barcode scanner c# code project D: VHDL93 Updates in Visual C#.NET

Scanner QR Code 2d barcode in Visual C#.NET D: VHDL93 Updates

Appendix D: VHDL93 Updates
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An alternate way of opening the file without calling the explicit FILE_OPEN procedure is similar to the method used in VHDL87 This method uses a file declaration similar to the one in VHDL87, that specifies the name of the file object, the mode of the file object, and the external filename to be associated with the file object as shown here:
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FILE infile : int_file OPEN READ_MODE IS /doug/test/ example3 ;
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This effectively calls the FILE_OPEN procedure as follows:
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FILE_OPEN(infile, /doug/test/example3 , READ_MODE);
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When a file type declaration of a particular type_mark is declared the following declarations are implicitly declared
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TYPE FT IS FILE OF type_mark; PROCEDURE FILE_OPEN( FILE F : FT; EXTERNAL_NAME : IN STRING; OPEN_KIND : IN FILE_OPEN_KIND := READ_MODE); PROCEDURE FILE_OPEN( STATUS : OUT FILE_OPEN_STATUS; FILE F : FT; EXTERNAL_NAME : IN STRING; OPEN_KIND : IN FILE_OPEN_KIND := READ_MODE); PROCEDURE FILE_CLOSE( FILE F : FT); PROCEDURE READ( FILE F : FT; VALUE : OUT type_mark); PROCEDURE WRITE( FILE F : FT; VALUE : OUT type_mark); PROCEDURE ENDFILE( FILE F : FT) RETURN BOOLEAN;
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The file type declaration declares a file of type type_mark With the file type declaration all of the above procedures are implicitly declared Once these procedures are declared they can be used to read and write files of the type_mark
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Foreign Interface
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In VHDL87 it was possible to call functions and procedures that were not described using VHDL It was possible but limited in scope and not very well defined The VHDL93 package standard now contains an attribute
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Appendix D: VHDL93 Updates
called FOREIGN whose value is a string This string value describes the interface to the external function, procedure, or entity The value of this string is not standardized and depends on the type of the external code being called An example might look as follows:
FUNCTION beep( length : INTEGER) IS ATTRIBUTE FOREIGN OF beep : FUNCTION IS sysbeep(length) ; BEGIN END FUNCTION beep;
In this example, a function called beep is declared that contains a FOREIGN attribute The FOREIGN attribute specifies that the body of this function will be implemented by code other than VHDL The string value of the attribute declares the interface expected between function beep and the foreign code to implement the function However, the string value is not defined in VHDL93 to be anything more than just a string
Generate Statement Changes
In a minor addition, VHDL93 adds a declaration section to the generate statement Any declarations before the BEGIN clause are local only to the generate statement
g1: FOR k IN 0 TO 3 GENERATE SIGNAL reset : STD_LOGIC; BEGIN dffx : dff PORT MAP( z(i), reset, clk, z(i + 1)); END GENERATE;
The generate statement above declares local signal reset This signal is local only to the generate statement
Globally Static Assignment
VHDL93 adds a new feature that allows globally static values to be assigned to port maps In VHDL87 port maps could only bind formal parameters to signals In VHDL93 this has been generalized to include expressions as well These expressions have to be globally static, or known at elaboration time
Appendix D: VHDL93 Updates
u1: mux4 PORT MAP( k0 => s0, k1 => s1, k2 => s2, en => 1 , q => outp);
In the example above the value 1 is mapped to port en In VHDL87 a separate signal would have to be created, assigned to the value 1, and then mapped to port en The globally static value does not have to be just a simple value, it can be any expression known at compile time that matches the type of the port
Groups
It is sometimes useful while modeling to declare an attribute that is to apply to more than one object Especially in writing synthesizable models some attributes are useful to describe behavior for an entire section of a model In VHDL87 there was no way to describe this type of attribute structure VHDL93 has the concept of groups which allows an attribute to pertain to all objects in the group A group starts with a group template declaration such as shown here:
GROUP timing_arc IS (SIGNAL, SIGNAL);
This describes a group template called timing_arc that is a group of two signal objects After the group template is declared a group declaration can be declared as shown here:
GROUP clk_to_q : timing_arc(clk, q); GROUP rst_to_q : timing_arc(rst, q); GROUP set_to_q : timing_arc(set, q);
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