Group declaration

group identifier : group_ template _name ( group_constituent_list ) ;

• entity_declarative_part
• architecture_declarative_part
• configuration_declarative_part
• package
• package_body
• block_declarative_part
• function_declarative_part
• procedure_declarative_part
• process_declarative_part

group_constituent { , group_constituent }

• name
• character_literal

Groups of type pin2pin are declared.

GROUP pinpair1 : pin2pin (clk, q1) ;

GROUP pinpair2 : pin2pin (clk, q2) ;

A group of the former declared groups.

GROUP clocked : gog (pinpair1, pinpair2);

• The group template path is declared.
• The group a_to_s is declared.
• The attribute propagation_delay is declared.
• The attribute propagation_delay is assigned to a_to_s and is given the value of 250 ns.

GROUP path IS ( SIGNAL , SIGNAL ) ;
GROUP a_to_s : path (a,s) ;
 
ATTRIBUTE propagation_delay : time ;
ATTRIBUTE propagation_delay OF a_to_s :
               GROUP IS 250 ns ;

• The group template pin_set is declared.
• The gourp template paths is declared.
• The group of signals sources and targets are declared.
• The group of groups ins_to_outs is declared.
• The attribute propagation_delay is declared.
• The attribute propagation_delay is assigned to ins_to_outs and is given the value of delay .

GROUP pin_set IS ( SIGNAL <>) ;
GROUP paths IS ( GROUPS <>) ;
 
GROUP sources : pin_set (inp1, inp2) ;
GROUP targets : pin_set (outp1, outp2) ;
GROUP ins_to_outs : paths (sources,
                           targets) ;
 
ATTRIBUTE propagation_delay : time ;
ATTRIBUTE propagation_delay OF
          ins_to_outs : GROUP IS delay ;