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[/] [cpu_lecture/] [trunk/] [src/] [alu.vhd] - Diff between revs 2 and 11
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| Rev 2 |
Rev 11 |
| Line 325... |
Line 325... |
Q_FLAGS(4) <= (L_SBIW_D(15) and not I_D(15))
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Q_FLAGS(4) <= (L_SBIW_D(15) and not I_D(15))
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xor (I_D(15) and not L_SBIW_D(15)); -- Signed
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xor (I_D(15) and not L_SBIW_D(15)); -- Signed
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when ALU_SREG =>
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when ALU_SREG =>
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case I_BIT(2 downto 0) is
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case I_BIT(2 downto 0) is
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when "000" => Q_FLAGS(0) <= I_BIT(3);
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when "000" => Q_FLAGS(0) <= not I_BIT(3);
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when "001" => Q_FLAGS(1) <= I_BIT(3);
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when "001" => Q_FLAGS(1) <= not I_BIT(3);
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when "010" => Q_FLAGS(2) <= I_BIT(3);
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when "010" => Q_FLAGS(2) <= not I_BIT(3);
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when "011" => Q_FLAGS(3) <= I_BIT(3);
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when "011" => Q_FLAGS(3) <= not I_BIT(3);
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when "100" => Q_FLAGS(4) <= I_BIT(3);
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when "100" => Q_FLAGS(4) <= not I_BIT(3);
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when "101" => Q_FLAGS(5) <= I_BIT(3);
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when "101" => Q_FLAGS(5) <= not I_BIT(3);
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when "110" => Q_FLAGS(6) <= I_BIT(3);
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when "110" => Q_FLAGS(6) <= not I_BIT(3);
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when others => Q_FLAGS(7) <= I_BIT(3);
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when others => Q_FLAGS(7) <= not I_BIT(3);
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end case;
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end case;
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when ALU_SUB =>
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when ALU_SUB =>
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L_DOUT <= L_SUB_DR & L_SUB_DR;
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L_DOUT <= L_SUB_DR & L_SUB_DR;
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Q_FLAGS(0) <= cy(L_SUB_DR(7), L_RI8(7), L_D8(7)); -- Carry
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Q_FLAGS(0) <= cy(L_SUB_DR(7), L_RI8(7), L_D8(7)); -- Carry
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