有没有3.3V供电的16位移位寄存器？ 请问用4片74LS194A芯片组成的16位双向移位寄存器的逻...
16\u4f4d\u5faa\u73af\u79fb\u4f4d\u5bc4\u5b58\u5668\u8bbe\u8ba1-- 16-bit right shift barrel shifter
-- SEL: in STD_LOGIC_VECTOR(3 downto 0);
-- B_INPUT: in STD_LOGIC_VECTOR(15 downto 0);
-- B_OUTPUT: out STD_LOGIC_VECTOR(15 downto 0);
--**Insert the following between the 'architecture' and
---'begin' keywords**
signal SEL_A, SEL_B: STD_LOGIC_VECTOR(1 downto 0);
signal C: STD_LOGIC_VECTOR(15 downto 0);
--**Insert the following after the 'begin' keyword**
SEL_A <= SEL(1 downto 0);
SEL_B <= SEL(3 downto 2);
process(SEL_A,B_INPUT)
begin
case SEL_A is
when "00" => --shift by 0
C <= B_INPUT;
when "01" => --shift by 1
C(15) <= B_INPUT(0);
C(14 downto 0) <= B_INPUT(15 downto 1);
when "10" => --shift by 2
C(15 downto 14) <= B_INPUT(1 downto 0);
C(13 downto 0) <= B_INPUT(15 downto 2);
when "11" => --shift by 3
C(15 downto 13) <= B_INPUT(2 downto 0);
C(12 downto 0) <= B_INPUT(15 downto 3);
when others =>
C <= B_INPUT;
end case;
end process;
process(SEL_B,C)
begin
case SEL_B is
when "00" => --shift by 0 more
B_OUTPUT <= C;
when "01" => --shift by 4 more
B_OUTPUT(15 downto 12) <= C(3 downto 0);
B_OUTPUT(11 downto 0) <= C(15 downto 4);
when "10" => --shift by 8 more
B_OUTPUT(15 downto 8) <= C(7 downto 0);
B_OUTPUT(7 downto 0) <= C(15 downto 8);
when "11" => --shift by 12 more
B_OUTPUT(15 downto 4) <= C(11 downto 0);
B_OUTPUT(3 downto 0) <= C(15 downto 12);
when others =>
B_OUTPUT <= C;
end case;
end process;
[DISABLELBCODE]
linkin\uff0c\u597d\u50cf\u6211\u6709\u8fd9\u4e2a\u5de5\u7a0b\u56fe\u7eb8\uff0c\u6539\u5929\u6211\u62cd\u4e0b\u6765\u4eceQ\u4e0a\u4f20\u8fc7\u53bb\u7ed9\u4f60\uff0c\u4f60\u81ea\u5df1\u4e0b\u8f7d\u4e2amultisim7\u4eff\u771f\u8f6f\u4ef6\uff0c\u7535\u5b50\u6a21\u62df\u4e00\u4e0b\u5427\uff01
常见的移位寄存器都是八位的，你可以把两片串起来使用。74HC595、74HC595、74HC164、74HC164、74HC165、CD4014、CD4094都可以在3.3V电压下工作。
SN74LS674N 就是16位的，不过有点儿小贵，拆机单位也要8块钱一片。
全新的28元一片。
不过这个是5v的。。。
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