tree 1cd4371ec576d26d28ea054744a1ecbf9ab465cf
parent fd561be276b0a813ec202ada41ffaf3686d81ab9
author Eunchan Kim <eunchan@opentitan.org> 1588045898 -0700
committer Eunchan Kim <eunchan@opentitan.org> 1588100386 -0700
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[topgen] Add External to the top port

This commit is to support last part of inter-module signal, 'exteranl'
type. If any inter-module signal is listed in `inter_module`.`ext` hjson
field, it creates top port with the struct defined in the list.

For instance, if `mod_a` has 'uni' type `sig_a` inter_signal structure
as requester,

```hjson
  'inter_module': {
    'ext': [
        'mod_a.sig_a'
    ]}
```

above hjson configuration creates `output my_pkg::sig_struct_t sig_a_o`
port in the top.

Signed-off-by: Eunchan Kim <eunchan@opentitan.org>