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[/] [ion/] [trunk/] [vhdl/] [mips_cpu.vhdl] - Diff between revs 12 and 22
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| Rev 12 |
Rev 22 |
| Line 588... |
Line 588... |
p1_alu_op2_sel_set0 <=
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p1_alu_op2_sel_set0 <=
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"11" when p1_ir_op(31 downto 30)="10" or p1_ir_op(29)='1' else
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"11" when p1_ir_op(31 downto 30)="10" or p1_ir_op(29)='1' else
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"00";
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"00";
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-- ALU input-2 selection: use registers Hi and Lo for MFHI, MFLO
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-- ALU input-2 selection: use registers Hi and Lo for MFHI, MFLO
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with p1_ir_fn select p1_alu_op2_sel_set1 <=
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p1_alu_op2_sel_set1 <=
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"01" when "010000",
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"01" when p1_op_special='1' and (p1_ir_fn="010000" or p1_ir_fn="010010")
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"10" when "010010",
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else "00";
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"00" when others;
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-- ALU input-2 final selection
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-- ALU input-2 final selection
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p1_alu_op2_sel <= p1_alu_op2_sel_set0 or p1_alu_op2_sel_set1;
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p1_alu_op2_sel <= p1_alu_op2_sel_set0 or p1_alu_op2_sel_set1;
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-- Decode store operations
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-- Decode store operations
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