qr code reader c# windows phone 8.1 Figure 4-2 Rom Data Representation in Visual C#

Decode QR Code JIS X 0510 in Visual C# Figure 4-2 Rom Data Representation

Figure 4-2 Rom Data Representation
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The structure of the aggregate must match the structure of the data type for the assignment to occur Following is a simple example of an aggregate assignment:
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PROCESS(X) TYPE bitvec IS ARRAY(0 TO 3) OF BIT; VARIABLE Y : bitvec; BEGIN Y := ( 1 , 0 , 1 , 0 ); END PROCESS;
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Variable Y has an element of type BIT in the aggregate for each element of its type In this example, the variable Y is 4 bits wide, and the aggregate is 4 bits wide as well The constant rom_data from the rom example is an array of arrays Each element of type mem_data is an array of type data_out The aggregate assignment for an array of arrays can be represented by the form shown here:
value := ((e1, e2, ,en), ,(e1, e2, ,en)); E1 En
This is acceptable, but a much more readable form is shown here:
Data Types
value value value value value := := := := := ((e1, e2, , ((e1, e2, , ((( ((( ((e1, e2, , en), en), en) ) --E1 --E2
--En
In the statement part of the rom example, there is one conditional signal assignment statement The output port data is assigned a value based on the value of the cs input The data type of the value assigned to port data must be of type data_out because port data has a type of data_out By addressing the rom_data constant with an integer value, a data type of data_out is returned A single value can be returned from the array of arrays by using the following syntax:
bit_value := rom_data(addr) (bit_index);
The first index (addr) returns a value with a data type of data_out The second index (bit_index) indexes the data_out type and returns a single element of the array
MULTIDIMENSIONAL ARRAYS The constant rom_data in the rom example was represented using an
array of arrays Following is another method for representing the data with a multidimensional array:
TYPE mem_data_md IS ARRAY(0 TO memsize, 0 TO width) OF std_logic; CONSTANT ( ( 0 , ( ( 0 , ( ( 0 , ( ( 0 , ( ( 0 , ( ( 0 , ( ( 0 , (( 0 , rom_data_md : mem_data := 0 , 0 , 0 ), 0 , 0 , 1 ), 0 , 1 , 0 ), 0 , 1 , 1 ), 1 , 0 , 0 ), 1 , 0 , 1 ), 1 , 1 , 0 ), 1 , 1 , 1 ) );
The declaration shown here declares a two-dimensional array type
mem_data_md When constant rom_data_md is declared using this type, the
initialization syntax remains the same, but the method of accessing an element of the array is different In the following example, a single element of the array is accessed:
X := rom_data_md(3, 3);
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This access returns the fourth element of the fourth row, which, in this example, is a 1
UNCONSTRAINED ARRAY TYPES
An unconstrained array type is a type whose range or size is not completely specified when the type is declared This allows multiple subtypes to share a common base type Entities and subprograms can then operate on all of the different subtypes with a single subprogram, instead of a subprogram or entity per size Following is an example of an unconstrained type declaration:
TYPE BIT_VECTOR IS ARRAY(NATURAL RANGE <>) OF BIT;
This is the type declaration for type BIT_VECTOR from the Standard package This type declaration declares a type that is an array of type BIT However, the number of elements of the array is not specified The notation that depicts this is:
RANGE <>
This notation specifies that the type being defined has an unconstrained range The word NATURAL before the keyword RANGE, in the type declaration, specifies that the type is bounded only by the range of NATURAL Type NATURAL is defined in the Standard package to have a range from 0 to integer high (the largest integer value) Type BIT_VECTOR, then, can range in size from 0 elements to integer high elements Each element of the BIT_VECTOR type is of type BIT Unconstrained types are typically used as types of subprogram arguments, or entity ports These entities or subprograms can be passed items of any size within the range of the unconstrained type For instance, let s assume that a designer wants a shift-right function for type BIT_VECTOR The function uses the unconstrained type BIT_VECTOR as the type of its ports, but it can be passed any type that is a subtype of type BIT_VECTOR Let s walk through an example to illustrate how this works Following is an example of an unconstrained shift-right function:
PACKAGE mypack IS SUBTYPE eightbit IS BIT_VECTOR(0 TO 7); SUBTYPE fourbit IS BIT_VECTOR(0 TO 3); FUNCTION shift_right(val : BIT_VECTOR) RETURN BIT_VECTOR; END mypack; PACKAGE BODY mypack IS FUNCTION shift_right(val : BIT_VECTOR) RETURN BIT_VECTOR
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