Is fixed point (ieee_proposed.fixed_pkg_c) supported by XST

[allsey87]

Hi All,

I'm interested to know if anyone has successfully synthesised code
using the fixed point data types 'sfixed' and 'ufixed' from the
package (ieee_proposed.fixed_pkg_c) without any modifications...

the library declarations in the top of my VHDL source are:
library ieee;
use ieee.std_logic_1164.all;
library ieee_proposed;
use ieee_proposed.fixed_pkg.all;

This seems okay for the ISE simulator (ISim) however when I try to
synthesise my code using XST I get the error:

ERROR:HDLParsers:3317 - "D:/Workspace/LocalisationCore/
goertzel_dsp_core.vhd" Line 3. Library ieee_proposed cannot be found.
ERROR:HDLParsers:3013 - "D:/Workspace/LocalisationCore/
goertzel_dsp_core.vhd" Line 4. Library ieee_proposed is not declared.

Have I not declared something correctly, do I need to tell XST where
its own libraries are?

I know there are several compatibility packages around which attempt
to make some of the features in VHDL2008, 1993 compliant. (http://
www.vhdl.org/fphdl/). But it seems that the 'fixed_pkg_c.vhd ' library/
package file is already in my VHDL source tree under IEEE proposed...

So I guess my question is, what state are libraries that ship with ISE
Design Suite 12.4 in, with regards to VHDL2008 support, and what is
the best solution if I want/need to use the fixed point types ufixed
and sfixed in synthesisable VHDL...

 

[RCIngham]

A related question:
From same site as previous post, I downloaded the packages for ise 11.1 a
=
I wanted modelsim to use the same fixed point arithmetic as ISE eventuall
=
would use for synthesis and implementation. Now, ISE is at version 13 an
I=
wonder if anything has improved regarding fixed point arithmetic sinc
11.=
1. Division was commented out as 11.1 obviously had problems. I can't us
I=
SIM as my code make it barf at me, and modelsim is not allowed t
distribut=
e the said ieee libraries, so I have to do it myself anyway.

--=20
Svenn

You are more likely to get a response if you ask the question at the Xilin
forums, e.g.: http://forums.xilinx.com/t5/Synthesis/bd-p/SYNTHBD


---------------------------------------
Posted through http://www.FPGARelated.com