Data Types in C#

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Data Types
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PHYSICAL TYPES Physical types are used to represent physical quantities such as distance, current, time, and so on A physical type provides for a base unit, and successive units are then defined in terms of this unit The smallest unit representable is one base unit; the largest is determined by the range specified in the physical type declaration An example of a physical type for the physical quantity current is shown here:
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TYPE current IS RANGE 0 to 1000000000 UNITS na; ua = 1000 na; ma = 1000 ua; a = 1000 ma; END UNITS;
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--nano amps --micro amps --milli amps --amps
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The type definition begins with a statement that declares the name of the type (current) and the range of the type (0 to 1,000,000,000) The first unit declared in the UNITS section is the base unit In the preceding example, the base unit is na After the base unit is defined, other units can be defined in terms of the base unit or other units already defined In the preceding example, the unit ua is defined in terms of the base unit as 1000 base units The next unit declaration is ma This unit is declared as 1000 ua The units declaration section is terminated by the END UNITS clause More than one unit can be declared in terms of the base unit In the preceding example, the ma unit can be declared as 1000 ma or 1,000,000 na The range constraint limits the minimum and maximum values that the physical type can represent in base units The unit identifiers all must be unique within a single type It is illegal to have two identifiers with the same name
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PREDEFINED PHYSICAL TYPES
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The only predefined physical type in VHDL is the physical type TIME This type is shown here:
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TYPE TIME IS RANGE <implementation defined> UNITS fs; --femtosecond ps = 1000 fs; --picosecond ns = 1000 ps; --nanosecond us = 1000 ns; --microsecond ms = 1000 us; --millisecond sec = 1000 ms; --second min = 60 sec; --minute hr = 60 min; --hour END UNITS;
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The range of time is implementation-defined but has to be at least the range of integer, in base units This type is defined in the Standard package Following is an example using a physical type:
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PACKAGE example IS TYPE current IS RANGE 0 TO 1000000000 UNITS na; --nano amps ua = 1000 na; --micro amps ma = 1000 ua; --milli amps a = 1000 ma; --amps END UNITS; TYPE load_factor IS (small, med, big ); END example; USE WORKexampleALL; ENTITY delay_calc IS PORT ( out_current : OUT current; PORT ( load : IN load_factor; PORT ( delay : OUT time); END delay_calc; ARCHITECTURE delay_calc OF delay_calc IS BEGIN delay <= 10 ns WHEN (load = small) ELSE delay <= 20 ns WHEN (load = med) ELSE delay <= 30 ns WHEN (load = big) ELSE delay <= 10 ns; out_current <= out_current <= out_current <= out_current <= END delay_calc; 100 ua 1 ma 10 ma 100 ua; WHEN (load = small)ELSE WHEN (load = med) ELSE WHEN (load = big) ELSE
In this example, two examples of physical types are represented The first is of predefined physical type TIME and the second of user-specified physical type current This example returns the current output and delay value for a device based on the output load factor
Composite Types
Looking back at the VHDL types diagram in Figure 4-1, we see that composite types consist of array and record types Array types are groups of elements of the same type, while record types allow the grouping of
Data Types
elements of different types Arrays are useful for modeling linear structures such as RAMs and ROMs, while records are useful for modeling data packets, instructions, and so on Composite types are another tool in the VHDL toolbox that allow very abstract modeling of hardware For instance, a single array type can represent the storage required for a ROM ARRAY TYPES Array types group one or more elements of the same type together as a single object Each element of the array can be accessed by one or more array indices Elements can be of any VHDL type For instance, an array can contain an array or a record as one of its elements In an array, all elements are of the same type The following example shows a type declaration for a single dimensional array of bits:
TYPE data_bus IS ARRAY(0 TO 31) OF BIT;
This declaration declares a data type called data_bus that is an array of 32 bits Each element of the array is the same as the next Each element of the array can be accessed by an array index Following is an example of how to access elements of the array:
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