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- Status.TS tied high to indicate absence of an MMU

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- Removed possibility of writng read-only status bits
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git-svn-id: http://moon:8086/svn/vhdl/trunk@481 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-08-08 12:37:43 +00:00
parent 874ed6f824
commit 331590cc36
1 changed files with 10 additions and 3 deletions
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lib/CPUs/MIPS/src/core/mips_cop.vhd
+10 -3
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@@ -464,7 +464,7 @@ cop_status_reg_write:
begin
if rising_edge(clk) then
if rst = '1' then
status <= X"00400000";
status <= X"00600000";
else
if status_save = '1' then
status(5 downto 4) <= status(3 downto 2);
@@ -476,9 +476,16 @@ cop_status_reg_write:
elsif ctrl_in.sdu.WB_nop = '0' then
if stat_reg_we = '1' then
if status(1) = '0' then
status(7 downto 0) <= din(7 downto 0);
status(0) <= din(0); -- IEc
status(1) <= din(1); -- KUc
status(2) <= din(2); -- IEp
status(3) <= din(3); -- KUp
status(4) <= din(4); -- IEo
status(5) <= din(5); -- KUo
end if;
status(31 downto 8) <= din(31 downto 8);
status(15 downto 8) <= din(15 downto 8); -- IM
status(22) <= din(22); -- BEV
status(25) <= din(25); -- RE
end if;
end if;
end if;