing and the 36-ball ucBGA has 0.40 mm spacing. From LM1K I would suggest: * [ICE40LM1K-SWG25TR Lattice Semiconductor Corporation | Integrated Circuits (ICs) | DigiKey](https://www.digikey.com/product-detail/en/lattice-semiconductor-corporation/ICE40LM1K-SWG25TR/ICE40LM1K-SWG25TR-ND/4572404) The 25-ball WLCSP has 0.35 mm spacing. All devices seems to be in active production and accessible in single quantities for around 3 USD. Do you think any of these would work? Anyone that you prefer? I haven’t looked at how we are going to program the devices on the board. The devices contain a Flash based config memory that can be programmed and then locked. This is a feature we want to use. -- Med vänlig hälsning, Yours Joachim Strömbergson ======================================================================== Assured AB ========================================================================
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