输出是4位的标准逻辑矢量类型
这是个端口声明语句，端口的名称是"M"，端口模式为输出端口，类型是std_logic型的数组，下标的范围是3,2,1,0。这个声明语句声明了一个有4根信号线的输出端口，名称为M，这4根线分别是M(3)、M(2)、M(1)和M(0)。
SIGNAL count1:std_logic_vector (3 DOWNTO 0); D. EGIN E. p1:PROCESS (clk1hz) F. EGIN G. IF (clk1hz'event AND clk1hz='1') THEN IF(count1="1110") THEN count1<="0000"; LSE count1<= ; ā(发现) zhòng(种下) hái(还有)END IF; ND IF; ND PROCESS; p2:PROCESS( ) EGIN ...
datain : In std_logic_vector (3 DownTo 0); dataout : Out std_logic_vector (3 DownTo 0); dsta : InOut std_logic_vector (3 DownTo 0); we : In std_logic; re : In std_logic ); END COMPONENT; SIGNAL clk : std_logic := '0'; SIGNAL datain : std_logic_vector (3 DownTo ...
fen100 library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_library ieee; --库说明use ieee.std_logic_1164.all;--前面这几行,是用的package 即数据库use ieee.std_logic_unsigned.all;-- use ieee.std_logic_arith.all;--entity...
out_en : in std_logic; outer_port : inout std_logic_vector(7 downto 0) ); end bidirection_io; architecture behavioral of bidirection_io is begin outer_port<=inner_port when out_en='1' else (OTHERS=>'Z'); inner_port<=outer_port when out_en='0' else (OTHERS=>'Z'); ...
DDR_ba : inout STD_LOGIC_VECTOR ( 2 downto 0 ); DDR_cas_n : inout STD_LOGIC; DDR_ck_n : inout STD_LOGIC; DDR_ck_p : inout STD_LOGIC; DDR_cke : inout STD_LOGIC; DDR_cs_n : inout STD_LOGIC; DDR_dm : inout STD_LOGIC_...
data_out : out std_logic_vector(7 downto 0) ) end architecture bin2bcd of bin2bcd is begin process(data_in, EN) (signal ) data_in_TEMP : std_logic_vector(2 downto 0) begin data_in_TEMP := data_in( ( 3 ) downto 1) ...
signal abc:std_logic_vector(3 DOWNTO 0);PROCESS(E,D0,D1,D2,D3)BEGINIF E 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 在实体声明之前再加上一句use ieee.std_logic_unsigned.all;将signal abc: std_logic_vector(3 DOWNTO 0);改成variable abc: std_logic_vector(3 ...
signal CR:std_logic_vector(15 downto 0); --计数器寄存器,放置初始值signal CE:std_logic_vector(15 downto 0); --减1计数单元if falling_edge(CLk0) and bz3='1' thenCE 相关知识点: 试题来源: 解析 CE=‘0’&CR(6 TO 0),就是 CR右移1位,高位补0,相当于除以2....