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xc95108 problem

 
 
Ross Marchant
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      03-31-2005
Hi,

I'm using the XC95108 CPLD and Xilinx ISE 7.1i. The problem I am having is
that outputs are inverted and only at 3 volts.

This is my vhdl file:
----------------------------------------------------------------------------
----
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity test is
Port ( In1 : in std_logic;
In2 : in std_logic;
Out1 : out std_logic;
Out2 : out std_logic);
end test;

architecture Behavioral of test is

begin
Out1 <= In1;
Out2 <= In2;
Out3 <= In3;
end Behavioral;


This is my ucf file:
#PACE: Start of Constraints generated by PACE

#PACE: Start of PACE I/O Pin Assignments
NET "In1" LOC = "P24" ;
NET "In2" LOC = "P25" ;
NET "Out1" LOC = "P54" ;
NET "Out2" LOC = "P55" ;

#PACE: Start of PACE Area Constraints

#PACE: Start of PACE Prohibit Constraints

#PACE: End of Constraints generated by PACE


Now i find if i put an active low pulse on pins 24 or 25, then I will get
the inverse of the pulse on pins 54 or 55, and only at 3 volts. What could
be wrong!?!?!

--
Regards,
Ross Marchant


 
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Ross Marchant
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      03-31-2005
p.s.

the Out3 <= In3; in the vhdl file isn't actually there...



 
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