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aikaoladexuanwei
轩卫
5 年前
trueaikaoladexuanwei

WHEN "0000000000000011" =>
temp_Y <=inputA or inputB;
WHEN "0000000000000100" => --XOR逻辑异或
temp_Y <= inputA XOR InputB;
WHEN "0000000000000101" => --NOT逻辑非
temp_Y <= NOT InputA;
WHEN "0000000000000110" => --逻辑左移
temp_Y <= TO_STDLOGICVECTOR(To_bitvector(InputA) SLL CONV_INTEGER(InputB));
WHEN "0000000000000111" => --逻辑右移
temp_Y <= TO_STDLOGICVECTOR(To_bitvector(InputA) SRL CONV_INTEGER(InputB));
WHEN "0000000000001000" => --算数左移
temp_Y <= TO_STDLOGICVECTOR(To_bitvector(InputA) SLA CONV_INTEGER(InputB));
WHEN "0000000000001001" => --算数右移
temp_Y <=TO_STDLOGICVECTOR(To_bitvector(InputA) SRL CONV_INTEGER(InputB));
WHEN "0000000000001010" =>
temp_Y <=TO_STDLOGICVECTOR(To_bitvector(InputA) ROL CONV_INTEGER(InputB));
WHEN "0000000000001011" =>
temp_Y <=TO_STDLOGICVECTOR(To_bitvector(InputA) ROR CONV_INTEGER(InputB));
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下一条：
WHEN "0000000000000001" => --SUB减 temp_Y <= inputA - inputB; if(inputA(15) = '0' and inputB(15) = '0' and temp_Y(15) = '1') then --进行溢出和是否进位判断 flags<="0000000000000001"; end if; if(inputA(15)='1' and inputB(15)='1' and temp_Y(15)='0') then --进行溢出和是否进位判断 flags<="0000000000000011"; end if; if(temp_Y = "0000000000000000") then --0标志位与0进行比较 flags<= flags or "0000000000000100"; end if; if(temp_Y(15) = '1') then --通过符号位来判断正负标志位 flags<=flags or "0000000000001000"; end if; WHEN "0000000000000010" => --AND逻辑与 temp_Y <= (inputA AND inputB); if(temp_Y = "0000000000000000") then --0标志位与0进行比较 flags<= "0000000000000100"; end if; if(temp_Y(15) = '1') then --通过符号位来判断正负标志位 flags<=flags or "0000000000001000"; end if;