[SOLVED] Modelsim compile error: t_sfixed function call "not a globally static expression"

[zermelo]

Modelsim compile error: t_sfixed function call "not a globally static expression"

Hi,

I get the following Modelsim error when compiling my design for simulation:

"# ** Error: tx_and_replica.vhd(362): Actual (function call "to_sfixed") for formal "i_x" is not a globally static expression."

The relevant code snippets are:

1) Port mapping: Line 362 is the s_tx_tmr conversion to signed fixed.

U_ITPL_TTL_HIGH: lin_itpl
Generic map
  (G_COORD_DEC => s_step_low_freq'length,
   G_COORD_FR  => 0,
   G_SLOPE_DEC => 1,   -- We need the sign bit, the slope is negative! 
   G_SLOPE_FR  => -s_step_slope'right)
   
Port map 
  (-- Reset & clock/clock en   
   i_rst  => i_rst,                 
   i_clk  => i_clk,
   i_conv => s_tx_cr_p_zc,
   -- Inputs 
   i_slope => s_step_slope,                                             -- decimal value
   i_x     => to_sfixed(std_logic_vector(s_tx_tmr),10,0),    -- integer value   
   i_x1    => to_sfixed(0,10,0),                                        -- integer value
   i_y1    => s_step_low_freq,
   -- Outputs  
   o_data_rdy => s_ttl_data_hi_rdy,
   o_data     => s_ttl_data_hi_fx);

2) s_tx_tmr declaration:

signal s_tx_tmr     : unsigned(10 downto 0);

3) Conflicting component entity:

Library ieee_proposed;
library work;

use ieee.std_logic_1164.all ;
use ieee_proposed.fixed_pkg.all;

Entity lin_itpl is
Generic
  (G_COORD_DEC : natural := 8;   -- Applies to coordinates only
   G_COORD_FR  : natural := 2;   -- Applies to coordinates only 
   G_SLOPE_DEC : natural := 1;   -- Applies to slope only 
   G_SLOPE_FR  : natural := 4);  -- Applies to slope only
Port  
  (-- Reset & clock/clock en   
   i_rst  : in std_logic;                 
   i_clk  : in std_logic;
   i_conv : in std_logic;
   -- Inputs 
   i_slope : in sfixed(G_SLOPE_DEC - 1 downto - G_SLOPE_FR);
   i_x     : in sfixed(G_COORD_DEC - 1 downto - G_COORD_FR);   
   i_x1    : in sfixed(G_COORD_DEC - 1 downto - G_COORD_FR);   
   i_y1    : in sfixed(G_COORD_DEC - 1 downto - G_COORD_FR);   
   -- Outputs  
   o_data_rdy : out std_logic;
   o_data     : out sfixed(G_COORD_DEC + G_SLOPE_DEC+1  downto -G_COORD_FR - G_SLOPE_FR));
    
end lin_itpl;

I had this "globally static" Modelsim error before when using a case with the control signal length defined via generic. Now there are no generics involved in the conflictive type conversion.

What could be causing this?


zermelo

- - - Updated - - -

Hi,

Solved. It looks like Modelsim does not like signal conversion in port mappings.

Thanks

zermelo

 

[zermelo]

Re: Modelsim compile error: t_sfixed function call "not a globally static expression"

Ok . Solved. It looks like Modelsim does not like signal conversion types in port mappings.