HCT175
28900
SOP/21+
低价出售原装现货可看货假一罚十
HCT175
957
-/9019
公司现货，进口原装热卖
HCT175
45585
SOP16L/1905+
原装正品-正规渠道-增值税票
HCT175
6500
SOP16/2022+
一级代理，原装正品假一罚十价格优势长期供货
HCT175
3850
SOP16S/22+
全新原装只做自己公司现货
HCT175
20856
SOP16/22+
原厂原装现货
HCT175
50
-/-
优价库存
HCT175
2464
SOP16L/98+
-
HCT175
3000
SMD/2019+
原装 部分现货量大期货
HCT175
5060
DIP SOP/21+
原装现货，价钱优惠
HCT175
3000
-/-
-
vhdl的疑问：我按照网上1vhdl范例写了一段代码，却编译不通！！！网上的vhdl范例：library ieee;use ieee.std_logic_1164.all;entity hct175 is port(d : in std_logic_vector(3 downto 0); q : out std_logic_vector(3 downto 0); clrbar, clk : in std_logic);end hct175;architecture ver1 of hct175 isbegin q <= (others => '0') when (clrbar = '0') else d when rising_edge(clk) else unaffected;end ver1;我的vhdl语句如下：library ieee;use ieee.std_logic_1164.all;entity in3of1 is port(clk:in std_logic;
to the 'null' statement in the sequential part of the language. -- the model would work exactly the same without the clause 'else unaffected' attached to the end of the statement. -- uses 1993 std vhdllibrary ieee;use ieee.std_logic_1164.all;entity hct175 is port(d : in std_logic_vector(3 downto 0); q : out std_logic_vector(3 downto 0); clrbar, clk : in std_logic);end hct175;architecture ver1 of hct175 isbegin q <= (others => '0') when (clrbar = '0') else d whe
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