Definition

class spydrnet_physical.ir.definition.Definition(name=None, properties=None)

Bases: Definition

Extending the definitions representation

Methods:

__init__	Creates an empty object of type definition
remove_cable	Remove a cable from the definition.
remove_port	Remove port from the definition.
create_ft_ports	Alias to create_feedthroughs_ports
create_feedthroughs_ports	Given the cable object it creates a feedthrough ports on this definition
create_feedthrough	Creates a feedthrough for a single cable passing through list of instances
create_parallel_feedthrough
create_ft_multiple	Alias to create_feedthrough_multiple
create_feedthrough_multiple	This creates feedthough from list of instances on multiple locations Expects the list of tuples in following format
merge_multiple_instance	This method can merge multiple group of instances having same order of reference definition.
merge_instance	Merges the list of instances to unique definition
OptPins	This method optimizes the definitions pins bu inspecting all the instances of the definition
OptWires	List the wires which can be optimised based on different constraints
duplicate_port	Duplicates existing port in the definition Uses assign block beetween to short two cables If post in output port assign new_port = initial_port else assign initial_port = new_port
combine_cables	Combines multiple cables to new cable.
combine_ports	This method can combine multiple input or output ports togther to create a bus structure.
split_port_fanout	Split the given port into multiple ports This is used to split the fanout ports
create_unconn_wires
merge_ports
split_port	Split the given port
flatten_instance	Flatterns single instance in the given definition
get_connectivity_network	This method converts current module into networkx graph each cell is represented as as node and nets are represented as edges
make_instance_unique	clone the definition and point the reference to the new definition
add_buffer	Adds buffer on the given net :Parameters: * wire (sdn.Wire, sdn.Cable) -- Cable or a wire to be buffered * buffer (str) * instance_name (sdn.Instance) * ports tuple (str, str)
add_cable	Add a cable to the definition.
add_child	Add an existing instance to the definition.
add_port	Add a preexisting port to the definition.
clean_single_bit_assign
clone	Clone the definition in an api safe way.
create_cable	Create a cable, add it to the definition, and return the cable.
create_child	Create an instance to add to the definition, add it, and return the instance.
create_port	Create a port, add it to the definition, and return that port.
get	get the item from the data structure
get_cables	get_cables(...)
get_definitions	get_definitions(...)
get_hcables	get_hcables(...)
get_hinstances	get_hinstances(...)
get_hpins	get_hpins(...)
get_hports	get_hports(...)
get_hwires	get_hwires(...)
get_instances	get_instances(...)
get_libraries	get_libraries(...)
get_netlists	get_netlists(...)
get_pins	get_pins(...)
get_ports	get_ports(...)
get_wires	get_wires(...)
is_leaf	Check to see if this definition represents a leaf cell.
pop	pop the object from the data structure
remove_cables_from	Remove a set of cables from the definition.
remove_child	Remove an instance from the definition.
remove_children_from	Remove a set of instances from the definition.
remove_ports_from	Remove a set of ports from the definition.
somhing

Attributes:

utilization	Return utilization of this module
area
cables	Get the cables that are instanced in this definition.
children	Return a list of all instances instantiated in this definition
data	Data stores information about the element
get_index	Returns python index of element
get_verilog_index	Returns verilog index of element
library	Get the library that contains this definition
name	The name of this element
ports	Get the ports that are instanced in this definition
properties	Returns properties of the object
references	Get a list of all the instances of this definition

__init__(name=None, properties=None)

Creates an empty object of type definition

Parameters:

• name - (str) the name of this instance

• properties - (dict) the dictionary which holds the properties

property utilization

Return utilization of this module

remove_cable(cable)

Remove a cable from the definition.

The cable must be a member of the definition.

Parameters:

cable - (Cable) the cable to be removed from the definition

remove_port(port)

Remove port from the definition. (Overrides the base method)

Parameters:

port ((Port) the port to be removed, must be of this definition)

create_ft_ports(*args, **kwargs)

Alias to create_feedthroughs_ports

create_feedthroughs_ports(cable, suffix='ft', get_port_names=<function Definition.<lambda>>)

Given the cable object it creates a feedthrough ports on this definition

• The new ports names as {cable_name}_{suffix}_in and {cable_name}_{suffix}_out - Direct assignment is created beetween newly added two ports

Parameters:

• cable (Port) – The cable for which feedthrough needs to be created

• suffix (str) – Sufffix used for the port naming

• get_port_names (callable) – function to return custom names get_port_names(sdn.IN or sdn.out)

Returns:

Feedthrough port (inport and outport)

