Guys, sometimes I feel I have to give up... Is so hard to work with ISE. Recently I just have written a simple barrel shifter. Code:
entity bshifter is
Port ( CLR : in STD_LOGIC;
DIN : in STD_LOGIC_VECTOR (2 downto 0);
O : out STD_LOGIC_VECTOR (2 downto 0);
C : in STD_LOGIC);
end bshifter;
architecture Behavioral of bshifter is
signal BSH : std_logic_vector(2 downto 0);
begin
process (C, CLR, DIN)
begin
if CLR = '1' then
BSH <= DIN;
elsif rising_edge(C) then
BSH(1) <= BSH(0);
BSH(2) <= BSH(1);
BSH(0) <= BSH(2);
end if;
end process;
O <= BSH;
end Behavioral;
The result is this:
Of course it does not work.
I just have put the same code into Quartus (Altera) and got this result:
And of course this works perfectly. I simply don't understand how this horrible bug can be found in a such software??? ISE in general has many-many bugs, this is why I started to deal with Altera chips, perhaps their dev stuffs works well. I think this is a serious shame for the ISE developers.
now thats not good!
i had a look with ISE 8.1 (version after "the change") it gave somthing like your schematic.
i tried ISE 6.3 and got a DIFFERENT result.
i would post the images, but this forum want a URL to insert the image (save xilinx server space i guess) the truth is i cant be bothered to post the image elsewhere and link to it from here!
I'd like to thank you for posting this I wasnt aware of it :smileysad:
Bobster_the_lobster
This is a nightmare. I tried to create a schematic, this one:
But because ISE has a serious bug not detecting any SCH change, I had to make a new empty project, copy all VHDL, SCH and UCF files, then I could apply the sch. Mapped the sch into VHDL, then checked the output. This is the result:
Have a see how O0-O2 behave at CLR assertion... and later. The clock is C. There is simply no any relation to the circuit, though in the RTL it showed correctly. I'm gonna retire now, I'm too old for such kind of idiotism.Every day I check for software update, but nothing happened, is possible that Xilinx is going to bankrupt, they run out of resources (developers I mean)??? Now this is what I have to think (world wide economy crash, etc.)
