72 lines
2.1 KiB
ReStructuredText
72 lines
2.1 KiB
ReStructuredText
LiteX demo
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~~~~~~~~~~
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This example design features a LiteX+<CPU variant>-based SoC. It also includes DDR
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controller. First, enter this example's directory:
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.. code-block:: bash
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:name: example-litex-dir
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cd litex_demo
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Install the litex dependencies with the following:
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.. code-block:: bash
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:name: example-litex-req
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pip install -r requirements.txt
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There are multiple CPU types supported, choose one from the below commands to generate the design and build it.
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**Picorv32**
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.. code-block:: bash
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:name: example-litex_picorv32-a35t-group
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./src/litex/litex/boards/targets/arty.py --toolchain=symbiflow --cpu-type=picorv32 --sys-clk-freq 80e6 --output-dir build/picorv32/arty_35 --variant a7-35 --build
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.. code-block:: bash
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:name: example-litex_picorv32-a100t-group
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./src/litex/litex/boards/targets/arty.py --toolchain=symbiflow --cpu-type=picorv32 --sys-clk-freq 80e6 --output-dir build/picorv32/arty_100 --variant a7-100 --build
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**VexRiscv**
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.. code-block:: bash
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:name: example-litex_vexriscv-a35t-group
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./src/litex/litex/boards/targets/arty.py --toolchain=symbiflow --cpu-type=vexriscv --sys-clk-freq 80e6 --output-dir build/vexriscv/arty_35 --variant a7-35 --build
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.. code-block:: bash
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:name: example-litex_vexriscv-a100t-group
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./src/litex/litex/boards/targets/arty.py --toolchain=symbiflow --cpu-type=vexriscv --sys-clk-freq 80e6 --output-dir build/vexriscv/arty_100 --variant a7-100 --build
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Depending on which board and CPU-type you selected, the bitstream is loacted in:
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.. code-block:: bash
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cd build/<cpu-type>/<board>/gateware
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Now you can upload the design with:
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.. code-block:: bash
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openFPGALoader -b arty_a7_100t top.bit
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.. note::
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This example uses baud rate of ``115200`` by default.
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You should observe the following line in the OpenOCD output
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.. code-block:: bash
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Info : JTAG tap: xc7.tap tap/device found: 0x0362d093 (mfg: 0x049 (Xilinx), part: 0x362d, ver: 0x0)
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In the ``picocom`` terminal, you should observe the following output:
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.. image:: ../../docs/images/litex-picorv32-console.gif
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:align: center
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:width: 80%
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