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[/] [potato/] [trunk/] [src/] [pp_alu_control_unit.vhd] - Diff between revs 3 and 14
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| Rev 3 |
Rev 14 |
| Line 87... |
Line 87... |
when b"110" =>
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when b"110" =>
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alu_op <= ALU_OR;
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alu_op <= ALU_OR;
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when b"111" =>
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when b"111" =>
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alu_op <= ALU_AND;
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alu_op <= ALU_AND;
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when others =>
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when others =>
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alu_op <= ALU_NOP;
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alu_op <= ALU_INVALID;
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end case;
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end case;
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when b"01100" => -- Register-register operations
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when b"01100" => -- Register-register operations
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alu_x_src <= ALU_SRC_REG;
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alu_x_src <= ALU_SRC_REG;
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alu_y_src <= ALU_SRC_REG;
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alu_y_src <= ALU_SRC_REG;
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| Line 119... |
Line 119... |
when b"110" =>
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when b"110" =>
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alu_op <= ALU_OR;
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alu_op <= ALU_OR;
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when b"111" =>
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when b"111" =>
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alu_op <= ALU_AND;
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alu_op <= ALU_AND;
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when others =>
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when others =>
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alu_op <= ALU_NOP;
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alu_op <= ALU_INVALID;
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end case;
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end case;
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when b"00011" => -- Fence instructions, ignored
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alu_x_src <= ALU_SRC_REG;
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alu_y_src <= ALU_SRC_REG;
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alu_op <= ALU_NOP;
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when b"11100" => -- System instructions
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when b"11100" => -- System instructions
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alu_x_src <= ALU_SRC_CSR;
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alu_x_src <= ALU_SRC_CSR;
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alu_y_src <= ALU_SRC_NULL;
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alu_y_src <= ALU_SRC_NULL;
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alu_op <= ALU_ADD;
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alu_op <= ALU_ADD;
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when others =>
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when others =>
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alu_x_src <= ALU_SRC_REG;
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alu_x_src <= ALU_SRC_REG;
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alu_y_src <= ALU_SRC_REG;
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alu_y_src <= ALU_SRC_REG;
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alu_op <= ALU_NOP;
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alu_op <= ALU_INVALID;
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end case;
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end case;
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end process decode_alu;
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end process decode_alu;
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end architecture behaviour;
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end architecture behaviour;
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