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IEEE's 1076.1-1999 IEEE Standard for VHDL Analog and Mixed Signal PDF

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ISBN-10: 1559371870

ISBN-13: 9781559371872

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Extra info for 1076.1-1999 IEEE Standard for VHDL Analog and Mixed Signal Extensions

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If the prefix is an implicit signal GUARD, or a signal defined by the predefined attribute 'ABOVE, then the signal has no explicit ancestor. 22 Copyright © 1999 IEEE. All rights reserved. 1) or within the declarative region formed by the procedure; this rule also holds for the explicit ancestor, if any, of an implicit signal and also for the implicit signal GUARD. 3). Similarly, if a pure function subprogram contains a reference to an explicitly declared signal or variable object, or a slice or subelement (or slice thereof) of an explicit signal, then that object must be declared within the declarative region formed by the function; this rule also holds for the explicit ancestor, if any, of an implicit signal and also for the implicit signal GUARD.

Signal A, B: Word (1 to 4); signal C: Word (5 downto 0); Instance: entity E generic map ((1 to 2) => (others => '0')) port map (A, Op2(3 to 4) => B (1 to 2), Op2(2) => B (3), Result => C (3 downto 1)); -- In this instance, the index range of ROM is 1 to 2 (matching that of the actual), -- The index range of Op1 is 1 to 4 (matching the index range of A), the index range -- of Op2 is 2 to 4, and the index range of Result is (3 downto 1) -- (again matching the index range of the actual). 2 Predefined array types The predefined array types are STRING, REAL_VECTOR, and BIT_VECTOR, defined in package STANDARD in Clause 14.

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.

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1076.1-1999 IEEE Standard for VHDL Analog and Mixed Signal Extensions by IEEE


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