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| author | David Shah <dave@ds0.me> | 2020-11-30 08:59:04 +0000 |
|---|---|---|
| committer | David Shah <dave@ds0.me> | 2020-11-30 08:59:04 +0000 |
| commit | 2fe8bebc6ce464afadef2403a8331031e16c5a5d (patch) | |
| tree | afd13c654df1faa0b5df9f11be74eede087fa564 /docs | |
| parent | 567166aeceefc513c498c542873c1533bd73dfbe (diff) | |
| download | nextpnr-2fe8bebc6ce464afadef2403a8331031e16c5a5d.tar.gz nextpnr-2fe8bebc6ce464afadef2403a8331031e16c5a5d.tar.bz2 nextpnr-2fe8bebc6ce464afadef2403a8331031e16c5a5d.zip | |
nexus: Update docs and CMake
Signed-off-by: David Shah <dave@ds0.me>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/nexus.md | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/docs/nexus.md b/docs/nexus.md new file mode 100644 index 00000000..99ac926f --- /dev/null +++ b/docs/nexus.md @@ -0,0 +1,20 @@ +# nextpnr-nexus notes + +### Constraints + +Currently the following PDC constraint styles are supported for IO constraints: + +``` +ldc_set_location -site {G13} [get_ports gsrn] +ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[0]}] +``` + +Timing constraints are currently ignored, but should be expected to be supported soon. + +### Command Line + +A full device name is specified on the command line. It should be postfixed with 'ES' if using an engineering sample device to ensure correct use of the ES IDCODE. + +``` +--device LIFCL-40-9BG400CES +``` |