#include <vpr_types.h>

Collaboration diagram for s_rr_node:

Data Fields
short	xlow
short	xhigh
short	ylow
short	yhigh
short	ptc_num
short	cost_index
short	occ
short	capacity
short	fan_in
short	num_edges
t_rr_type	type
int *	edges
short *	switches
float	R
float	C
enum e_direction	direction
enum e_drivers	drivers
int	num_wire_drivers
int	num_opin_drivers
int	prev_node
int	prev_edge
int	net_num
t_pb_graph_pin *	pb_graph_pin
t_tnode *	tnode
float	pack_intrinsic_cost

Detailed Description

Main structure describing one routing resource node. Everything in this structure should describe the graph -- information needed only to store algorithm-specific data should be stored in one of the parallel rr_node_?? structures.

xlow, xhigh, ylow, yhigh: Integer coordinates (see route.c for coordinate system) of the ends of this routing resource. xlow = xhigh and ylow = yhigh for pins or for segments of length 1. These values are used to decide whether or not this node should be added to the expansion heap, based on things like whether it's outside the net bounding box or is moving further away from the target, etc.
type: What is this routing resource?
ptc_num: Pin, track or class number, depending on rr_node type. Needed to properly draw.
cost_index: An integer index into the table of routing resource indexed data (this indirection allows quick dynamic changes of rr base costs, and some memory storage savings for fields that have only a few distinct values).
occ: Current occupancy (usage) of this node.
capacity: Capacity of this node (number of routes that can use it).
num_edges: Number of edges exiting this node. That is, the number of nodes to which it connects.
edges[0..num_edges-1]: Array of indices of the neighbours of this node.
switches[0..num_edges-1]: Array of switch indexes for each of the edges leaving this node.

The following parameters are only needed for timing analysis.

R: Resistance to go through this node. This is only metal resistance (end to end, so conservative) -- it doesn't include the switch that leads to another rr_node.
C: Total capacitance of this node. Includes metal capacitance, the input capacitance of all switches hanging off the node, the output capacitance of all switches to the node, and the connection box buffer capacitances hanging off it.
direction: if the node represents a track, this field indicates the direction of the track. Otherwise the value contained in the field should be ignored. (UDSD by AY)
drivers: if the node represents a track, this field indicates the driving architecture of the track. Otherwise the value contained in the field should be ignored. (UDSD by AY)

Definition at line 795 of file vpr_types.h.