This example shows how to convert a hexadecimal value to a std_logic_vector. It is shown in both VHDL '87 (IEEE Std 1076-1987) and VHDL '93 (IEEE Std 1076-1993). For more information on using this example in your project, go to: • • MAX+PLUS ® II Help hex.vhd LIBRARY ieee; USE ieee.std_logic_1164.ALL; USE ieee.std_logic_arith.ALL; ENTITY hex IS PORT( D: OUT STD_LOGIC_VECTOR(7 DOWNTO 0)); END hex; ARCHITECTURE a OF hex IS BEGIN -- The following line will convert the hex value -- to a STD_LOGIC_VECTOR in VHDL '87. D(7 DOWNTO 0).

About the std_logic and std_ulogic Data Types; Getting a Hex Editor; Using A Hex Editor; Creating a Binary Data File; Using the Data File in VHDL; References. Though I have not tried, I suspect that if the text file contained std_logic values such as 'Z', 'X', or 'U', the conversion from text to integer would have failed. Package body txt_util is. -- prints text to the screen. Procedure print(text: string) is. Variable msg_line: line. --synopsys translate off. Write(msg_line, text). If intfunction str. -- convert integer to string, using base 10. Function str(int: integer) return.

Function to_bcd ( bin: std_logic_vector ( 7 downto 0 ) ) return std_logic_vector is variable i: integer:= 0; variable bcd: std_logic_vector ( 11 downto 0 ):= ( others =>' 0' ); variable bint: std_logic_vector ( 7 downto 0 ):= bin; begin for i in 0 to 7 loop -- repeating 8 times. Bcd ( 11 downto 1 ):= bcd ( 10 downto 0 ); --shifting the bits. Bcd ( 0 ):= bint ( 7 ); bint ( 7 downto 1 ):= bint ( 6 downto 0 ); bint ( 0 ):=' 0'; if (i '0100' ) then --add 3 if BCD digit is greater than 4. Bcd ( 3 downto 0 ):= bcd ( 3 downto 0 ) + '0011'; end if; if (i '0100' ) then --add 3 if BCD digit is greater than 4. Bcd ( 7 downto 4 ):= bcd ( 7 downto 4 ) + '0011'; end if; if (i '0100' ) then --add 3 if BCD digit is greater than 4. Bcd ( 11 downto 8 ):= bcd ( 11 downto 8 ) + '0011'; end if; end loop; return bcd; end to_bcd; Some sample inputs and the corresponding outputs are shown below: bin = '01100011', output = '0000 1001 1001' (99).

Bin = '11111110', output = '0010 0101 0100' (254). Carry Map 3 4 Crack. Bin = '10111011', output = '0001 1000 0111' (187). Ash Maurya Running Lean Pdf Viewer.

The code is synthesisable, and the cell usage statistics for Virtex-5 FPGA is shown below: # BELS: 24 # GND: 1 # LUT3: 1 # LUT4: 2 # LUT5: 12 # LUT6: 7 # MUXF7: 1 # IO Buffers: 20 # IBUF: 8 # OBUF: 12 Note:- The code can be modified to convert any length binary number to BCD digits.This require very little change in the code. Function to_bcd ( bin: std_logic_vector((n-1) downto 0) ) return std_logic_vector is variable i: integer:=0; variable j: integer:=1; variable bcd: std_logic_vector(((4*q)-1) downto 0):= (others =>'0'); variable bint: std_logic_vector((n-1) downto 0):= bin; begin for i in 0 to n-1 loop -- repeating 8 times.