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----------------------------------------------------------------------------
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-- This file is a part of the GRLIB VHDL IP LIBRARY
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-- Copyright (C) 2004 GAISLER RESEARCH
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 2 of the License, or
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-- (at your option) any later version.
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--
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-- See the file COPYING for the full details of the license.
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--
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-----------------------------------------------------------------------------
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-- Entity: ahbrom
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-- File: ahbrom.vhd
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-- Author: Jiri Gaisler - Gaisler Research
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-- Description: AHB rom. 0/1-waitstate read
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------------------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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library grlib;
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use grlib.amba.all;
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use grlib.stdlib.all;
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use grlib.devices.all;
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entity ahbrom is
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generic (
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hindex : integer := 0;
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haddr : integer := 0;
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hmask : integer := 16#fff#;
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pipe : integer := 0;
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tech : integer := 0;
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kbytes : integer := 1);
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port (
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rst : in std_ulogic;
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clk : in std_ulogic;
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ahbsi : in ahb_slv_in_type;
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ahbso : out ahb_slv_out_type
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);
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end;
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architecture rtl of ahbrom is
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constant abits : integer := 9;
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constant bytes : integer := 288;
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constant hconfig : ahb_config_type := (
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0 => ahb_device_reg ( VENDOR_GAISLER, GAISLER_AHBROM, 0, 0, 0),
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4 => ahb_membar(haddr, '1', '1', hmask), others => zero32);
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signal romdata : std_logic_vector(31 downto 0);
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signal addr : std_logic_vector(abits-1 downto 2);
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signal hsel, hready : std_ulogic;
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begin
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ahbso.hresp <= "00";
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ahbso.hsplit <= (others => '0');
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ahbso.hirq <= (others => '0');
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ahbso.hcache <= '1';
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ahbso.hconfig <= hconfig;
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ahbso.hindex <= hindex;
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reg : process (clk)
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begin
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if rising_edge(clk) then
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addr <= ahbsi.haddr(abits-1 downto 2);
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end if;
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end process;
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p0 : if pipe = 0 generate
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ahbso.hrdata <= ahbdrivedata(romdata);
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ahbso.hready <= '1';
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end generate;
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p1 : if pipe = 1 generate
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reg2 : process (clk)
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begin
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if rising_edge(clk) then
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hsel <= ahbsi.hsel(hindex) and ahbsi.htrans(1);
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hready <= ahbsi.hready;
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ahbso.hready <= (not rst) or (hsel and hready) or
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(ahbsi.hsel(hindex) and not ahbsi.htrans(1) and ahbsi.hready);
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ahbso.hrdata <= ahbdrivedata(romdata);
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end if;
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end process;
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end generate;
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comb : process (addr)
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begin
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case conv_integer(addr) is
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when 16#00000# => romdata <= X"81D82000";
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when 16#00001# => romdata <= X"03000004";
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when 16#00002# => romdata <= X"821060C0";
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when 16#00003# => romdata <= X"81884000";
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when 16#00004# => romdata <= X"81900000";
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when 16#00005# => romdata <= X"81980000";
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when 16#00006# => romdata <= X"81800000";
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when 16#00007# => romdata <= X"01000000";
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when 16#00008# => romdata <= X"03000040";
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when 16#00009# => romdata <= X"8210600F";
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when 16#0000A# => romdata <= X"C2A00040";
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when 16#0000B# => romdata <= X"87444000";
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when 16#0000C# => romdata <= X"8608E01F";
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when 16#0000D# => romdata <= X"88100000";
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when 16#0000E# => romdata <= X"8A100000";
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when 16#0000F# => romdata <= X"8C100000";
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when 16#00010# => romdata <= X"8E100000";
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when 16#00011# => romdata <= X"A0100000";
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when 16#00012# => romdata <= X"A2100000";
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when 16#00013# => romdata <= X"A4100000";
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when 16#00014# => romdata <= X"A6100000";
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when 16#00015# => romdata <= X"A8100000";
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when 16#00016# => romdata <= X"AA100000";
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when 16#00017# => romdata <= X"AC100000";
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when 16#00018# => romdata <= X"AE100000";
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when 16#00019# => romdata <= X"90100000";
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when 16#0001A# => romdata <= X"92100000";
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when 16#0001B# => romdata <= X"94100000";
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when 16#0001C# => romdata <= X"96100000";
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when 16#0001D# => romdata <= X"98100000";
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when 16#0001E# => romdata <= X"9A100000";
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when 16#0001F# => romdata <= X"9C100000";
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when 16#00020# => romdata <= X"9E100000";
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when 16#00021# => romdata <= X"86A0E001";
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when 16#00022# => romdata <= X"16BFFFEF";
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when 16#00023# => romdata <= X"81E00000";
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when 16#00024# => romdata <= X"82102002";
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when 16#00025# => romdata <= X"81904000";
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when 16#00026# => romdata <= X"03000004";
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when 16#00027# => romdata <= X"821060E0";
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when 16#00028# => romdata <= X"81884000";
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when 16#00029# => romdata <= X"01000000";
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when 16#0002A# => romdata <= X"01000000";
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when 16#0002B# => romdata <= X"01000000";
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when 16#0002C# => romdata <= X"03200000";
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when 16#0002D# => romdata <= X"84102233";
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when 16#0002E# => romdata <= X"C4204000";
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when 16#0002F# => romdata <= X"0539AE13";
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when 16#00030# => romdata <= X"8410A260";
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when 16#00031# => romdata <= X"C4206004";
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when 16#00032# => romdata <= X"050003FC";
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when 16#00033# => romdata <= X"C4206008";
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when 16#00034# => romdata <= X"3D1003FF";
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when 16#00035# => romdata <= X"BC17A3E0";
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when 16#00036# => romdata <= X"9C27A060";
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when 16#00037# => romdata <= X"03100000";
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when 16#00038# => romdata <= X"81C04000";
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when 16#00039# => romdata <= X"01000000";
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when 16#0003A# => romdata <= X"01000000";
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when 16#0003B# => romdata <= X"01000000";
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when 16#0003C# => romdata <= X"01000000";
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when 16#0003D# => romdata <= X"01000000";
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when 16#0003E# => romdata <= X"01000000";
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when 16#0003F# => romdata <= X"01000000";
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when 16#00040# => romdata <= X"00000004";
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when 16#00041# => romdata <= X"00000000";
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when 16#00042# => romdata <= X"00000004";
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when 16#00043# => romdata <= X"00000000";
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when 16#00044# => romdata <= X"FFFFFFFC";
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when 16#00045# => romdata <= X"00000000";
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when 16#00046# => romdata <= X"FFFFFFFC";
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when 16#00047# => romdata <= X"00000000";
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when 16#00048# => romdata <= X"00000000";
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when others => romdata <= (others => '-');
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end case;
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end process;
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-- pragma translate_off
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bootmsg : report_version
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generic map ("ahbrom" & tost(hindex) &
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": 32-bit AHB ROM Module, " & tost(bytes/4) & " words, " & tost(abits-2) & " address bits" );
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-- pragma translate_on
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end;
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