Struct libreda_pnr::util::tie_cell_insertion::SimpleTieCellInsertionEngine

pub struct SimpleTieCellInsertionEngine {
    pub tie_cell_low: String,
    pub tie_cell_high: String,
    pub max_fanout: u32,
    pub max_distance: Coord,
}

Insert tie cells and connect unconnected LOW and HIGH nets.

Tie-cells are placed such that the maximal manhattan distance to the sinks is kept below max_distance.

Fields

tie_cell_low: String

Name of the tie-low cell to be used for buffering constant LOW nets.

tie_cell_high: String

Name of the tie-high cell to be used for buffering constant HIGH nets.

max_fanout: u32

Maximal number of cells that should be driven by a tie-cell cell. Must be larger than 1.

max_distance: Coord

Maximal manhattan distance from the tie-cell to the attached sink.

Implementations

impl SimpleTieCellInsertionEngine

pub fn insert_tie_cells_on_net<LN: NetlistEdit + LayoutEdit>( &self, chip: &mut LN, net: &LN::NetId ) -> Result<(Vec<LN::CellInstId>, Vec<LN::NetId>), ()>where LN::Coord: PrimInt,

Insert tie cells to drive the sinks which are attached to this net. The net must be either the constant LOW or HIGH net.

A tie cell is usually used to drive a cluster of many inputs. The way the clusters are formed depends on the locations of the inputs such that the wiring can be minimized from tie-cells to inputs but also the additional space required by tie-cells is reasonable (instead of placing a tie-cell for every input).

fn insert_tie_cells<LN: NetlistEdit + LayoutEdit>( &self, chip: &mut LN, signal_sinks: &Vec<TerminalId<LN>> ) -> Result<(Vec<LN::CellInstId>, Vec<LN::NetId>), ()>where LN::Coord: PrimInt,

All terminals must be in the same parent cell. Returns a vector of all added tie-cell instances and all added nets.

Trait Implementations

impl Clone for SimpleTieCellInsertionEngine

fn clone(&self) -> SimpleTieCellInsertionEngine

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SimpleTieCellInsertionEngine

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.