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- more decoding of cop_signals.

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New cop_read is now implemented into instruction decoder

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git-svn-id: http://moon:8086/svn/vhdl/trunk@399 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-03-17 09:36:33 +00:00
parent 4bf6b28c71
commit 9cb7ef5930
1 changed files with 14 additions and 1 deletions
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lib/CPUs/MIPS/src/core/mips_instr.vhd
+14 -1
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@@ -157,7 +157,7 @@ package body mips_instr is
rt := to_integer(extract_rt(instr)); rt := to_integer(extract_rt(instr));
rs := to_integer(extract_rs(instr)); rs := to_integer(extract_rs(instr));
result := op_sll; result := reserved;
case opc is case opc is
@@ -485,6 +485,7 @@ package body mips_instr is
variable result : ctrl_lines_t; variable result : ctrl_lines_t;
begin begin
result.cop_instr_en := '0'; result.cop_instr_en := '0';
result.cop_read := '0';
result.jump := '0'; result.jump := '0';
result.jump_long := '0'; result.jump_long := '0';
result.branch := '0'; result.branch := '0';
@@ -794,6 +795,18 @@ package body mips_instr is
-- when COPz => -- when COPz =>
when 16 | 17 | 18 | 19 => when 16 | 17 | 18 | 19 =>
result.cop_instr_en := '1'; result.cop_instr_en := '1';
case rs is
when 0 => -- MFCz
result.cop_read := '1';
result.reg_write := '1';
when 2 => -- CFCz
result.cop_read := '1';
result.reg_write := '1';
when others => null; -- undef
end case;
-- when op_addi => -- when op_addi =>
when 8 => when 8 =>