Aloha! Replying to myself here. Reading up on device programming I found an issue:
[iCE40 Programming and Configuration](http://www.latticesemi.com/view_document?document_id=46502) It turns out that the LM versions of iCE40 lacks the in-package non-volatile configuration memory (NVCM). We want to have this memory. This removes the LM-device below from the list of candidates. The LP-versions includes the NVCM. Regards, JoachimS On 2020-03-24 16:34, Joachim Strömbergson wrote: > 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. > > > _______________________________________________ > Tech mailing list > Tech@cryptech.is > https://lists.cryptech.is/listinfo/tech > -- Med vänlig hälsning, Yours Joachim Strömbergson ======================================================================== Assured AB ========================================================================
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