VHSIC Description Language (VHDL) is outlined. VHDL is a proper notation meant to be used in all stages of the construction of digital structures. since it is either desktop readable and human readable, it helps the improvement, verification, synthesis, and trying out of designs; the conversation of layout info; and the upkeep, amendment, and procurement of undefined. Its fundamental audiences are the implementors of instruments aiding the language and the complicated clients of the language.
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Additional resources for 1076-2000 IEEE Standard VHDL Language Reference Manual
The range L downto R is called a descending range; if L < R, then the range is a null range. The smaller of L and R is called the lower bound, and the larger, the upper bound, of the range. The value V is said to belong to the range if the relations (lower bound <= V) and (V <= upper bound) are both true and the range is not a null range. The operators >, <, and <= in the preceding deﬁnitions are the predeﬁned operators of the applicable scalar type. For values of discrete or physical types, a value V1 is said to be to the left of a value V2 within a given range if both V1 and V2 belong to the range and either the range is an ascending range and V2 is the successor of V1, or the range is a descending range and V2 is the predecessor of V1.
The operators >, <, and <= in the preceding deﬁnitions are the predeﬁned operators of the applicable scalar type. For values of discrete or physical types, a value V1 is said to be to the left of a value V2 within a given range if both V1 and V2 belong to the range and either the range is an ascending range and V2 is the successor of V1, or the range is a descending range and V2 is the predecessor of V1. A list of values of a given range is in left to right order if each value in the list is to the left of the next value in the list within that range, except for the last value in the list.
The result of evaluating an expression that references a deferred constant before the elaboration of the corresponding full declaration is not deﬁned by the language. Example: package body TriState is function BitVal (Value: Tri) return Bit is constant Bits : Bit_Vector := "0100"; begin return Bits(Tri'Pos(Value)); end; 460 function TriVal (Value: Bit) return Tri is begin return Tri'Val(Bit'Pos(Value)); end; 465 function Resolve (Sources: TriVector) return Tri is variable V: Tri := 'Z'; begin for i in Sources'Range loop if Sources(i) /= 'Z' then if V = 'Z' then V := Sources(i); else return 'E'; end if; end if; end loop; return V; end; 470 475 480 end package body TriState ; 30 Copyright © 2000 IEEE.
1076-2000 IEEE Standard VHDL Language Reference Manual