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VHDL (VHSIC (Very High Speed Integrated Circuit) Hardware Description Language) is a hardware description language used in electronic design automation to describe and design digital systems such as field-programmable gate arrays and integrated circuits.

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Error while simulating vhdl code for 4 bit counter in vivado 2015.2

Sir, Whenever i simulate my vhdl code of 4 bit counter in Xilinx vivado 2015.2, i get the error message like following. … ERROR: [VRFC 10-724] found '0' definitions of operator "+", cannot determine exact overloaded matching definition for "+" My vhdl code is library IEEE; use IEEE.STD_LOGIC_1164.ALL; use ieee.numeric_std.all …
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