decoding MULT(U)/DIV(U) -> MIPSel1 decoder complete
Stefan Schuermans commited on 2012-02-05 17:32:53
Showing 2 changed files, with 8 additions and 1 deletions.
- mips/decoder.vhd c2c247c..e5c3165
- mips/types.vhd 4ce9c5b..43bf17c
| ... | ... |
@@ -119,7 +119,10 @@ BEGIN |
| 119 | 119 |
WHEN "010001" => o_op <= op_mtlo; |
| 120 | 120 |
WHEN "010010" => o_op <= op_mfhi; |
| 121 | 121 |
WHEN "010011" => o_op <= op_mtlo; |
| 122 |
- -- TODO: 011xxx missing |
|
| 122 |
+ WHEN "011000" => o_op <= op_mult; |
|
| 123 |
+ WHEN "011001" => o_op <= op_multu; |
|
| 124 |
+ WHEN "011010" => o_op <= op_div; |
|
| 125 |
+ WHEN "011011" => o_op <= op_divu; |
|
| 123 | 126 |
WHEN "100000" => o_op <= op_alu; o_alu <= alu_add; |
| 124 | 127 |
WHEN "100001" => o_op <= op_alu; o_alu <= alu_add; |
| 125 | 128 |
WHEN "100010" => o_op <= op_alu; o_alu <= alu_sub; |
| ... | ... |
@@ -8,12 +8,16 @@ PACKAGE mips_types IS |
| 8 | 8 |
TYPE t_op IS ( |
| 9 | 9 |
op_none, |
| 10 | 10 |
op_alu, -- ALU operation |
| 11 |
+ op_div, -- divide |
|
| 12 |
+ op_divu, -- divide unsigned |
|
| 11 | 13 |
op_j, -- jump or branch |
| 12 | 14 |
op_l, -- load |
| 13 | 15 |
op_mfhi, -- move from HI |
| 14 | 16 |
op_mflo, -- move from LO |
| 15 | 17 |
op_mthi, -- move to HI |
| 16 | 18 |
op_mtlo, -- move to LO |
| 19 |
+ op_mult, -- multiply |
|
| 20 |
+ op_multu, -- multiply unsigned |
|
| 17 | 21 |
op_s -- store |
| 18 | 22 |
); |
| 19 | 23 |
|
| 20 | 24 |