VHSIC Description Language (VHDL) is outlined. VHDL is a proper notation meant to be used in all levels of the production of digital platforms. since it is either computing device readable and human readable, it helps the improvement, verification, synthesis, and trying out of designs; the communique of layout information; and the upkeep, amendment, and procurement of undefined. Its basic audiences are the implementors of instruments assisting the language and the complex clients of the language.
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Additional info for 1076-2000 IEEE Standard VHDL Language Reference Manual
225 2— The value of a physical literal, whose abstract literal is either the integer value zero or the ﬂoating point value zero, is the same value (speciﬁcally zero primary units) no matter what unit name follows the abstract literal. 1 Predeﬁned physical types The only predeﬁned physical type is type TIME. The range of TIME is implementation dependent, but it is guaranteed to include the range –2147483647 to +2147483647. It is deﬁned with an ascending range. All 38 Copyright © 2000 IEEE. All rights reserved.
An enumeration type is said to be a character type if at least one of its enumeration literals is a character literal. Each enumeration literal yields a different enumeration value. The predeﬁned order relations between enumeration values follow the order of corresponding position numbers. The position number of the value of the ﬁrst listed enumeration literal is zero; the position number for each additional enumeration literal is one more than that of its predecessor in the list. 90 If the same identiﬁer or character literal is speciﬁed in more than one enumeration type deﬁnition, the corresponding literals are said to be overloaded.
Unit names declared in secondary unit declarations must be directly or indirectly deﬁned in terms of integral multiples of the primary unit of the type declaration in which they appear. The position numbers of unit names need not lie within the range speciﬁed by the range constraint. If a simple name appears at the end of a physical type declaration, it must repeat the identiﬁer of the type declaration in which the physical type deﬁnition is included. 170 The abstract literal portion (if present) of a physical literal appearing in a secondary unit declaration must be an integer literal.
1076-2000 IEEE Standard VHDL Language Reference Manual