while simulating DFLIP-FLOP( created by nghdl feature of esim using VHDL code) it is not showing output as compared to standard truth-table of D'Flip-FLop(see image below),please help me to solve this problem ASAP. i am also adding my VHDL code of d-flip-flop here..........
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ library ieee; use ieee.std_logic_1164.all; entity dff is port (data : in std_logic; clk : in std_logic; reset : in std_logic; q : out std_logic); end dff; architecture Behavioral of dff is begin process (clk) begin if (reset = '1') then q <= '0'; elsif (rising_edge(clk)) then q <= data; end if; end process; end Behavioral;
Damm even I am having a similar kind of issue, I have searched all over the internet and even have posted on number of threads on different forum, no solution seems to work. I am really frustrated, can anyone of you here help me resolve this issue, I am very much tired now. get-vidmate.com instasave
I think I need to use the small signal analysis in ngspice, though I'm really only interested in the voltage and/or current phasors. Is that even possible with ngspice? Perhaps a bit more concrete:
- Can ngspice do what I'm trying to do?
- If it can, where can I find examples of analysis of such a circuit with ngspice? I'd prefer to use barebones ngspice without a GUI on top of it.
- Lastly, are there any circuit analysis books that use/teach ngspice alongside their regular content?