绮惧搧
鎰熻阿涓嬭浇杞?/p>
涓婄瘒
鍩虹鍏冪礌
鐩綍锛?/p>
鏁版嵁绫诲瀷
鏁版嵁瀵硅薄
杩愮畻绗?/p>
璇彞
鍩烘湰绋嬪簭缁撴瀯
鐢佃矾鎻忚堪鏂瑰紡
鏁版嵁绫诲瀷
棰勫畾涔夌被鍨?/p>
bit
bit_victor
integer
std_logic
std_logic_victor
鑷畾涔夌被鍨?/p>
鏋氫妇绫诲瀷
type
鏂版暟鎹被鍨?/p>
is (
鍏冪礌
1,
鍏冪礌
2, ...)
渚?/p>
瀹氫箟
type state_type is (s1, s2, s3. s4);
--
瀹氫箟涓�涓柊绫诲瀷
state_type
寮曠敤
signal state : state_type;
--
瀹氫箟涓�涓俊鍙?/p>
state
锛岀被鍨嬩负
state_type
鏁扮粍绫诲瀷
type
鏁扮粍
is array (
鑼冨洿
) of
鏁版嵁绫诲瀷
;
渚?/p>
瀹氫箟
type byte is array (7 downto 0) of bit;
--
瀹氫箟涓�涓?/p>
8bit
鐨勬暟缁?/p>
type word is array (31 downto 0) of bit;
--
瀹氫箟涓�涓?/p>
32bit
鐨勬暟缁?/p>
鏁版嵁瀵硅薄
绔彛
澹版槑
绔彛
: in | out
鏁版嵁绫诲瀷
;
--
绔彛鍦ㄧ壒鎬т笂绛夊悓浜庝俊鍙凤紝浣嗚祴鍊煎湪
entity
鐨?/p>
port
涓?/p>
璧嬪�?/p>
绔彛
<=
琛ㄨ揪寮?/p>
;
淇″彿
澹版槑
signal
淇″彿
:
鏁版嵁绫诲瀷
;
璧嬪�?/p>
淇″彿
<=
琛ㄨ揪寮?/p>
;
鍙橀噺
澹版槑
varable
鍙橀噺
:
鏁版嵁绫诲瀷
;
璧嬪�?/p>
鍙橀噺
:=
琛ㄨ揪寮?/p>
;
甯告暟
澹版槑
甯告暟
:
鏁版嵁绫诲瀷
:=
鏁板�?/p>
;
杩愮畻绗?/p>
绠楁湳杩愮畻
+, -, *
骞剁疆杩愮畻
&
鍏崇郴杩愮畻
=, /=, <, <=, >, >=
閫昏緫杩愮畻
and, or, not, nand, nor, xor, xnor
璇彞
骞惰璇彞
鈶?/p>
淇″彿璧嬪�艰鍙?/p>
绠�鍗曚俊鍙疯祴鍊艰鍙?/p>
淇″彿
<=
琛ㄨ揪寮?/p>
;
閫夋嫨淇″彿璧嬪�艰鍙?/p>
with
閫夋嫨琛ㄨ揪寮?/p>
select
淇″彿
<=
琛ㄨ揪寮?/p>
1 when
閫夋嫨鍊?/p>
1,