![]() In this case, XST recognizes that this 9-bit adder can be implemented as an 8-bit adder with Carry Out. One solution, for the example, is to adjust the size of operands A and B to 9-bit using concatenation.The reason is that the size of the result for "+" in this package is equal to the size of the longest argument, that is, 8 bit. For example "std_logic_unsigned" does not allow you to write "+" in the following form to obtain Carry Out: If you use VHDL, then before writing a "+" operation with Carry Out, please examine the arithmetic package you are going to use. This section contains VHDL and Verilog descriptions of an unsigned 8-bit adder with Carry Out. Port(A,B : in std_logic_vector(7 downto 0) įollowing is the Verilog code for an unsigned 8-bit adder with carry in.Įndmodule Unsigned 8-bit Adder with Carry Out ![]() ![]() ![]() Following is the VHDL code for an unsigned 8-bit adder with carry in. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
March 2023
Categories |