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- status register is always writable

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git-svn-id: http://moon:8086/svn/vhdl/trunk@457 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-04-19 17:57:33 +00:00
parent d97c9dd6ec
commit 20dc046c75
1 changed files with 7 additions and 6 deletions
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lib/CPUs/MIPS/src/core/mips_cop.vhd
+7 -6
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@@ -68,6 +68,7 @@ architecture Behavioral of cop is
signal code_reg_we : STD_LOGIC; signal code_reg_we : STD_LOGIC;
signal ip_reg_we : STD_LOGIC; signal ip_reg_we : STD_LOGIC;
signal bd : STD_LOGIC; signal bd : STD_LOGIC;
signal sw_int : unsigned(1 downto 0);
signal ip : unsigned(7 downto 0); signal ip : unsigned(7 downto 0);
signal im : unsigned(7 downto 0); signal im : unsigned(7 downto 0);
signal status_save : STD_LOGIC; signal status_save : STD_LOGIC;
@@ -330,13 +331,13 @@ cop_ip_reg_write:
begin begin
if rising_edge(clk) then if rising_edge(clk) then
if rst = '1' then if rst = '1' then
ip(1 downto 0) <= (others => '0'); sw_int <= (others => '0');
elsif ctrl_in.sdu.WB_nop = '0' then elsif ctrl_in.sdu.WB_nop = '0' then
if ip_reg_we = '1' then if ip_reg_we = '1' then
ip(1 downto 0) <= din(9 downto 8) and im(1 downto 0); sw_int <= din(9 downto 8);
end if; end if;
end if; end if;
ip(7 downto 2) <= int and im(7 downto 2); ip <= (int & sw_int) and im;
end if; end if;
end process; end process;
@@ -420,9 +421,9 @@ cop_we_gen:
case cop_pipe_EX.reg_ptr is case cop_pipe_EX.reg_ptr is
when "01100" => when "01100" =>
stat_reg_we <= not status(1) or status(28); stat_reg_we <= '1'; -- not status(1) or status(28);
when "01101" => when "01101" =>
ip_reg_we <= not status(1) or status(28); ip_reg_we <= '1'; -- not status(1) or status(28);
when "11111" => when "11111" =>
test_reg_we <= '1'; -- not status(1) or status(28); test_reg_we <= '1'; -- not status(1) or status(28);
when others => null; when others => null;
@@ -464,7 +465,7 @@ cop_status_reg_write:
status(3 downto 2) <= status(5 downto 4); status(3 downto 2) <= status(5 downto 4);
elsif ctrl_in.sdu.WB_nop = '0' then elsif ctrl_in.sdu.WB_nop = '0' then
if stat_reg_we = '1' then if stat_reg_we = '1' then
status <= din; status <= din;
end if; end if;
end if; end if;
end if; end if;