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Additional resources for 1076.1-1999 IEEE Standard for VHDL Analog and Mixed Signal Extensions
NOTE—The rules concerning constrained type declarations mean that a type declaration with a constrained array definition such as type T is array (POSITIVE range MINIMUM to MAX) of ELEMENT; is equivalent to the sequence of declarations subtype index_subtype is POSITIVE range MINIMUM to MAX; type array_type is array (index_subtype range <>) of ELEMENT; subtype T is array_type (index_subtype); where index_subtype and array_type are both anonymous. Consequently, T is the name of a subtype and all objects declared with this type mark are arrays that have the same index range.
An implementation may restrict the bounds of the range constraint of a physical type. However, an implementation must allow the declaration of any physical type whose range is wholly contained within the bounds –2147483647 and +2147483647 inclusive. Examples: type DURATION is range –1E18 to 1E18 units fs; -ps = 1000 fs; -ns = 1000 ps; -us = 1000 ns; -ms = 1000 us; -sec = 1000 ms; -- 34 femtosecond picosecond nanosecond microsecond millisecond second Copyright © 1999 IEEE. All rights reserved. 34 inch / m; NOTES 1— The 'POS and 'VAL attributes may be used to convert between abstract values and physical values.
1 Predefined floating point types The only predefined floating point type is the type REAL. 0E38 inclusive. It is defined with an ascending range. NOTE—The range of REAL in a particular implementation may be determined from the 'LOW and 'HIGH attributes. 36 Copyright © 1999 IEEE. All rights reserved. 2 Composite types Composite types are used to define collections of values. These include both arrays of values (collections of values of a homogeneous type) and records of values (collections of values of potentially heterogeneous types).