------------------------------------------------------------------------- -- Project: JCPU, a portable 8-bit RISC CPU written in VHDL -- This file: loadable ROM -- -- Copyright (C) 2007 J. Ahrensfeld -- -- This program is free software: you can redistribute it and/or modify -- it under the terms of the GNU General Public License as published by -- the Free Software Foundation, either version 3 of the License, or -- (at your option) any later version. -- -- This program is distributed in the hope that it will be useful, -- but WITHOUT ANY WARRANTY; without even the implied warranty of -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -- GNU General Public License for more details. -- -- You should have received a copy of the GNU General Public License -- along with this program. If not, see . -- -- For questions and ideas, please contact the author at jens@jayfield.org -- -------------------------------------------------------------------------- LIBRARY ieee; use IEEE.STD_LOGIC_1164.ALL; USE ieee.numeric_std.ALL; library UNISIM; use UNISIM.VComponents.all; library work; use work.cpu_pkg.all; ENTITY irom IS Port ( clk : in STD_LOGIC; ce : in STD_LOGIC; addr : in inst_addr_t; dout : out inst_t ); END irom; ARCHITECTURE loadable OF irom IS -- JASM_ROM_INSERT_HERE -- Assembled from dctest.jsm type imem_rom_t is array (0 to 1023) of inst_t; signal imem_rom : imem_rom_t := ( "110000" & X"010", -- 0x000: JMP 0x010 "110000" & X"011", -- 0x001: JMP 0x011 "000000" & X"000", -- 0x002: "000000" & X"000", -- 0x003: "000000" & X"000", -- 0x004: "000000" & X"000", -- 0x005: "000000" & X"000", -- 0x006: "000000" & X"000", -- 0x007: "000000" & X"000", -- 0x008: "000000" & X"000", -- 0x009: "000000" & X"000", -- 0x00A: "000000" & X"000", -- 0x00B: "000000" & X"000", -- 0x00C: "000000" & X"000", -- 0x00D: "000000" & X"000", -- 0x00E: "000000" & X"000", -- 0x00F: "110000" & X"010", -- 0x010: JMP 0x010 "111111" & X"000", -- 0x011: RETI "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", 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"000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000", "000000" & X"000" ); signal jtag_ld_clk : STD_LOGIC; signal jtag_ld_we : STD_LOGIC; signal jtag_ld_addr : inst_addr_t; signal jtag_ld_dout : inst_t; signal jtag_ld_din : inst_t; signal bs_rst, bs_sel, bs_shift, bs_tdi, bs_tdo : std_logic; signal bs_capture, bs_clk0, bs_clk1, bs_update0, bs_update1 : std_logic; signal user_regi, user_rego : unsigned (31 downto 0); constant id : unsigned (31 downto 0) := X"BABE" & X"BEEF"; begin -------------------------------------------------------------------------- -- Virtex-4: JTAG Loader -------------------------------------------------------------------------- i00_BUFG : BUFG port map ( O => bs_clk1, I => bs_clk0 ); i01_BUFG : BUFG port map ( O => bs_update1, I => bs_update0 ); BSCAN_VIRTEX4_inst1 : BSCAN_VIRTEX4 generic map ( JTAG_CHAIN => 1 -- Value to set BSCAN site of device. Possible values: (1,2,3 or 4) ) port map ( CAPTURE => bs_capture, -- CAPTURE output from TAP controller DRCK => bs_clk0, -- Data register output for USER functions RESET => bs_rst, -- Reset output from TAP controller SEL => bs_sel, -- USER active output SHIFT => bs_shift, -- SHIFT output from TAP controller TDI => bs_tdi, -- TDI output from TAP controller UPDATE => bs_update0, -- UPDATE output from TAP controller TDO => bs_tdo -- Data input for USER function ); jtag_ld_addr <= user_regi(user_regi'left downto user_regi'left-inst_addr_t'length+1); jtag_ld_din <= user_regi(inst_t'length-1 downto 0); jtag_ld_clk <= bs_update1; jtag_ld_we <= bs_sel; sipo: process (bs_rst, bs_clk1, bs_tdi, bs_shift) begin if bs_rst = '1' then user_regi <= (others => '0'); elsif rising_edge(bs_clk1) then if bs_shift = '1' then user_regi <= bs_tdi & user_regi(user_regi'left downto 1); end if; end if; end process; piso: process (bs_rst, bs_clk1, bs_shift, user_rego) begin bs_tdo <= user_rego(0); if bs_rst = '1' then user_rego <= (others => '0'); elsif rising_edge(bs_clk1) then if bs_shift = '1' then user_rego <= user_rego(0) & user_rego(user_rego'left downto 1); else user_rego <= (user_rego'left downto inst_t'length => '0') & jtag_ld_dout; -- user_rego <= id; end if; end if; end process; -------------------------------------------------------------------------- -- ROM Read/Write -------------------------------------------------------------------------- PROM_READ: process(clk, ce) begin if rising_edge(clk) and ce = '1' then dout <= imem_rom(to_integer(addr)); end if; end process; PROM_WRITE: process(jtag_ld_clk, jtag_ld_we) begin if rising_edge(jtag_ld_clk) then if jtag_ld_we = '1' then imem_rom(to_integer(jtag_ld_addr)) <= jtag_ld_din; else jtag_ld_dout <= imem_rom(to_integer(jtag_ld_addr)); end if; end if; end process; -------------------------------------------------------------------------- end loadable;