Initial import

git-svn-id: http://moon:8086/svn/vhdl/trunk@2 cc03376c-175c-47c8-b038-4cd826a8556b
2008-08-23 07:19:47 +00:00
parent 6badec2df7
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+-------------------------------------------------------------------------
+-- Project: JCPU, a portable 8-bit RISC CPU written in VHDL
+-- This file: The ROM file for use in your VHDL design
+--
+-- 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 <http://www.gnu.org/licenses/>.
+--
+-- 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 work;
+use work.cpu_pkg.all;
+
+-- JASM_ROM_INSERT_HERE
+ENTITY irom IS
+	Port (
+	clk			: in  STD_LOGIC;
+	ce			: in  STD_LOGIC;
+	addr		: in  inst_addr_t;
+	dout		: out inst_t
+	);
+END irom;
+
+ARCHITECTURE reti_issue OF irom IS 
+
+	type imem_rom_t is array (0 to 27) of inst_t;
+
+	-- Assembled from reti_issue.jsm
+	constant imem_rom : imem_rom_t :=
+	(
+		"110000" & X"002", -- 0x000: JMP 0x002
+		"111111" & X"000", -- 0x001: RETI
+		"000011" & X"050", -- 0x002: MOV R00, 0x05
+		"100110" & X"030", -- 0x003: COUT (0x03), R00
+		"000011" & X"000", -- 0x004: MOV R00, 0x00
+		"000000" & X"000", -- 0x005: NOP
+		"010001" & X"010", -- 0x006: INC R00
+		"000000" & X"000", -- 0x007: NOP
+		"111011" & X"01B", -- 0x008: CALL 0x01B
+		"000000" & X"000", -- 0x009: NOP
+		"111100" & X"003", -- 0x00A: PUSH R03
+		"000000" & X"000", -- 0x00B: NOP
+		"111100" & X"002", -- 0x00C: PUSH R02
+		"000000" & X"000", -- 0x00D: NOP
+		"111100" & X"001", -- 0x00E: PUSH R01
+		"000000" & X"000", -- 0x00F: NOP
+		"111100" & X"000", -- 0x010: PUSH R00
+		"000000" & X"000", -- 0x011: NOP
+		"111101" & X"000", -- 0x012: POP R00
+		"000000" & X"000", -- 0x013: NOP
+		"111101" & X"001", -- 0x014: POP R01
+		"000000" & X"000", -- 0x015: NOP
+		"111101" & X"002", -- 0x016: POP R02
+		"000000" & X"000", -- 0x017: NOP
+		"111101" & X"003", -- 0x018: POP R03
+		"000000" & X"000", -- 0x019: NOP
+		"110000" & X"005", -- 0x01A: JMP 0x005
+		"111110" & X"000"  -- 0x01B: RET
+	);
+
+begin
+
+PROM_READ:
+	process(clk, ce)
+	begin
+		if rising_edge(clk) and ce = '1' then
+			dout <= imem_rom(to_integer(addr));
+		end if;
+	end process;
+
+end reti_issue;
+