VHDL Variable Vs. Signal - Stack Overflow
Mar 19, 2013 · With the VHDL-2000/2002 update, shared variables are not permitted to be used with regular types. Instead they may only be used with protected types. Protected types do not …
what exactly is a variable in VHDL? - Stack Overflow
Dec 5, 2014 · I know how to use variables in VHDL and what I can do with that, but I don't know exactly what it is in hardware ? What is the difference between signals and variables in …
VHDL: variable and process - Stack Overflow
Jan 29, 2013 · Process(clk) Variable Q : std_logic_vector(7 downto 0); begin if rising_edge(clk) then if En = '0' then Q := D; end if; end if; Output <= Q; end process; In every clock cycle, if the …
vhdl - Assigning a signal to variable and a variable to a signal ...
May 20, 2016 · 5 I am new to VHDL and after I read through a lot of tutorials, I am now getting my feet wet. Here is a code example which troubles me. The trade_cell entity gets in a signed …
Assigning initial value to VHDL vector - Stack Overflow
Feb 21, 2020 · As user1155120 says, in VHDL the width of the right hand side has to match the width of the left hand side of an assignment operator (<= or :=). So, you could use the literal …
padding out std_logic_vector with leading zeros - Stack Overflow
Mar 18, 2015 · ok, what I would like to do is assign a smaller std_vector to a large one, padding out the upper bits with zeros. But, I want something generic and simple that doesn't involve …
What' s the difference between <= and := in VHDL
Aug 13, 2012 · Currently, I am learning some FPGA design techniques using VHDL, my problem is whether we can use := and <= interchangeably in VHDL or not, though I've seen the use …
VHDL- use of variables - Stack Overflow
Jun 18, 2014 · Use only IEEE.numeric_std and not ieee.std_logic_unsigned, since ieee.std_logic_unsigned is not a VHDL IEEE standard package. The variable n_times should …
VHDL and using the 'report' Statement - Stack Overflow
Sep 28, 2012 · VHDL is also used as a meta-language for describing a hardware architecture, known as RTL. This description is translated into a list of primitives supported by your …
vhdl - shift a std_logic_vector of n bit to right or left - Stack Overflow
Jan 26, 2012 · Use the ieee.numeric_std library, and the appropriate vector type for the numbers you are working on (unsigned or signed). Then the operators are `sla`/`sra` for arithmetic shifts …