ALTFP_MULT and ALTFP_ADD_SUB issues

Hi there,

When I simulate the ALTFP_MULT and ALTFP_ADD_SUB megafunctions in modelsim (directly from my testbench, not through my main design) I get zero results from both. Has anyone else encountered this, or perhaps have any ideas why this might be happening?

I'm using this code to simulate them:

--- Quote Start ---

FIRadd addtest(

add_rst,

add_en,

CLOCK_50,

dataa,

datab,

add_result

);

initial

begin

add_rst = 1'b1;

add_en = 1'b0;

dataa = 32'h00000000;

datab = 32'h00000000;

# 50ns;

add_rst = 1'b0;

add_en = 1'b1;

dataa = 32'h0000000F;

datab = 32'h0000F001;

end

--- Quote End ---