Hardware design and verilog sample files for Lattice ICE40 development boards and expansion boards.
There are 2 core boards, one based on an ICE40 HX4K with 96 available IO pins, and another based on an ICE40 HX8K with 192 available IO pins.
The core boards are "vanilla" with minimal on board peripherals. Almost all IO pins are routed to mezzanine connectors. Expansion boards can be mixed and matched for different projects, while reusing the core board. The expansion boards can be daisy chained.
This is a work in progress for use in a personal project, but so far the following boards are in the repo:
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vanilla-ice40: core board based on the HX4K TQ144 package. There is an onboard USBC connector for power, programming, and uart/com port communication. It is directly programmable with Lattice Diamond Programmer and icestorm. The onboard FTDI chip can be disabled. The SPI pins to the flash and ice40 are exposed if one wishes to use an external programmer. There are 2 onboard user LEDs, 1 I2C connector, and 96 IOs routed to a mezzanine connector on the right side of the board.
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vanilla-ice40-hx8k: core board based on the HX8K CT256 BGA package. It is similar to the board above, but ads a user button on board. It has 192 available IO pins, with 96 IO pins routed to the left and 96 pins routed to the right of the board. (A PCF file is provided for both boards, sharing the same signal names for the right side of the board.)
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breakout-sram: 16Mbit sram chip with with mezzanine connectors on both side of the board for pass through of unused pins.
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breakout-pmod: 12 port pmod connector, spaced such that they can be used in single, dual or quad pmod configurations.
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breakout-passthrough: direct passthrough of all signals. (This is basically a template and for testing.) NOTE: the net names and labels on this board are stale.
Parts numbers are populated for Digikey and JLCPCB, and JLCPCB rotations are provided. The bom and positions file, along with gerbers, can be exported with the JLCPCB Fabrication Toolkit plugin.
All boards other than the HX8K are single sided and optimized for cost and hand assembly. My soldering skills are below average, and I manged to hand assemble versions of each of these these boards other than the HX8K. The HX8K uses BGA, via-in-pad, and 201 sized caps between the BGA pads, and likely requires higher soldering skills.
- Verilog development has moved to https://github.com/pbozeman/svc for the core SVC library, and https://github.com/pbozeman/svc-example for examples using these boards.