4 Information requirements

This clause specifies the information requirements for the Fabrication joint application module. The information requirements are specified as the Application Reference Model (ARM) of this application module.

NOTE 1  A graphical representation of the information requirements is given in Annex C.

NOTE 2  The mapping specification is specified in 5.1. It shows how the information requirements are met by using common resources and constructs defined or imported in the MIM schema of this application module.

This clause defines the information requirements to which implementations shall conform using the EXPRESS language as defined in ISO 10303-11. The following begins the Fabrication_joint_arm schema and identifies the necessary external references.

4.1 Required AM ARMs

The following EXPRESS interface statements specify the elements imported from the ARMs of other application modules.

EXPRESS specification:

*)
USE FROM Land_arm;    --  ISO/TS 10303-1692



USE FROM Layered_interconnect_module_with_printed_component_design_arm;    --  ISO/TS 10303-1700



REFERENCE FROM Support_resource_arm    --  ISO/TS 10303-1800
  (bag_to_set);
(*



NOTE 1   The schemas referenced above are specified in the following part of ISO 10303:

Land_arm	ISO/TS 10303-1692
Layered_interconnect_module_with_printed_component_design_arm	ISO/TS 10303-1700
Support_resource_arm	ISO/TS 10303-1800

NOTE 2   See Annex C, Figures C.1and C.2 for a graphical representation of this schema.

4.2 ARM type definition

This subclause specifies the ARM type for this application module. The ARM type and definition is specified below.

4.2.1 fabricated_feature_select   

The fabricated_feature_select type allows for the designation of the data types Component_termination_passage_join_terminal, Conductive_interconnect_element_terminal, Embedded_physical_component_terminal, Land_join_terminal, Printed_component_join_terminal, and Via_terminal.

EXPRESS specification:

*)
TYPE fabricated_feature_select = SELECT
   (Component_termination_passage_join_terminal,
    Conductive_interconnect_element_terminal,
    Embedded_physical_component_terminal,
    Land_join_terminal,
    Printed_component_join_terminal,
    Via_terminal);
END_TYPE;
(*

4.3 ARM entity definitions

This subclause specifies the ARM entities for this module. Each ARM application entity is an atomic element that embodies a unique application concept and contains attributes specifying the data elements of the entity. The ARM entities and definitions are specified below.

4.3.1 Connection_zone_based_fabrication_joint   

A Connection_zone_based_fabrication_joint is a type of Fabrication_joint. A Connection_zone_based_fabrication_joint specializes the definition of Fabrication_joint by providing additional detail showing specific connection areas on each end of the joint. zone_1 is a connection area on fabrication_feature_1 and zone_2 is a connection area on fabrication_feature_2.

NOTE 1   A Connection_zone_based_fabrication_joint is rarely used. Implementation projects should carefully review the source data to validate the implementation requirement before implementing this Application Object.

EXPRESS specification:

*)
ENTITY Connection_zone_based_fabrication_joint
  SUBTYPE OF (Fabrication_joint);
  zone_1 : Connection_zone_in_design_view;
  zone_2 : Connection_zone_in_design_view;
WHERE
  WR1: zone_1 :<>: zone_2;
END_ENTITY;
(*

Attribute definitions:

zone_1: specifies a role of the Connection_zone_in_design_view for the Connection_zone_based_fabrication_joint.

zone_2: specifies a role of the Connection_zone_in_design_view for the Connection_zone_based_fabrication_joint.

NOTE 2   There are no semantics associated with the sequence of zones in a Connection_zone_based_fabrication_joint.

Formal propositions:

WR1: The zone_1 shall not be zone_2.

4.3.2 Fabrication_joint   

A Fabrication_joint is a type of Component_feature_joint. A Fabrication_joint identifies a joint that is created in the fabrication of a printed circuit board. A Fabrication_joint is usually provided only when it is necessary to state that an intersection of a Conductive_interconnect_element and Land includes additional material. A Fabrication_joint may be used when the preferred method of asserting that a joint exists between a Land and a Conductive_interconnect_element is unsuitable. The preferred method of asserting that a joint exists between a Land and a Conductive_interconnect_element is to populate a member of Layer_connection_point at the same location as the Land and specify that the Layer_connection_point is in the role of location for the Conductive_interconnect_element_terminal that is in the role of access_mechanisms for the Conductive_interconnect_element.

NOTE 1   The preferred method of asserting that a joint exists between the Land and the Conductive_interconnect_element may be unsuitable when the pre-processor uses the end point of the centreline of the Conductive_interconnect_element as a location of the Layer_connection_point but the centreline of the Conductive_interconnect_element does not intersect the Cartesian_point associated with the location of the Land.

EXAMPLE 1   Figure 1 is a plan view of the construction of a Fabrication_joint between a Land and a Conductive_interconnect_element where both contribute to a Conductor segment. This figure illustrates the geometric relationship of the element terminals in the construction of the segment. In this example, the Fabrication_joint is provided because auxiliary material intended to increase manufacturability of the local metalization in the area of the intersection is provided.

NOTE 2   The placement of the of the Conductive_interconnect_element in Figure 1 is atypical of usual design practice and is provided only for illustrative purposes. Normal design practice with this geometry would be for the end of the Conductive_interconnect_element to be conguent with the center of the Land.

NOTE 3   A Fabrication_joint may be provided by a pre-processor where there are known accuracy issues regarding the location of the intersection of a Conductive_interconnect_element and a Land and it is necessary to provide auxiliary information that indicates the intent of the designer.

