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https://opencores.org/ocsvn/iso7816_3_master/iso7816_3_master/trunk
Subversion Repositories iso7816_3_master
[/] [iso7816_3_master/] [trunk/] [test/] [HexStringConversion.v] - Rev 9
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function [7:0] hexString2Byte; input [15:0] byteInHexString; integer i; reg [7:0] hexDigit; reg [4:0] nibble; begin //hexString2Byte=0; for(i=0;i<2;i=i+1) begin nibble=5'b10000;//invalid hexDigit=byteInHexString[i*8+:8]; if(("0"<=hexDigit)&&("9">=hexDigit)) nibble=hexDigit-"0"; if(("a"<=hexDigit)&&("f">=hexDigit)) nibble=10+hexDigit-"a"; if(("A"<=hexDigit)&&("F">=hexDigit)) nibble=10+hexDigit-"A"; if(nibble>15) begin $display("Invalid input for hex conversion: '%s', hexDigit='%s' (%x), nibble=%d",byteInHexString,hexDigit,hexDigit,nibble); $finish; end hexString2Byte[i*4+:4]=nibble; end end endfunction
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