Read e-book online 1076-2000 IEEE Standard VHDL Language Reference Manual PDF

ISBN-10: 0738119482

ISBN-13: 9780738119489

VHSIC Description Language (VHDL) is outlined. VHDL is a proper notation meant to be used in all levels of the construction of digital platforms. since it is either desktop readable and human readable, it helps the improvement, verification, synthesis, and trying out of designs; the conversation of layout facts; and the upkeep, amendment, and procurement of undefined. Its basic audiences are the implementors of instruments assisting the language and the complicated clients of the language.

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The position number of an integer value is the corresponding value of the type universal_integer. 2). It is an error if the execution of such an operation (in particular, an implicit conversion) cannot deliver the correct result (that is, if the value corresponding to the mathematical result is not a value of the integer type). An implementation may restrict the bounds of the range constraint of integer types other than type universal_integer. However, an implementation must allow the declaration of any integer type whose range is wholly contained within the bounds –2147483647 and +2147483647 inclusive.

These include both arrays of values (collections of values of a homogeneous type) and records of values (collections of values of potentially heterogeneous types). composite_type_definition ::= array_type_definition | record_type_definition 280 An object of a composite type represents a collection of objects, one for each element of the composite object. A composite type may only contain elements that are of scalar, composite, or access types; elements of file types or protected types are not allowed in a composite type.

415 420 IEEE Std 1076, 2000 Edition For an interface object of mode inout or linkage, the index ranges determined by the first rule must be identical to the index ranges determined by the second rule. Examples: 425 type Word is array (NATURAL range <>) of BIT; type Memory is array (NATURAL range <>) of Word (31 downto 0); constant A_Word: Word := "10011"; -- The index range of A_Word is 0 to 4 430 entity E is generic (ROM: Memory); port (Op1, Op2: in Word; Result: out Word); Copyright © 2000 IEEE.

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1076-2000 IEEE Standard VHDL Language Reference Manual

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