NOTE 4   A Fabrication_joint may be used where there is a need to do a detailed analysis of manufacturing process variations due to use of state of the art feature size and spacing dimensions.

NOTE 5   Fabrication joint is not a native CAD system concept and must be synthesized as needed by a pre-processor.

EXAMPLE 2   Figure 2 is a cross-sectional view of the construction of a Fabrication_joint between a Land and a Component_termination_passage.

EXPRESS specification:

*)
ENTITY Fabrication_joint
  SUBTYPE OF (Component_feature_joint);
  SELF\Component_feature_joint.feature_1 RENAMED fabrication_feature_1 : fabricated_feature_select;
  SELF\Component_feature_joint.feature_2 RENAMED fabrication_feature_2 : fabricated_feature_select;
  auxiliary_joint_material : OPTIONAL Stratum_feature_template_component;
  SELF\Shape_element.associated_definition : Layered_interconnect_module_design_view;
WHERE
  WR1: fabrication_feature_1 <> fabrication_feature_2;
  WR2: TYPEOF(fabrication_feature_1) <> TYPEOF(auxiliary_joint_material);
  WR3: TYPEOF(fabrication_feature_2) <> TYPEOF(auxiliary_joint_material);
END_ENTITY;
(*

Attribute definitions:

fabrication_feature_1: specifies one role of the fabricated_feature_select for the Fabrication_joint.

fabrication_feature_2: specifies one role of the fabricated_feature_select for the Fabrication_joint.

auxiliary_joint_material: specifies the role of the Stratum_feature_template_component for the Fabrication_joint. The value of this attribute need not be specified.

associated_definition: specifies the role of the Layered_interconnect_module_design_view for the Fabrication_joint.

Formal propositions:

WR1: The fabrication_feature_1 shall not be the fabrication_feature_2.

WR2: The fabrication_feature_1 shall not be the auxiliary_joint_material.

WR3: The fabrication_feature_2 shall not be the auxiliary_joint_material.

4.3.3 Passage_terminal_based_fabrication_joint_link   

EXPRESS specification:

*)
ENTITY Passage_terminal_based_fabrication_joint_link;
  associated_terminal : fabricated_feature_select;
  precedent_point : Fabrication_joint;
  subsequent_point : Fabrication_joint;
UNIQUE
  UR1: associated_terminal, precedent_point, subsequent_point;
WHERE
  WR1: precedent_point <> subsequent_point;
  WR2: precedent_point.fabrication_feature_2 = associated_terminal;
  WR3: subsequent_point.fabrication_feature_1 = associated_terminal;
  WR4: SIZEOF(TYPEOF(associated_terminal) * ['LAYERED_INTERCONNECT_MODULE_DESIGN_ARM.' + 'COMPONENT_TERMINATION_PASSAGE_JOIN_TERMINAL', 'LAYERED_INTERCONNECT_MODULE_DESIGN_ARM.' + 'VIA_TERMINAL']) = 1;
  WR5: acyclic_passage_terminal_based_fabrication_joint_link (SELF, [subsequent_point], 'FABRICATION_JOINT_ARM.PASSAGE_TERMINAL_BASED_FABRICATION_JOINT_LINK');
END_ENTITY;
(*

Attribute definitions:

associated_terminal: specifies the role of the fabricated_feature_select for the Passage_terminal_based_fabrication_joint_link.

precedent_point: specifies the role of the Fabrication_joint for the Passage_terminal_based_fabrication_joint_link.

subsequent_point: specifies the role of the Fabrication_joint for the Passage_terminal_based_fabrication_joint_link.

Formal propositions:

UR1: The combination of associated_terminal, precedent_point and subsequent_point shall be unique within a population of Passage_terminal_based_fabrication_joint_link.

WR1: The precedent_point shall not be the subsequent_point.

WR2: The terminal referenced by the fabrication_feature_2 attribute of the Fabrication_joint referenced by precedent_point shall be the terminal referenced by associated_terminal.

WR3: The terminal referenced by the fabrication_feature_1 attribute of the Fabrication_joint referenced by subsequent_point shall be the terminal referenced by associated_terminal.

WR4: The associated_terminal shall only be of type Component_termination_passage_join_terminal, or of type Via_terminal.

WR5: The graph of instances of the Application Object Passage_terminal_based_fabrication_joint_link shall not contain a cycle.

4.4 ARM function definition

This subclause specifies the ARM function for this module. The ARM function and definition is specified below.

4.4.1 acyclic_passage_terminal_based_fabrication_joint_link

EXPRESS specification:

LOCAL
       x : SET OF Passage_terminal_based_fabrication_joint_link;
     END_LOCAL;

     IF relation.precedent_point IN relatives THEN
       RETURN (FALSE);
     END_IF;
     x := QUERY(pd <* bag_to_set(USEDIN(relation.precedent_point,
       'FABRICATION_JOINT_ARM.' + 'PASSAGE_TERMINAL_BASED_FABRICATION_JOINT_LINK.' +
       'SUBSEQUENT_POINT')) | specific_relation IN TYPEOF(pd));
     REPEAT i := 1 TO HIINDEX(x);
       IF NOT acyclic_passage_terminal_based_fabrication_joint_link(x[i],
         relatives + relation.precedent_point, specific_relation) THEN
         RETURN (FALSE);
       END_IF;
     END_REPEAT;
   RETURN (TRUE);

Argument definitions:

relation: the specified Passage_terminal_based_fabrication_joint_link.

relatives: the specified set of Fabrication_joint.

specific_relation: the specified STRING.

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