diff options
| author | Bobby Bingham <koorogi@koorogi.info> | 2017-01-08 23:35:53 -0600 |
|---|---|---|
| committer | Bobby Bingham <koorogi@koorogi.info> | 2017-01-08 23:35:53 -0600 |
| commit | ad9b6505e537155f76afaecf8f3068e1de63e569 (patch) | |
| tree | 77cc941645740712021e6741b8148fed1f8a89ee /alu_stage.v | |
| parent | f2b72883df7f67c53f7157193ec7271943a1654e (diff) | |
This was only used by the notneg instruction, which no longer needs it
after having been reimplemented in terms of subtraction.
Diffstat (limited to 'alu_stage.v')
| -rw-r--r-- | alu_stage.v | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/alu_stage.v b/alu_stage.v index 92c8246..618cc89 100644 --- a/alu_stage.v +++ b/alu_stage.v @@ -58,7 +58,7 @@ module alu_stage ( .aluReg1(aluReg1_in), .aluReg2(aluReg2_in), .aluOpSource1(aluOpSource1_in), // ALU first operand: 0 = reg, 1 = memory read, 2 = imm8, 3 = PC - .aluOpSource2(aluOpSource2_in), // ALU second operand: 0 = reg, 1 = ~reg, 2 = PC, 3 = ??? + .aluOpSource2(aluOpSource2_in), // ALU second operand: 0 = reg, 1 = ???, 2 = PC, 3 = ??? .aluDest(aluDest_in), // 0 = reg, 1 = PC .aluCarrySource(aluCarrySource), // ALU carry input source: 0 = zero, 1 = one, 2 = carry flag, 3 = inverted carry flag @@ -83,8 +83,7 @@ module alu_stage ( wire [15:0] aluSrc2; assign aluSrc2 = - aluOpSource1_in == 2'h0 ? rf_dataB : - aluOpSource1_in == 2'h1 ? ~rf_dataIn : pc_in; + aluOpSource1_in == 2'h0 ? rf_dataB : pc_in; assign aluCarry_in = aluCarrySource[0] ^ (aluCarrySource[1] & statusReg[0]); |