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arch_api: Outline of new cluster API

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Signed-off-by: gatecat <gatecat@ds0.me>
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gatecat
2021-04-27 10:42:01 +01:00
parent ed17091e6a
commit b62dcc4bcc
4 changed files with 43 additions and 14 deletions
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docs/netlist.md
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@@ -23,11 +23,7 @@ Other structures used by these basic structures include:
- `ports` is a map from port name `IdString` to `PortInfo` structures for each cell port
- `bel` and `belStrength` contain the ID of the Bel the cell is placed onto; and placement strength of the cell; if placed. Placement/ripup should always be done by `Arch::bindBel` and `Arch::unbindBel` rather than by manipulating these fields.
- `params` and `attrs` store parameters and attributes - from the input JSON or assigned in flows to add metadata - by mapping from parameter name `IdString` to `Property`.
- The `constr_` fields are for relative constraints:
- `constr_parent` is a reference to the cell this cell is constrained with respect to; or `nullptr` if not relatively constrained. If not `nullptr`, this cell should be in the parent's `constr_children`.
- `constr_children` is a list of cells relatively constrained to this one. All children should have `constr_parent == this`.
- `constr_x` and `constr_y` are absolute (`constr_parent == nullptr`) or relative (`constr_parent != nullptr`) tile coordinate constraints. If set to `UNCONSTR` then the cell is not constrained in this axis (defaults to `UNCONSTR`)
- `constr_z` is an absolute (`constr_abs_z`) or relative (`!constr_abs_z`) 'Z-axis' (index inside tile, e.g. logic cell) constraint
- `cluster` is used to specify that the cell is inside a placement cluster, with the details of the placement within the cluster provided by the architecture.
- `region` is a reference to a `Region` if the cell is constrained to a placement region (e.g. for partial reconfiguration or out-of-context flows) or `nullptr` otherwise.
## NetInfo