Return type:

tuple

create_feedthrough(instances_list, cable, get_port_names=<function Definition.<lambda>>, get_cable_names=<function Definition.<lambda>>)

Creates a feedthrough for a single cable passing through list of instances

The driver cable name is unchanged and newly created feedthrough cable name {cable_name}_ft_{indx}

Parameters:

• instances_list (list[instance]) – List of instances to create feedthrough from

• cable (Cable) – cable fro which feedthrough needs to be creared

• get_port_names (callable) – –

• get_cable_names (callable) – –

Returns:

List of newly created cables in order

Return type:

list(Cable)

create_ft_multiple(*args, **kwargs)

Alias to create_feedthrough_multiple

create_feedthrough_multiple(instances_list)

This creates feedthough from list of instances on multiple locations Expects the list of tuples in following format

Parameters:

instances_list ((Cable, (inst1, inst1, … .instn))

merge_multiple_instance(instances_list_tuple, new_definition_name=None, pin_map=None)

This method can merge multiple group of instances having same order of reference definition.

First pair of the instances_list_tuple is used to create new definition and that is reused while grouping remaining group of instances

Parameters:

• instances_list_tuple = [ (inst_1, inst_2, …., inst_n)

• new_definition_name (str)

• pin_map (Callable)

merge_instance(instances_list, new_definition_name='', new_instance_name='', pin_map=None)

Merges the list of instances to unique definition

Parameters:

• instances_list (List(Instance)) – List of instances to be merged

• new_definition_name – Name of the new definition created

• new_instance_name – Name of the new instance created

• pin_map (Callable, Dict) – External function to map new pin name based in definition and instance name get_pin_name(<definition_name:<str>, <pin_name:<str>, <instance_name:<str>)

Returns:

(Definition, Instance, Dict)

OptPins(pins=<function Definition.<lambda>>, dry_run=False, merge=True, absorb=True, remove_unconn=False)

This method optimizes the definitions pins bu inspecting all the instances of the definition

Parameters:

• dry_run (Just performs the dryrun and list the pins which can be merged or absorbed)

• pins (only consider specific pins, provide filter function)

• absorb (if two pins are only connected to each other they will be absorbed and internal connection will be made)

• merge (if two pins are connected to each other and few other instances, one of the pin will be absorbed and other will exist)

• remove_unconn (Remove unconnected pins)

OptWires(no_load=True, no_driver=False, floating=True)

List the wires which can be optimised based on different constraints

Parameters:

• no_load ((bool) (Default: True) Wires without load pin)

• no_driver ((bool) (Default: False) Wires without drivers pin)

• floating ((bool) (Default: True) Wires without any connection to pin)

duplicate_port(port, port_name=None)

Duplicates existing port in the definition Uses assign block beetween to short two cables If post in output port assign new_port = initial_port else assign initial_port = new_port

Parameters:

• port ((Port) Port of this definition)

• port_name ((str) Options New port name (default {port_name}_dup))

combine_cables(new_cable_name, cables, quiet=False)

Combines multiple cables to new cable. Helpful in creating Bus/Vector from scalar wires

Parameters:

• new_cable_name ((str) New cable name)

• cables ((list[Cable]) List of cables)

• quiet ((bool) Do not raise error if no cables are passed)

combine_ports(port_name, ports, is_downto=False)

This method can combine multiple input or output ports togther to create a bus structure.

It does create a cable for internal wires, but does not change anything about the external wire connection ports[0] will be newport[0] default properties will be used for creating a new port

Parameters:

• port_name (str) – Name of the new port

• ports (list[Ports]) – List of ports to combine

Returns:

return new port and internal cable

Return type:

(new_port, new_cable)

split_port_fanout(port, port_names=None)

Split the given port into multiple ports This is used to split the fanout ports

split_port(port)

Split the given port

Parameters:

port (Port) – Definition port to split into independent pins

flatten_instance(instance)

Flatterns single instance in the given definition

get_connectivity_network(get_weights=None, split_ports=False)

This method converts current module into networkx graph each cell is represented as as node and nets are represented as edges

• Netowrkx should be installed

• Higher fanout nets are represented with independent edge from driver

to each load

make_instance_unique(instance, new_name, instance_list=())

clone the definition and point the reference to the new definition

add_buffer(wire, buffer, instance_name, ports=('A', 'Y'), new_cable_name=None)

Adds buffer on the given net :Parameters: * wire (sdn.Wire, sdn.Cable) – Cable or a wire to be buffered

• buffer (str)

• instance_name (sdn.Instance)

• ports tuple (str, str)