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The other item that forms the interface to the package is the subprogram declaration A subprogram declaration allows the designer to specify the interface to a subprogram separately from the subprogram body This functionality allows any designers using the subprogram to start or continue with the design, while the specification of the internals of the subprograms are detailed It also gives the designer of the subprogram bodies freedom to change the internal workings of the subprograms, without affecting any designs that use the subprograms Following is an example of a subprogram declaration:
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PACKAGE cluspack IS TYPE nineval IS (Z0, Z1, ZX, TYPE nineval IS (R0, R1, RX, TYPE nineval IS (F0, F1, FX ); TYPE t_cluster IS ARRAY(0 to 15) OF nineval; TYPE t_clus_vec IS ARRAY(natural range <>) OF t_cluster; FUNCTION resolve_cluster( s: t_clus_vec ) RETURN t_cluster; SUBTYPE t_wclus IS resolve_cluster t_cluster; CONSTANT undriven : t_wclus; END cluspack;
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The subprogram declaration for resolve_cluster specifies the name of the subprogram, any arguments to the subprogram, their types and modes, and the return type if the subprogram is a function This declaration can be used to compile any models that intend to use it, without the
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actual subprogram body specified yet The subprogram body must exist before the simulator is built, during elaboration
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Package Body
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The main purpose of the package body is to define the values for deferred constants and specify the subprogram bodies for any subprogram declarations from the package declaration However, the package body can also contain the following declarations: I Subprogram declaration I Subprogram body I Type, subtype declaration I Constant declaration, which fills in the value for the deferred constant I File declaration I Alias declaration I Use clause All of the declarations in the package body, except for the constant declaration that is specifying the value of a deferred constant and the subprogram body declaration, are local to the package body Let s examine a package body for the package declaration that was discussed in the last section:
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PACKAGE BODY cluspack CONSTANT undriven : (ZX, ZX, ZX, ZX, ZX, ZX, ZX, ZX, ZX, ZX, ZX, ZX, IS t_wclus := ZX, ZX, ZX, ZX);
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FUNCTION resolve_cluster ( s: t_clus_vec ) return t_cluster IS VARIABLE result : t_cluster; VARIABLE drive_count : INTEGER; BEGIN IF s LENGTH = 0 THEN RETURN undriven; END IF; FOR i in s RANGE LOOP IF s(i) /= undriven THEN drive_count := drive_count + 1; IF drive_count = 1 THEN
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Subprograms and Packages
result := s(i); ELSE result := undriven; ASSERT FALSE REPORT multiple drivers detected SEVERITY ERROR; END IF; END IF; END LOOP; RETURN result; END resolve_cluster; END cluspack;
The package body statement is very similar to the package declaration, except for the keyword BODY after package The contents of the two design units are very different, however This package body example contains only two items: the deferred constant value for deferred constant undriven and the subprogram body for subprogram resolve_cluster Notice how the deferred constant value specification matches the deferred constant declaration in the package declaration, and the subprogram body matches the subprogram declaration in the package declaration The subprogram body must match the subprogram declaration exactly in the number of parameters, the type of parameters, and the return type A package body can also contain local declarations that are used only within the package body to create other subprogram bodies, or deferred constant values These declarations are not visible outside of the package body but can be very useful within the package body Following is an example of a complete package making use of this feature:
USE LIBRARY IEEE; USE IEEEstd_logic_1164ALL; PACKAGE math IS TYPE st16 IS ARRAY(0 TO 15) OF std_logic; FUNCTION add(a, b: IN st16) RETURN st16; FUNCTION sub(a, b: IN st16) RETURN st16; END math; PACKAGE BODY math IS FUNCTION vect_to_int(S : st16) RETURN INTEGER IS VARIABLE result : INTEGER := 0; BEGIN FOR i IN 0 TO 7 LOOP result := result * 2; IF S(i) = 1 THEN
result := result + 1; END IF; END LOOP; RETURN result; END vect_to_int;
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