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[/] [npigrctrl/] [tags/] [arelease/] [npi_vga_v1_00_b/] [hdl/] [vhdl/] [video_cfg.vhd] - Blame information for rev 3

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1 2 slavek 
----------------------------------------------------------------------
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----                                                              ----
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---- Cfg package                                                  ----
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----                                                              ----
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---- Author(s):                                                   ----
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---- - Slavek Valach, s.valach@dspfpga.com                        ----
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----                                                              ----
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----------------------------------------------------------------------
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----                                                              ----
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---- Copyright (C) 2008 Authors and OPENCORES.ORG                 ----
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----                                                              ----
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---- This source file may be used and distributed without         ----
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---- restriction provided that this copyright statement is not    ----
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---- removed from the file and that any derivative work contains  ----
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---- the original copyright notice and the associated disclaimer. ----
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----                                                              ----
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---- This source file is free software; you can redistribute it   ----
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---- and/or modify it under the terms of the GNU General          ----
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---- Public License as published by the Free Software Foundation; ----
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---- either version 2.0 of the License, or (at your option) any   ----
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---- later version.                                               ----
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----                                                              ----
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---- This source is distributed in the hope that it will be       ----
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---- useful, but WITHOUT ANY WARRANTY; without even the implied   ----
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---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ----
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---- PURPOSE. See the GNU General Public License for more details.----
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----                                                              ----
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---- You should have received a copy of the GNU General           ----
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---- Public License along with this source; if not, download it   ----
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---- from http://www.gnu.org/licenses/gpl.txt                     ----
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----                                                              ----
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----------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_arith.all;
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package video_cfg is
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type video_params_t is record
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   x_size         : natural;
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   y_size         : natural;
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   pixel_depth    : natural;
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   h_back_porch   : natural;
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   h_front_porch  : natural;
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   h_sync_width   : natural;
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   h_sync_pol     : std_logic;
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   v_back_porch   : natural;
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   v_front_porch  : natural;
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   v_sync_width   : natural;
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   v_sync_pol     : std_logic;
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end record;
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function log2(x : natural) return integer;
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function get_NPI_Size(constant C_NPI_DATA_WIDTH : natural; constant C_NPI_BURST_SIZE : natural) return std_logic_vector;
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end video_cfg;
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package body video_cfg is
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function log2(x : natural) return integer is
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   variable i  : integer := 0;
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begin
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   if x = 0 then
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      return 0;
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   else
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      while 2**i < x loop
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         i := i+1;
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      end loop;
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      return i;
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   end if;
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end function log2;
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function get_NPI_Size(constant C_NPI_DATA_WIDTH : natural; constant C_NPI_BURST_SIZE : natural) return std_logic_vector is
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BEGIN
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   Case C_NPI_BURST_SIZE is
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      When 4 =>
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         If C_NPI_DATA_WIDTH = 64 Then
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         ASSERT FALSE
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            REPORT "4 byte NPI Burst size is not supported for 64bit interface!"
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            SEVERITY ERROR;
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            return x"F";
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         Else
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            return x"0";
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         End If;
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      When 8 =>
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         If C_NPI_DATA_WIDTH = 64 Then
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            return x"0";
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         Else
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            REPORT "8 byte NPI Burst size is not supported for 32bit interface!"
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            SEVERITY ERROR;
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            return x"F";
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         End If;
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      When 16 =>
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         If C_NPI_DATA_WIDTH = 64 Then
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            return x"1";
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         Else
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            return x"1";
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         End If;
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      When 32 =>
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         If C_NPI_DATA_WIDTH = 64 Then
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            return x"2";
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         Else
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            return x"2";
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         End If;
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      When 64 =>
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         If C_NPI_DATA_WIDTH = 64 Then
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            return x"3";
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         Else
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            return x"3";
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         End If;
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      When 128 =>
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         If C_NPI_DATA_WIDTH = 64 Then
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            return x"4";
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         Else
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            return x"4";
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         End If;
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      When 256 =>
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         If C_NPI_DATA_WIDTH = 64 Then
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            return x"5";
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         Else
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            ASSERT FALSE
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               REPORT "NPI Burst size is not supported!"
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               SEVERITY ERROR;
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            return x"F";
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         End If;
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      When Others =>
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         ASSERT FALSE
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            REPORT "NPI Burst size is not supported!"
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            SEVERITY ERROR;
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         return x"F";
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   End Case;
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END FUNCTION get_NPI_Size;
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end video_cfg;

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