UVM TLM Sockets

UVMkit » 1800.2-2020

Each uvm_tlm_*_socket class is derived from a corresponding uvm_tlm_*_socket_base class. The base class contains most of the implementation of the class, The derived classes (in this file) contain the connection semantics.

Sockets come in several flavors: Each socket is either an initiator or a target, a pass-through or a terminator. Further, any particular socket implements either the blocking interfaces or the nonblocking interfaces. Terminator sockets are used on initiators and targets as well as interconnect components as shown in the figure above. Pass-through sockets are used to enable connections to cross hierarchical boundaries.

There are eight socket types: the cross of blocking and nonblocking, pass-through and termination, target and initiator

Sockets are specified based on what they are (IS-A) and what they contains (HAS-A). IS-A and HAS-A are types of object relationships. IS-A refers to the inheritance relationship and HAS-A refers to the ownership relationship. For example if you say D is a B that means that D is derived from base B. If you say object A HAS-A B that means that B is a member of A.

Contents

UVM TLM Sockets	Each uvm_tlm__socket class is derived from a corresponding uvm_tlm__socket_base class.
uvm_tlm_b_initiator_socket	IS-A forward port; has no backward path except via the payload contents
uvm_tlm_b_target_socket	IS-A forward imp; has no backward path except via the payload contents.
uvm_tlm_nb_initiator_socket	IS-A forward port; HAS-A backward imp
uvm_tlm_nb_target_socket	IS-A forward imp; HAS-A backward port
uvm_tlm_b_passthrough_initiator_socket	IS-A forward port;
uvm_tlm_nb_passthrough_initiator_socket	IS-A forward port; HAS-A backward export
uvm_tlm_nb_passthrough_target_socket	IS-A forward export; HAS-A backward port

uvm_tlm_b_initiator_socket

IS-A forward port; has no backward path except via the payload contents

Summary

uvm_tlm_b_initiator_socket

IS-A forward port; has no backward path except via the payload contents

Class Hierarchy

uvm_tlm_b_initiator_socket_base#(T)

uvm_tlm_b_initiator_socket

Class Declaration

class uvm_tlm_b_initiator_socket #(
type T = uvm_tlm_generic_payload

) extends uvm_tlm_b_initiator_socket_base #(T)

uvm_tlm_b_target_socket

IS-A forward imp; has no backward path except via the payload contents.

The component instantiating this socket must implement a b_transport() method with the following signature

task b_transport(T t, uvm_tlm_time delay);

Summary

uvm_tlm_b_target_socket

IS-A forward imp; has no backward path except via the payload contents.

Class Hierarchy

uvm_tlm_b_target_socket_base#(T)

uvm_tlm_b_target_socket

Class Declaration

class uvm_tlm_b_target_socket #(
type IMP = int,
type T = uvm_tlm_generic_payload

) extends uvm_tlm_b_target_socket_base #(T)

uvm_tlm_nb_initiator_socket

IS-A forward port; HAS-A backward imp

The component instantiating this socket must implement a nb_transport_bw() method with the following signature

function uvm_tlm_sync_e nb_transport_bw(T t, ref P p, input uvm_tlm_time delay);

Summary

uvm_tlm_nb_initiator_socket

IS-A forward port; HAS-A backward imp

Class Hierarchy

uvm_tlm_nb_initiator_socket_base#(T,P)

uvm_tlm_nb_initiator_socket

Class Declaration

class uvm_tlm_nb_initiator_socket #(
    type IMP = int,
    type T = uvm_tlm_generic_payload,
    type P = uvm_tlm_phase_e

) extends uvm_tlm_nb_initiator_socket_base #(T,P)

uvm_tlm_nb_target_socket

IS-A forward imp; HAS-A backward port

The component instantiating this socket must implement a nb_transport_fw() method with the following signature

function uvm_tlm_sync_e nb_transport_fw(T t, ref P p, input uvm_tlm_time delay);

Summary

uvm_tlm_nb_target_socket

IS-A forward imp; HAS-A backward port

Class Hierarchy

uvm_tlm_nb_target_socket_base#(T,P)

uvm_tlm_nb_target_socket

Class Declaration

class uvm_tlm_nb_target_socket #(
    type IMP = int,
    type T = uvm_tlm_generic_payload,
    type P = uvm_tlm_phase_e

) extends uvm_tlm_nb_target_socket_base #(T,P)

uvm_tlm_b_passthrough_initiator_socket

IS-A forward port;

Summary

uvm_tlm_b_passthrough_initiator_socket

IS-A forward port;

Class Hierarchy

uvm_tlm_b_passthrough_initiator_socket_base#(T)

uvm_tlm_b_passthrough_initiator_socket

Class Declaration

class uvm_tlm_b_passthrough_initiator_socket #(
type T = uvm_tlm_generic_payload

) extends uvm_tlm_b_passthrough_initiator_socket_base #(T)

uvm_tlm_nb_passthrough_initiator_socket

IS-A forward port; HAS-A backward export

Summary

uvm_tlm_nb_passthrough_initiator_socket

IS-A forward port; HAS-A backward export

Class Hierarchy

uvm_tlm_nb_passthrough_initiator_socket_base#(T,P)

uvm_tlm_nb_passthrough_initiator_socket

Class Declaration

class uvm_tlm_nb_passthrough_initiator_socket #(
type T = uvm_tlm_generic_payload,
type P = uvm_tlm_phase_e

) extends uvm_tlm_nb_passthrough_initiator_socket_base #(T,P)

uvm_tlm_nb_passthrough_target_socket

IS-A forward export; HAS-A backward port

Summary

uvm_tlm_nb_passthrough_target_socket

IS-A forward export; HAS-A backward port

Class Hierarchy

uvm_tlm_nb_passthrough_target_socket_base#(T,P)

uvm_tlm_nb_passthrough_target_socket

Class Declaration

class uvm_tlm_nb_passthrough_target_socket #(
type T = uvm_tlm_generic_payload,
type P = uvm_tlm_phase_e

) extends uvm_tlm_nb_passthrough_target_socket_base #(T,P)