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vhdl/lib/CPUs/JCpu/src/reti_issue_irom_ld.vhdl
T
jens 335cc4e9d2 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

1182 lines
26 KiB
VHDL
Raw Blame History

-------------------------------------------------------------------------
-- 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 <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 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 reti_issue.jsm
type imem_rom_t is array (0 to 1023) of inst_t;
signal 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
"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",
"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",
"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",
"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",
"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",
"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",
"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",
"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;
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