how to translate addressing from Verilog to VHDL

[mateushh]

The Verilog code looks like that:




// Create an "enable" signal for our LED logic that selects the
//address within the GBA cartridge address space for our LED
//register. Here we have chosen 0xffe200. Take this value, multiply
//by 2 and add 0x8000000 to get the actual address used by the
//GBA software (0x9ffc400).
assign LEDEn = Addr[23:8]==16'hffe2;




The comments above explain what it is.

When I used the X-HDL translator, the output code looked like that:




LEDEn <= to_bit(Addr(23 DOWNTO 8) = "1111111111100010") ;





And the Xilinx ISE displayed an error:

ERROR:HDLParsers:3312 - c:/xilinx/moje_projekty/redgreenvhdl/../../../!!proba/proba3/RedGreen1.vhd Line 117. Undefined symbol 'to_bit'.


Have you got any ideas??

 

[javad]

The to_bit function Converts a std_ulogic or std_logic value to the built-in VHDL bit type.
It is included in The std_logic_1164 library.
Make sure that this library is defined in your code.
Note that it is better to use all signals in your design with std_logic type. If you do this, there is no need to use such conversion function.