what is the use of attribute

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grittinjames

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pin_assign xilinx

hai
im very new to vhdl, while checking an example program i had seen this attribute

some one plz explai this


attribute pin_assign : string;
attribute pin_assign of clk : signal is "A7";
attribute pin_assign of left : signal is "G7";
attribute pin_assign of right : signal is "B2";
attribute pin_assign of stop : signal is "F2";
attribute pin_assign of q : signal is "G5 F6 C6 B4";
 

attribute pin_assign of clk : signal is a7;

Those attributes assign package pin numbers to various signals.

Some VHDL compilers don't try to interpret attributes. They simply pass them to the next step, such as place-and-route.

If you use a different synthesis tool, you may need to modify the attributes according to your tool's requirements. For example, Xilinx ISE expects "LOC" instead of "pin_assign".

Your synthesis tool may have a totally different way of specifying pin numbers, instead of using HDL attributes.
 

    grittinjames

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