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Update README.md wrt ECP5

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Signed-off-by: David Shah <davey1576@gmail.com>
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David Shah 2018-07-29 14:17:02 +02:00
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README.md
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@ -71,11 +71,16 @@ make -j$(nproc)
sudo make install
```
- For an ECP5 blinky, first synthesise using `yosys blinky.ys` in `ecp5/synth`.
- For an ECP5 blinky, first synthesise using `yosys blinky.ys` in `ecp5/synth`.
- Then run ECP5 place-and route using `./nextpnr-ecp5 --json ecp5/synth/blinky.json --basecfg ecp5/synth/ulx3s_empty.config --bit ecp5/synth/ulx3s.bit`
- Note that `ulx3s_empty.config` contains fixed/unknown bits to be copied to the output bitstream
- You can also use `--textcfg out.config` to write a text file describing the bitstream for debugging
- More examples of the ECP5 flow for a range of boards can be found in the [Project Trellis Examples](https://github.com/SymbiFlow/prjtrellis/tree/master/examples).
- Currently the ECP5 flow supports LUTs, flipflops and IO. IO must be instantiated using `TRELLIS_IO` primitives and constraints specified
using `LOC` and `IO_TYPE` attributes on those instances, as is used in the examples.
### nextpnr-generic
The generic target allows to run place and route for an arbitrary custom architecture.